Regarding an LPF at the output of the BBD module, I've tried that,
and exactly like you mentioned, you filter out too many of the
goodies, so it's useless.  It's just a matter of modifying DELAY
CLOCK until it goes away.

--- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@...> wrote:
>
> Hi,
>
> You might need to expand on a the first problem little further.
When
> you say using an envelope as a clock source, presumably you are
> modulating the HSVCO with an envelope, not clocking the BBD with an
> envelope generator?
>
> Regarding the high pitched noise, it sounds like you are describing
> clock noise which is quite normal and does require a LPF to be
placed
> at the output of the BBD module in order to remove it. The obvious
> drawback of this is the potential loss of high end audio
frequencies.
>
> Cheers,
> Adam-V
> --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> <regimental1200@> wrote:
> >
> > I meant 4096 stages, not 2096
> >
> > --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> > <regimental1200@> wrote:
> > >
> > > I get a similar problem all the time!!!!
> > >
> > > Happens on a very intermittant basis.  While using an envelope
as
> > > clock source, I smack a key and can get that typical repeating
and
> > > pitch shifting "Daaaaaaaa-daaaaaaaa-daaaa-da-da-da-da da"
noise,
> > and
> > > then when it feels like it, it stops responding.
> > >
> > > Also, depending on how I have the delay clock knob position,
I'll
> > > get this extremely high resonant noise.  Sometimes it's more
> > subtle
> > > like the frequency it's producing is so high that it's not in
the
> > > audible spectrum, but its enough to hurt my ears.  I fear that
> > I've
> > > even damaged a bit of my high-end with this....
> > >
> > > Is this a defect in the unit, or is that the clock noise that
the
> > > manual talks about generally requiring an LPF?  And if it is,
> > where
> > > exactly should the LPF be inserted?
> > >
> > >
> > > --- In Doepfer_a100@yahoogroups.com, <hardware@> wrote:
> > > >
> > > > > Hi all,
> > > > >
> > > > > My tapped bbd module suddenly has a limited range, it can
now
> > > only
> > > > > do short delaytimes, probably 25-40% of the range it
should
> > > have. In
> > > > > other words: it can't produce the aliasing sound anymore.
The
> > > first
> > > > > time I fired it up it was ok, second time it had this
problem.
> > > Any
> > > > > ideas?
> > > > >
> > > > > greetings, Anton
> > > >
> > > > Sounds like a fault. Probably the "heater" of the
temperature
> > > controlled
> > > > logarithmic converter of the HSVCO is defective. If you are
able
> > > to replace
> > > > an integrated circuit we can send you a new one. As all
circuits
> > > are
> > > > equipped with sockets no soldering is required but only
removing
> > > the old
> > > > circuit and inserting the new one.
> > > >
> > > > Please tell me your postal address (directly to me, not to
the
> > > Yahoo group)
> > > > and we will send you the spare part if you agree. Otherwise
> > please
> > > send the
> > > > module for repair.
> > > >
> > > > Best wishes
> > > > Dieter Doepfer
> > > > (hardware@)
> > > >
> > >
> >
>

Has anyone ever done a side by side comparison of the MS-20 and A-
106?  Putting the oscilators, modular patch bay, and that other filter
section it has for external in processing, I'm looking to downsize and
replace my MS-20.

The joy of BBD delays!

--- In Doepfer_a100@yahoogroups.com, "regimental1200"
<regimental1200@...> wrote:
>
> Regarding an LPF at the output of the BBD module, I've tried that,
> and exactly like you mentioned, you filter out too many of the
> goodies, so it's useless.  It's just a matter of modifying DELAY
> CLOCK until it goes away.
>

Seems a bit strange to me.

I would start from scratch and just patch a VCO into the BBD input and
monitor the BBD output whilst manually tweaking the delay time to
check the basic functionality of the module. Then I would try an LFO
to modulate the delay time to determine that the CV2 input is
functioning correctly. If that works then I would re-try the envelope
generator just to be sure I had actually connected it properly. Then I
would try a different envelope generator or perhaps recheck the
envelope generator settings.

One other thought, the feedback isn't set to a point that the BBD is
self-oscillating is it?

Perhaps one of the other members can offer up further ideas.

Cheers,
Adam-V
--- In Doepfer_a100@yahoogroups.com, "regimental1200"
<regimental1200@...> wrote:
>
> Sorry, I'm at work now and was just not refering to the correct
> jack.  I basically take the output of an envelope and I stick it
> into CV2 of the BBD module.  I also dial-in a bit of feedback.
> Beyond that, only the MIX OUT is connected.
>
>

as said in the BBD manual... when doing clock filtering (LPF at the BBD output)
use the CV
OUT of the BBD to modulate the LPF... Its true that you LOSE a bit of high freq.
(but then
its the point of the operation basically) but it does give GOOD RESULTS...

and I agree with Adam that starting from very basic is a good way to understand
and work
out such module... it took me a bit of time just studying it very closely with
just basic
signal in, cv's, filters before and after... one or two inputs, etc...

same remark with A106 is valid too... as many of the controls really work
together and
gives very different result depending even on the order the parameters are
changed over
time...


if that helps...


Best,

A

--- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@...> wrote:
>
> Seems a bit strange to me.
>
> I would start from scratch and just patch a VCO into the BBD input and
> monitor the BBD output whilst manually tweaking the delay time to
> check the basic functionality of the module. Then I would try an LFO
> to modulate the delay time to determine that the CV2 input is
> functioning correctly. If that works then I would re-try the envelope
> generator just to be sure I had actually connected it properly. Then I
> would try a different envelope generator or perhaps recheck the
> envelope generator settings.
>
> One other thought, the feedback isn't set to a point that the BBD is
> self-oscillating is it?
>
> Perhaps one of the other members can offer up further ideas.
>
> Cheers,
> Adam-V
> --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> <regimental1200@> wrote:
> >
> > Sorry, I'm at work now and was just not refering to the correct
> > jack.  I basically take the output of an envelope and I stick it
> > into CV2 of the BBD module.  I also dial-in a bit of feedback.
> > Beyond that, only the MIX OUT is connected.
> >
> >
>

Hi,

>and exactly like you mentioned, you filter out too many of the
>goodies, so it's useless.

I've had quite good results using a sharp notch filter...

BTW, I don't suppose anyone has access to more than a few of the BBD
modules, but I wonder if anyone could tell me which of the modules provides
the best 'bit crunching' effect.  I have a 256 stage BBD and it's pretty
good for this but I was wondering whether one of the longer staged chips
might not produce a wider range or more extreme effect.

thanks,

Pierre

_________________________________________________________________
Customise your home page with RSS feeds - visit MSN SA today!
http://za.msn.com/

hello,
yes, but Anton meant the a188-2 tapped bbd module.
so, it seems that his problem is not the same as in
your module. Anton probably has a defective unit that
needs repair. (as indicated by Dieter.)
as for your unit, i also have the 4096 bbd module and
have not noticed any wierd behaviour in mine...
but, maybe, all you have to do is filter the clock
noise? for this, just insert a steep slope LPF module
before the bbd module's audio input and after the bbd
module's audio output.
best regards,
Bakis.


--- regimental1200 <regimental1200@...> wrote:

> I meant 4096 stages, not 2096
>
> --- In Doepfer_a100@yahoogroups.com,
> "regimental1200"
> <regimental1200@...> wrote:
> >
> > I get a similar problem all the time!!!!
> >
> > Happens on a very intermittant basis.  While using
> an envelope as
> > clock source, I smack a key and can get that
> typical repeating and
> > pitch shifting
> "Daaaaaaaa-daaaaaaaa-daaaa-da-da-da-da da" noise,
> and
> > then when it feels like it, it stops responding.
> >
> > Also, depending on how I have the delay clock knob
> position, I'll
> > get this extremely high resonant noise.  Sometimes
> it's more
> subtle
> > like the frequency it's producing is so high that
> it's not in the
> > audible spectrum, but its enough to hurt my ears.
> I fear that
> I've
> > even damaged a bit of my high-end with this....
> >
> > Is this a defect in the unit, or is that the clock
> noise that the
> > manual talks about generally requiring an LPF?
> And if it is,
> where
> > exactly should the LPF be inserted?
> >
> >
> > --- In Doepfer_a100@yahoogroups.com, <hardware@>
> wrote:
> > >
> > > > Hi all,
> > > >
> > > > My tapped bbd module suddenly has a limited
> range, it can now
> > only
> > > > do short delaytimes, probably 25-40% of the
> range it should
> > have. In
> > > > other words: it can't produce the aliasing
> sound anymore. The
> > first
> > > > time I fired it up it was ok, second time it
> had this problem.
> > Any
> > > > ideas?
> > > >
> > > > greetings, Anton
> > >
> > > Sounds like a fault. Probably the "heater" of
> the temperature
> > controlled
> > > logarithmic converter of the HSVCO is defective.
> If you are able
> > to replace
> > > an integrated circuit we can send you a new one.
> As all circuits
> > are
> > > equipped with sockets no soldering is required
> but only removing
> > the old
> > > circuit and inserting the new one.
> > >
> > > Please tell me your postal address (directly to
> me, not to the
> > Yahoo group)
> > > and we will send you the spare part if you
> agree. Otherwise
> please
> > send the
> > > module for repair.
> > >
> > > Best wishes
> > > Dieter Doepfer
> > > (hardware@)
> > >
> >
>
>
>


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

Hi Pierre

> BTW, I don't suppose anyone has access to more than a few of the BBD
> modules,
Dieter will be happy about each module, we buy ;-)))


> but I wonder if anyone could tell me which of the modules provides
> the best 'bit crunching' effect.  I have a 256 stage BBD and it's pretty
> good for this but I was wondering whether one of the longer staged chips
> might not produce a wider range or more extreme effect.
I think you are looking for a kind of "intended reduction of signal
quality". There is no real bit crunching with a BBD Module. But there
are some side effects which you may want to use:

The first is caused by the sample&hold stage of the BBD with lower clock
rates (funny sounds happen, if the audio contains signals one octave
below and above the clockrate).
If you want to achieve this effect, then the answer already is given
with this explanation: the best module for "bit crunching" might be not
a BBD, but a simple S&H module. Feed it the audio signal through the S&H
and use a high tuned VCO or fast LFO as clock source.


The second side effect: with long delaytimes the analogue storage stages
(in principle: capacitors) loose content. This changes of course the
sound, because the waveform is changed.
This effect will happen in general with every BBD, but assumingly it
will be heavier at BBDs with more stages, because the 'capacitors' have
to be mechanically smaller.

Florian

--- In Doepfer_a100@yahoogroups.com, "regimental1200"
<regimental1200@...> wrote:
>
> Has anyone ever done a side by side comparison of the MS-20 and A-
> 106?  Putting the oscilators, modular patch bay, and that other
filter
> section it has for external in processing, I'm looking to downsize
and
> replace my MS-20.
>

yes, i have done that and i would say that you better should
keep your ms20. imho the a106/1 comes quite close to an ms20 filter,
but thats really hard to prove, because almost all original
ms20's sound a bit (and sometimes more than just a bit) different.
ms20's in good condition are really rare. if you don't need the
money badly you should keep the ms20, because you probably won't
have the chance to buy one in a few years.

best wishes

ingo

i would start testing without using a modulator and only with
a very simple input signal (a single vco wave).

first reduce the feedback to zero.
dial in a very short delay time and you should not hear
any clock noise coming through. then decrease the delay time
manually and write down the knob setting when the clock noise
gets audible (knob should be around 12 o'clock position).
if you get a different result then please post your
knob setting here.

after that you should try a slow modulator (f.e. an lfo)
as adviced by adam-v.
one important point regarding envelopes, some env modules
spill out up to +10 volts, so sometimes it is necessary to
attenuate the envelope signal, otherwise the hsvco may
reach frequencies where the bbd chip starts doing strange things.
this is of course also depending on the type of bbd chip,
not all chips show the same reactions.

if you want to filter out the clock noise, then use the
cv output of the bbd module and feed it into the cv input of a
lowpass filter. feed the bbd output into the filter input and use
the filter output as your new delayed signal. use the steepest
lowpass filter that you have in your system. the steeper the
filter the more high fequencies are left in the signal.
if you want to get more clean results, then you can use
another lowpass in the same manner to filter the bbd input signal.
this reduces aliasing noises, but has nothing to do with the
clock noise.

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@...> wrote:
>
> Seems a bit strange to me.
>
> I would start from scratch and just patch a VCO into the BBD input
and
> monitor the BBD output whilst manually tweaking the delay time to
> check the basic functionality of the module. Then I would try an LFO
> to modulate the delay time to determine that the CV2 input is
> functioning correctly. If that works then I would re-try the
envelope
> generator just to be sure I had actually connected it properly.
Then I
> would try a different envelope generator or perhaps recheck the
> envelope generator settings.
>
> One other thought, the feedback isn't set to a point that the BBD
is
> self-oscillating is it?
>
> Perhaps one of the other members can offer up further ideas.
>
> Cheers,
> Adam-V
> --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> <regimental1200@> wrote:
> >
> > Sorry, I'm at work now and was just not refering to the correct
> > jack.  I basically take the output of an envelope and I stick it
> > into CV2 of the BBD module.  I also dial-in a bit of feedback.
> > Beyond that, only the MIX OUT is connected.
> >
> >
>

Ingo is right. keep your MS20.
best regards,
Bakis.


--- selfoscillate <synaptic_music@...> wrote:

> --- In Doepfer_a100@yahoogroups.com,
> "regimental1200"
> <regimental1200@...> wrote:
> >
> > Has anyone ever done a side by side comparison of
> the MS-20 and A-
> > 106?  Putting the oscilators, modular patch bay,
> and that other
> filter
> > section it has for external in processing, I'm
> looking to downsize
> and
> > replace my MS-20.
> >
>
> yes, i have done that and i would say that you
> better should
> keep your ms20. imho the a106/1 comes quite close to
> an ms20 filter,
> but thats really hard to prove, because almost all
> original
> ms20's sound a bit (and sometimes more than just a
> bit) different.
> ms20's in good condition are really rare. if you
> don't need the
> money badly you should keep the ms20, because you
> probably won't
> have the chance to buy one in a few years.
>
> best wishes
>
> ingo
>
>
>
>
>


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
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If you modulate the CV input of the VCF (which you placed after the
BBD) with an EG or envelope follower, it is possible to keep the
characteristic BBD sound for exactly the time desired, after which the
clock is slowly filtered out entirely in the time set by the "release"
control of the EG.
This way, you can use the VCF as a kind of 'noise'(clock) gate for
your bbd.

Hope this helps, regards
Joost


--- In Doepfer_a100@yahoogroups.com, "regimental1200"
<regimental1200@...> wrote:
>
> Regarding an LPF at the output of the BBD module, I've tried that,
> and exactly like you mentioned, you filter out too many of the
> goodies, so it's useless.  It's just a matter of modifying DELAY
> CLOCK until it goes away.
>
> --- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@> wrote:
> >
> > Hi,
> >
> > You might need to expand on a the first problem little further.
> When
> > you say using an envelope as a clock source, presumably you are
> > modulating the HSVCO with an envelope, not clocking the BBD with an
> > envelope generator?
> >
> > Regarding the high pitched noise, it sounds like you are describing
> > clock noise which is quite normal and does require a LPF to be
> placed
> > at the output of the BBD module in order to remove it. The obvious
> > drawback of this is the potential loss of high end audio
> frequencies.
> >
> > Cheers,
> > Adam-V
> > --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> > <regimental1200@> wrote:
> > >
> > > I meant 4096 stages, not 2096
> > >
> > > --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> > > <regimental1200@> wrote:
> > > >
> > > > I get a similar problem all the time!!!!
> > > >
> > > > Happens on a very intermittant basis.  While using an envelope
> as
> > > > clock source, I smack a key and can get that typical repeating
> and
> > > > pitch shifting "Daaaaaaaa-daaaaaaaa-daaaa-da-da-da-da da"
> noise,
> > > and
> > > > then when it feels like it, it stops responding.
> > > >
> > > > Also, depending on how I have the delay clock knob position,
> I'll
> > > > get this extremely high resonant noise.  Sometimes it's more
> > > subtle
> > > > like the frequency it's producing is so high that it's not in
> the
> > > > audible spectrum, but its enough to hurt my ears.  I fear that
> > > I've
> > > > even damaged a bit of my high-end with this....
> > > >
> > > > Is this a defect in the unit, or is that the clock noise that
> the
> > > > manual talks about generally requiring an LPF?  And if it is,
> > > where
> > > > exactly should the LPF be inserted?
> > > >
> > > >
> > > > --- In Doepfer_a100@yahoogroups.com, <hardware@> wrote:
> > > > >
> > > > > > Hi all,
> > > > > >
> > > > > > My tapped bbd module suddenly has a limited range, it can
> now
> > > > only
> > > > > > do short delaytimes, probably 25-40% of the range it
> should
> > > > have. In
> > > > > > other words: it can't produce the aliasing sound anymore.
> The
> > > > first
> > > > > > time I fired it up it was ok, second time it had this
> problem.
> > > > Any
> > > > > > ideas?
> > > > > >
> > > > > > greetings, Anton
> > > > >
> > > > > Sounds like a fault. Probably the "heater" of the
> temperature
> > > > controlled
> > > > > logarithmic converter of the HSVCO is defective. If you are
> able
> > > > to replace
> > > > > an integrated circuit we can send you a new one. As all
> circuits
> > > > are
> > > > > equipped with sockets no soldering is required but only
> removing
> > > > the old
> > > > > circuit and inserting the new one.
> > > > >
> > > > > Please tell me your postal address (directly to me, not to
> the
> > > > Yahoo group)
> > > > > and we will send you the spare part if you agree. Otherwise
> > > please
> > > > send the
> > > > > module for repair.
> > > > >
> > > > > Best wishes
> > > > > Dieter Doepfer
> > > > > (hardware@)
> > > > >
> > > >
> > >
> >
>

Hi, I'm new to the group and have set my A100 to operation for the first time a
few days ago. I have one question concerning the high end VCO A-111. When I
modulate the PCV-Input with an LFO and turn the PCV knob clockwise, there is
also a weak FM in all signal outputs, bad enough not to use PWM.

Is this a fault in my VCO, and is there any solution for it?

Best regards, Markus

[Non-text portions of this message have been removed]

I'll try to run those basic tests.  I'll also try different patch
cables in case it's a matter of bad connectors; sometimes I can't get
a response somewhere in the system and by nudging the cable, it then
works.

As for the feedback, I have already eliminated that because the same
intermittant problem was occuring with no feedback.

--- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@...> wrote:
>
> Seems a bit strange to me.
>
> I would start from scratch and just patch a VCO into the BBD input
and
> monitor the BBD output whilst manually tweaking the delay time to
> check the basic functionality of the module. Then I would try an LFO
> to modulate the delay time to determine that the CV2 input is
> functioning correctly. If that works then I would re-try the
envelope
> generator just to be sure I had actually connected it properly.
Then I
> would try a different envelope generator or perhaps recheck the
> envelope generator settings.
>
> One other thought, the feedback isn't set to a point that the BBD
is
> self-oscillating is it?
>
> Perhaps one of the other members can offer up further ideas.
>
> Cheers,
> Adam-V
> --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> <regimental1200@> wrote:
> >
> > Sorry, I'm at work now and was just not refering to the correct
> > jack.  I basically take the output of an envelope and I stick it
> > into CV2 of the BBD module.  I also dial-in a bit of feedback.
> > Beyond that, only the MIX OUT is connected.
> >
> >
>

If memory serves me well, I followed the manual one time and used its
CV output to control an LPF...forget if it gave me the result i
wanted.  I'll try again and see if there's a difference from having
the filter controlled by a seperate envelope.  Thanks!

--- In Doepfer_a100@yahoogroups.com, "bellenger_a" <bellenger_a@...>
wrote:
>
> as said in the BBD manual... when doing clock filtering (LPF at the
BBD output) use the CV
> OUT of the BBD to modulate the LPF... Its true that you LOSE a bit
of high freq. (but then
> its the point of the operation basically) but it does give GOOD
RESULTS...
>
> and I agree with Adam that starting from very basic is a good way
to understand and work
> out such module... it took me a bit of time just studying it very
closely with just basic
> signal in, cv's, filters before and after... one or two inputs,
etc...
>
> same remark with A106 is valid too... as many of the controls
really work together and
> gives very different result depending even on the order the
parameters are changed over
> time...
>
>
> if that helps...
>
>
> Best,
>
> A
>
> --- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@> wrote:
> >
> > Seems a bit strange to me.
> >
> > I would start from scratch and just patch a VCO into the BBD
input and
> > monitor the BBD output whilst manually tweaking the delay time to
> > check the basic functionality of the module. Then I would try an
LFO
> > to modulate the delay time to determine that the CV2 input is
> > functioning correctly. If that works then I would re-try the
envelope
> > generator just to be sure I had actually connected it properly.
Then I
> > would try a different envelope generator or perhaps recheck the
> > envelope generator settings.
> >
> > One other thought, the feedback isn't set to a point that the BBD
is
> > self-oscillating is it?
> >
> > Perhaps one of the other members can offer up further ideas.
> >
> > Cheers,
> > Adam-V
> > --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> > <regimental1200@> wrote:
> > >
> > > Sorry, I'm at work now and was just not refering to the correct
> > > jack.  I basically take the output of an envelope and I stick
it
> > > into CV2 of the BBD module.  I also dial-in a bit of feedback.
> > > Beyond that, only the MIX OUT is connected.
> > >
> > >
> >
>

I guess I won't risk it and just keep the original.  I probably have
one of the best condition MS-20s left in the world.  Paid a pretty
penny for it a couple of years ago, but it basically looked like it
came out from the box.  It would be good enough for the Pope.

I'd still like to try the A-106, but I refuse to visit my local
dealer anymore as he's turned into a real ass.  I hate him so much
that I prefer to buy from Analogue Haven and suffer with duties and
taxes.

--- In Doepfer_a100@yahoogroups.com, "selfoscillate"
<synaptic_music@...> wrote:
>
> --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> <regimental1200@> wrote:
> >
> > Has anyone ever done a side by side comparison of the MS-20 and A-
> > 106?  Putting the oscilators, modular patch bay, and that other
> filter
> > section it has for external in processing, I'm looking to
downsize
> and
> > replace my MS-20.
> >
>
> yes, i have done that and i would say that you better should
> keep your ms20. imho the a106/1 comes quite close to an ms20 filter,
> but thats really hard to prove, because almost all original
> ms20's sound a bit (and sometimes more than just a bit) different.
> ms20's in good condition are really rare. if you don't need the
> money badly you should keep the ms20, because you probably won't
> have the chance to buy one in a few years.
>
> best wishes
>
> ingo
>

hello,
i had the same problem with a few of my a111's.
just plug a minijack cable into the hard sync input.
leave it there and then i think the problem will
dissapear. it is a problem with the hard sync input
minijack socket... you can permanently correct this
problem (so you don't have to leave plugged a cable to
the hardsync socket all the time...), i guess, with
the instructions that are present in the doepfer
website in the faq page. there is some touching of the
metal plates going on inside the minijack socket. i do
not exactly remember how i corrected this, but i think
that was the procedure described in the doepfer faq
page.
tell me if pluggin a cable into the hard sync input
corrected your problem first, though.
best regards,
Bakis.




--- Markus Grieß <markus.griess@...> wrote:

> Hi, I'm new to the group and have set my A100 to
> operation for the first time a few days ago. I have
> one question concerning the high end VCO A-111. When
> I modulate the PCV-Input with an LFO and turn the
> PCV knob clockwise, there is also a weak FM in all
> signal outputs, bad enough not to use PWM.
>
> Is this a fault in my VCO, and is there any solution
> for it?
>
> Best regards, Markus
>
> [Non-text portions of this message have been
> removed]
>
>


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

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Hi;

For sale A-100G6  Big case rack , PS1  near mint condiction.. 0 gigs.. just
a few hours use

220 euros

Located in Spain

Happy 2007

Hans

_________________________________________________________________
Un amor, una aventura, compañía para un viaje. Regístrate gratis en MSN Amor
& Amistad. http://match.msn.es/match/mt.cfm?pg=channel&tcid=162349

Hello Bakis,



thanks for your response. Plugging a cable into the hard sync input (or any
other jack) did not fix the problem. I also tried a shorted plug in the CV1
input as I supposed crosstalk, without success (I’m not sure whether the
sensitive CV1 input is shorted to 0V when no plug is inserted and I do not
have schematics of the A111).



I didn’t find any hint at the Doepfer page. Any other idea?



Best regards,

Markus



   _____

Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] Im
Auftrag von Bakis Sirros
Gesendet: Freitag, 29. Dezember 2006 23:50
An: Doepfer_a100@yahoogroups.com
Betreff: Re: [Doepfer_a100] PWM with A-111



hello,
i had the same problem with a few of my a111's.
just plug a minijack cable into the hard sync input.
leave it there and then i think the problem will
dissapear. it is a problem with the hard sync input
minijack socket... you can permanently correct this
problem (so you don't have to leave plugged a cable to
the hardsync socket all the time...), i guess, with
the instructions that are present in the doepfer
website in the faq page. there is some touching of the
metal plates going on inside the minijack socket. i do
not exactly remember how i corrected this, but i think
that was the procedure described in the doepfer faq
page.
tell me if pluggin a cable into the hard sync input
corrected your problem first, though.
best regards,
Bakis.

--- Markus Grieß <markus.griess@ <mailto:markus.griess%40gmx.net> gmx.net>
wrote:

> Hi, I'm new to the group and have set my A100 to
> operation for the first time a few days ago. I have
> one question concerning the high end VCO A-111. When
> I modulate the PCV-Input with an LFO and turn the
> PCV knob clockwise, there is also a weak FM in all
> signal outputs, bad enough not to use PWM.
>
> Is this a fault in my VCO, and is there any solution
> for it?
>
> Best regards, Markus
>
> [Non-text portions of this message have been
> removed]
>
>

Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel <http://www.parallel-worlds-music.com> -worlds-music.com
http://www.myspace. <http://www.myspace.com/parallelworldsmusic>
com/parallelworldsmusic
http://www.shimarec <http://www.shimarecords.co.uk> ords.co.uk
http://www.rubber. <http://www.rubber.gr> gr
Athens-Greece

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[Non-text portions of this message have been removed]

hi Markus

> Hi, I'm new to the group and have set my A100 to operation for the first
> time a few days ago. I have one question concerning the high end
> VCO A-111. When I modulate the PCV-Input with an LFO and turn the
> PCV knob clockwise, there is also a weak FM in all signal outputs,
> bad enough not to use PWM.
Pay attention: the faster the PWM, the more it will sound like pitch
modulation. For our ear a width modulated pulsewave is not one up and
one down movement but two peaks, where one is frequency modulated[*]. If
the FM seems to get weaker with slower LFO frequencies, then your A-111
is not buggy but you discovered a nice psychoacoustical phenomenon.

As rule of thumb you can say: the faster the modulating frequency is,
the smaller the modulation amount should be


Florian

[*] you can test this by sending a pulswave through a unmodulatied
phaseshifter and listening only to the effectsignal and then listen only
to the original signal (no mix) you won't hear a difference.
If you have a look at an oscilloscope (or wave edit window of a digitla
recording tool), you will see that the waveforms look completely different.

hi Markus

> Hi, I'm new to the group and have set my A100 to operation for the first
> time a few days ago. I have one question concerning the high end
> VCO A-111. When I modulate the PCV-Input with an LFO and turn the
> PCV knob clockwise, there is also a weak FM in all signal outputs,
> bad enough not to use PWM.
Pay attention: the faster the PWM, the more it will sound like pitch
modulation. For our ear a width modulated pulsewave is not one up and
one down movement but two peaks, where one is frequency modulated[*]. If
the FM seems to get weaker with slower LFO frequencies, then your A-111
is not buggy but you discovered a nice psychoacoustical phenomenon.

As rule of thumb you can say: the faster the modulating frequency is,
the smaller the modulation amount should be


Florian

[*] you can test this by sending a pulswave through a unmodulatied
phaseshifter and listening only to the effectsignal and then listen only
to the original signal (no mix) you won't hear a difference.
If you have a look at an oscilloscope (or wave edit window of a digitla
recording tool), you will see that the waveforms look completely different.

Hi Markus,

> I didn't find any hint at the Doepfer page. Any other idea?

After checking some of the history on this problem, I realised I too
had this problem when I first got my A-111 (over 4 years ago), and
the solution then, by EMIS the UK distributor, was to replace the
CEM3340 chip. In an old email I had written to Dieter at the time, I
mentioned that specifically grounding the hard sync input did *not*
cure the problem!

However, checking past messages, the last time this appeared seems to
have been post #9193, about a year ago: one of the follow-up posts,
#9203, contained the suggestion from Dieter about grounding the hard-
sync input, but checking my module against what he says doesn't make
sense, as the switched contact on mine is *not* grounded (but I'm
guessing on new modules they solder across the gap). Hence I suggest
the following:

Insert a patch lead into the hard sync socket, and *deliberately
ground the tip at the other end*.

If this cures it, have a look at the switched contacts on the hard
sync socket - these are the two on the very end of the board. I
suspect that they are bridged with solder: if they are, then probably
a new socket is needed; if they are not, then bridging them with
solder will have the effect of always grounding the hard sync line
when no plug is inserted, which hopefully should then give a
permanent solution.

If inserting and grounding the lead doesn't totally remove the
problem, then I suspect you'll need a new chip as I did!

Tim

Hi Tim,

> If inserting and grounding the lead doesn't totally remove the
> problem, then I suspect you'll need a new chip as I did!

thanks for your help. I found out that the connections an the
sockets/switches are ok; so the CEM3340 seems to be faulty. Since the
rest seems to be working well, I will not replace the CEM but add a
comparator for the PW/PWM instead, like in the A-110.

Best regards,
Markus

hello,
the problem thast mark describes is that he hears a
bit of FM when listening to other wevforms of the a111
while an lfo modulates the PW of the PWM input.
i suspect maybe the cem3340 is defective...?
is that a new a111 module?
best regards,     :-)
Bakis.



--- Florian Anwander <Florian.Anwander@...>
wrote:

> hi Markus
>
> > Hi, I'm new to the group and have set my A100 to
> operation for the first
> > time a few days ago. I have one question
> concerning the high end
> > VCO A-111. When I modulate the PCV-Input with an
> LFO and turn the
> > PCV knob clockwise, there is also a weak FM in all
> signal outputs,
> > bad enough not to use PWM.
> Pay attention: the faster the PWM, the more it will
> sound like pitch
> modulation. For our ear a width modulated pulsewave
> is not one up and
> one down movement but two peaks, where one is
> frequency modulated[*]. If
> the FM seems to get weaker with slower LFO
> frequencies, then your A-111
> is not buggy but you discovered a nice
> psychoacoustical phenomenon.
>
> As rule of thumb you can say: the faster the
> modulating frequency is,
> the smaller the modulation amount should be
>
>
> Florian
>
> [*] you can test this by sending a pulswave through
> a unmodulatied
> phaseshifter and listening only to the effectsignal
> and then listen only
> to the original signal (no mix) you won't hear a
> difference.
> If you have a look at an oscilloscope (or wave edit
> window of a digitla
> recording tool), you will see that the waveforms
> look completely different.
>


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

__________________________________________________
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hello again,
if i remember right:
out of the 8 a111's i have,
one of my a111's had the exact same problem with the
PWM input and it turned out that its CEM3340 needed a
replacement(wich doepfer replaced and the module
worked fine afterwards).
then, after some months, two of my other a111's had
the exact same PWM problem and, by just plugging a
cable into the hard sync input and then adjusting the
metal plates of the hardsync input socket, fixed the
problem entirely!
so, it seeems that this PWM symptom has two different
causes...
at least that is my experience so far.
best regards,    :-)
Bakis.


--- Tim Stinchcombe
<timothy@...> wrote:

> Hi Markus,
>
> > I didn't find any hint at the Doepfer page. Any
> other idea?
>
> After checking some of the history on this problem,
> I realised I too
> had this problem when I first got my A-111 (over 4
> years ago), and
> the solution then, by EMIS the UK distributor, was
> to replace the
> CEM3340 chip. In an old email I had written to
> Dieter at the time, I
> mentioned that specifically grounding the hard sync
> input did *not*
> cure the problem!
>
> However, checking past messages, the last time this
> appeared seems to
> have been post #9193, about a year ago: one of the
> follow-up posts,
> #9203, contained the suggestion from Dieter about
> grounding the hard-
> sync input, but checking my module against what he
> says doesn't make
> sense, as the switched contact on mine is *not*
> grounded (but I'm
> guessing on new modules they solder across the gap).
> Hence I suggest
> the following:
>
> Insert a patch lead into the hard sync socket, and
> *deliberately
> ground the tip at the other end*.
>
> If this cures it, have a look at the switched
> contacts on the hard
> sync socket - these are the two on the very end of
> the board. I
> suspect that they are bridged with solder: if they
> are, then probably
> a new socket is needed; if they are not, then
> bridging them with
> solder will have the effect of always grounding the
> hard sync line
> when no plug is inserted, which hopefully should
> then give a
> permanent solution.
>
> If inserting and grounding the lead doesn't totally
> remove the
> problem, then I suspect you'll need a new chip as I
> did!
>
> Tim
>
>
>
>
>
>


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

__________________________________________________
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I have also something with my A111... it doesnt work with A163. When I plug
square wave
into the A163... it works for 5 seconds then nothing. But the A163 worksok with
A110 or
A196.

Can I do something to sort this out?


Best,


Alexandre

bellenger_a wrote:
> I have also something with my A111... it doesnt work with A163. When I plug
square wave
> into the A163... it works for 5 seconds then nothing. But the A163 worksok
with A110 or
> A196.
>
> Can I do something to sort this out?


"> I checked the A-163 with an A-111. A 47k resistor between the clock
input of
  > the A-163 and GND solves the problem.
  >
  > Best wishes
  > Dieter Doepfer"

hello again,
well, IIRC, this problem's differential diagnosis is:
if the specific PWM problem appears alone, chances are
that the cause is a defective CEM3340 chip.
if this specific PWM problem appears together with
another problem-that being the vco not sounding
correctly in the higher registers, then chances are
that the cause is the hardsync input socket.
best regards,
Bakis.



--- Bakis Sirros <synth_freak_2000@...> wrote:

> hello again,
> if i remember right:
> out of the 8 a111's i have,
> one of my a111's had the exact same problem with the
> PWM input and it turned out that its CEM3340 needed
> a
> replacement(wich doepfer replaced and the module
> worked fine afterwards).
> then, after some months, two of my other a111's had
> the exact same PWM problem and, by just plugging a
> cable into the hard sync input and then adjusting
> the
> metal plates of the hardsync input socket, fixed the
> problem entirely!
> so, it seeems that this PWM symptom has two
> different
> causes...
> at least that is my experience so far.
> best regards,    :-)
> Bakis.
>
>
> --- Tim Stinchcombe
> <timothy@...> wrote:
>
> > Hi Markus,
> >
> > > I didn't find any hint at the Doepfer page. Any
> > other idea?
> >
> > After checking some of the history on this
> problem,
> > I realised I too
> > had this problem when I first got my A-111 (over 4
> > years ago), and
> > the solution then, by EMIS the UK distributor, was
> > to replace the
> > CEM3340 chip. In an old email I had written to
> > Dieter at the time, I
> > mentioned that specifically grounding the hard
> sync
> > input did *not*
> > cure the problem!
> >
> > However, checking past messages, the last time
> this
> > appeared seems to
> > have been post #9193, about a year ago: one of the
> > follow-up posts,
> > #9203, contained the suggestion from Dieter about
> > grounding the hard-
> > sync input, but checking my module against what he
> > says doesn't make
> > sense, as the switched contact on mine is *not*
> > grounded (but I'm
> > guessing on new modules they solder across the
> gap).
> > Hence I suggest
> > the following:
> >
> > Insert a patch lead into the hard sync socket, and
> > *deliberately
> > ground the tip at the other end*.
> >
> > If this cures it, have a look at the switched
> > contacts on the hard
> > sync socket - these are the two on the very end of
> > the board. I
> > suspect that they are bridged with solder: if they
> > are, then probably
> > a new socket is needed; if they are not, then
> > bridging them with
> > solder will have the effect of always grounding
> the
> > hard sync line
> > when no plug is inserted, which hopefully should
> > then give a
> > permanent solution.
> >
> > If inserting and grounding the lead doesn't
> totally
> > remove the
> > problem, then I suspect you'll need a new chip as
> I
> > did!
> >
> > Tim
> >
> >
> >
> >
> >
> >
>
>
> Bakis Sirros - Parallel Worlds
> [Doepfer_a100] group owner
> http://www.parallel-worlds-music.com
> http://www.myspace.com/parallelworldsmusic
> http://www.shimarecords.co.uk
> http://www.rubber.gr
> Athens-Greece
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam
> protection around
> http://mail.yahoo.com
>


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

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The following Doepfer_a100 poll is now closed.  Here are the
final results:


POLL QUESTION: Would you like Doepfer to include 4 VCA's in the 4 LFO outputs of
the A143-9 module?
(this could be realized in two ways: four attenuator pots and four level-VC
inputs, one for each LFO out, or, one common attenuator pot acting on all 4 LFO
outputs plus one common level-VC input acting on all 4 LFO outputs.
these extra features will almost double the price of the module though.)

CHOICES AND RESULTS
- Yes!, 2 votes, 66.67%
- maybe..., 1 votes, 33.33%
- No., 0 votes, 0.00%



For more information about this group, please visit
http://groups.yahoo.com/group/Doepfer_a100

For help with Yahoo! Groups, please visit
http://help.yahoo.com/help/us/groups/

The following Doepfer_a100 poll is now closed.  Here are the
final results:


POLL QUESTION: Would you like Doepfer to release a Wheel module? possible
features would/could be something like this: "A panel with two standard mod
wheels would be very nice to compliment
  this and other modules. One wheel could be the standard mod function
  with a low-to-high output voltage and the other would be the standard
  pitch bend configuration with bipolar CV out. A removable spring
  return or just a heavy center detent would be great. Just mounted in
  a panel with the output jacks at the top and your ready to go (range
  adjustment could be at the receiving module). As a added cool factor
  - if the wheels were clear plexiglass - sidelight them with a blue
  led. VERY cool looking. Even better would be a blue/red or other
  combo that would change through the color spectrum as the wheel was
  moved."

CHOICES AND RESULTS
- Yes!, 10 votes, 47.62%
- maybe..., 3 votes, 14.29%
- No., 8 votes, 38.10%



For more information about this group, please visit
http://groups.yahoo.com/group/Doepfer_a100

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