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A-127 as triple LFO?   Message List  
Reply Message #17942 of 23549 |
Re: AW: [Doepfer_a100] a-112 - cv recording?

Hey Dieter, we talked about this before, I just dug up the post, here it
is below.

"The input of the A-112 is already DC coupled. For DC coupling of the output
one has to short the 100nF capacitor C11. From the schematics I'd expect a
negative DC offset of about -2.5V and an inverted output as the current
output of the DAC is converted into a voltage by an opamp inverter without
input resistor. You will have to add another inverter (e.g. A-175 or A-138c)
to obtain a non-inverted signal and a positive (or with A-138c adjustable)
offset.

Best wishes
Dieter Doepfer"

Sounds as though A-112 + A-138C might be the winning combination for the
original poster. He probably already has A-138C...

Tony

yahoo@... wrote:
>
> The A-112 can be modified very easily for DC coupling: short capacitor C11
> (100nF, next to the TL064).
>
> Best wishes
> Dieter Doepfer
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> <mailto:Doepfer_a100%40yahoogroups.com>
> > [mailto:Doepfer_a100@yahoogroups.com
> <mailto:Doepfer_a100%40yahoogroups.com>]Im Auftrag von brian
> > Gesendet: Donnerstag, 22. Januar 2009 22:26
> > An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com>
> > Betreff: Re: [Doepfer_a100] a-112 - cv recording?
> >
> >
> > Hello,
> >
> > I am a very new user to the euro world and have a couple modules
> > so far but recently got an A-112 second hand. My time with it
> > has only been about 1 hour so far but was wondering if it is
> > possible to record CV data as opposed to audio. It seems like I
> > was able to get quick swells from a slew-as-envelope but when I
> > slowed the timing down it didn't seem to work. I am currently
> > waiting on some proper lfo/adsr to fully test it but wanted to
> > see if any of you have any info. Likewise, if it is not set-up
> > to do so currently is there a possible mod to allow CV recording?
> >
> > Thanks,
> > b.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>
>




Fri Jan 23, 2009 12:56 pm

makenoisemusic
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Message #17942 of 23549 |
Expand Messages Author Sort by Date

... Sometimes there are internal voltage offsets that cannot be avoided or only with additional efforts (e.g. the famous Moog filter circuit and all derivates...
yahoo@...
ddoepfer Offline Send Email
Jan 23, 2009
1:21 pm

Hey Dieter, we talked about this before, I just dug up the post, here it is below. "The input of the A-112 is already DC coupled. For DC coupling of the output...
Tony Rolando
makenoisemusic Offline Send Email
Jan 23, 2009
12:56 pm

If you are using your modular with midi you could use the a192 module to record the cv's to your computer and recall when needed. ... far but recently got an...
jmaddocks1975 Offline Send Email Jan 26, 2009
5:24 pm

I wish the A-192 were that easy to use. I have one, I only use it with Max/MSP since i have a "sensor" reading patch. The A-192 only accepts positive...
Don Kim
dkimcg Offline Send Email
Jan 26, 2009
10:37 pm

Hello Don, The proposed OSC device is not necessery. Something like that already exists! Check out what the people at Sonology developed, they sell this as a...
achtung_999 Offline Send Email Jan 26, 2009
11:03 pm

No, not really, 0V to +5V is not adequate for CV, and a sample rate of 1KHz is far from sufficient. _g ... [Non-text portions of this message have been...
Guy Drieghe D.
gddfp Offline Send Email
Jan 26, 2009
11:10 pm

Yes, there were some more issues.. I was a bit quick sorry about that.But about the 0-5v: come on people.. haven't you heard about shifting the CV upwards?? ...
achtung_999 Offline Send Email Jan 26, 2009
11:13 pm

You'll need at least -5V to +5V for proper CV handling in a modular; probably even more. It's especially the through-zero portion that is important... But the...
Guy Drieghe D.
gddfp Offline Send Email
Jan 26, 2009
11:17 pm

I agree on the sampling rate. But let's not forget that these boards are made for bodily controllers. You would agree that 1 KHZ is enough for tracking human...
achtung_999 Offline Send Email Jan 26, 2009
11:35 pm

Not for tracking faster movement. Motion Capture systems run quite a bit higher than 1Khz. Besides, I'd rather stop spending time trying to make systems, and ...
Don Kim
dkimcg Offline Send Email
Jan 26, 2009
11:45 pm

... Yes, I saw that, and was actually wondering what these then had to do with CV writing (and reading), as mentioned in the post you replied to. There are...
Guy Drieghe D.
gddfp Offline Send Email
Jan 26, 2009
11:49 pm

... That was indeed what I saw later. I know the designer and he was having some experimental set up when I spoke to him last week.. This set up implied use in...
achtung_999 Offline Send Email Jan 27, 2009
12:17 am

I don't think it would be very hard to modify a typical Audio A/D converter design to do the job needed here. Remove the AC coupling, change the input scale to...
James Husted
ersatzplanet Offline Send Email
Jan 27, 2009
1:37 am

Exactly what I have been saying before, James. According to a bunch of engineers and DSP programmers I spoke to over the last couple of years, it is not hard...
Guy Drieghe D.
gddfp Offline Send Email
Jan 27, 2009
2:40 am

I wonder how the ASys rs290 sampler would do with this task. It has a very high sample rate. There's nothing in the description about recording CV's though. ...
Monroe Eskew
monroeeskew Online Now Send Email
Jan 27, 2009
5:06 am

Dear members, the 9U versions of the A-100 suitcase and the low cost case are now available. It depends upon the pre-orders of the corresponding Doepfer ...
yahoo@...
ddoepfer Offline Send Email
Jan 27, 2009
10:11 am

all this talk of midi conversion and computers is all very well ;) but the beauty of a module that records cv is that it's a MODULE that records cv. and when i...
Stu Grimshaw
grimshaw_stuart Offline Send Email
Jan 27, 2009
11:55 am

... In this case the A-112 output has a positive voltage offset (~ +2.5V), i.e. if the A-112 is used for audio the voltage does no longer swing around 0V (GND)...
yahoo@...
ddoepfer Offline Send Email
Jan 27, 2009
2:32 pm

On 27 Jan 2009, at 01:17, achtung_999 wrote: //skipperdy skip// ... In some way you are right, yes. There are certain CV's which don't yield the same result...
Guy Drieghe D.
gddfp Offline Send Email
Jan 27, 2009
2:26 am

... No.. me neither but then again I was talking purely hypothetical. ;-) This is indeed a fascinating subject. And I am very glad that a lot of people are...
achtung_999 Offline Send Email Jan 27, 2009
12:45 pm

Looking to have some diy modules with a doepfer system and was wondering if anyone has any p/n for suitable pin headers and ribbon cable for the doepfer disto...
brian
koura5578 Offline Send Email
Feb 9, 2009
9:38 pm

I've used these parts from Futurlec to make cables. On the other end I think you just want shrouded male IDC headers. 4 GRCABLE16 Grey Ribbon...
chuck j
hamzzzald Offline Send Email
Feb 10, 2009
5:25 pm

Thank you Dieter! Taking out the square waves from the lfos is also a great idea, so I will probably do that as well....
Henrik Medquist
longforparade Offline Send Email
Jan 28, 2009
8:12 am
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