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Voltage droop when using a quantizer   Message List  
Reply | Forward Message #19183 of 19855 |
Re: Voltage droop when using a quantizer


> I'd recommend to use one of the buffer modules A-185-1 or A-1185-2 if
> several VCOs are controlled by the same CV source. These modules do not load
> the source and include a buffer that is strong enough to drive several VCOs
> without voltage drop.
>
> Dieter Doepfer

this voltage drop occurs with just one vco after one of the slew limiters.

since this keeps coming up, i think a note on the slew limiter pages that
additional modules are necessary would only be fair. 90% of people who buy a
slew limiter are expecting it to be suitable for portamento.

solving the problem would be even better :)

cheers,

stu






Sun Jul 12, 2009 9:21 am

grimshaw_stuart
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Message #19183 of 19855 |
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I programmed a patch with my beautifully tuned VCOs, tonight. When I decided to use the A155 through a 156 to drive it, I noticed a significant voltage drop...
stuadh
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Jul 9, 2009
10:34 pm

... I'd recommend to use one of the buffer modules A-185-1 or A-1185-2 if several VCOs are controlled by the same CV source. These modules do not load the...
yahoo@...
ddoepfer
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Jul 10, 2009
7:34 am

Thanks, I have an MX 224 (Analogue Solutions) in the chain after the Quantizer and/or VC Slew. It is clearly happening inside the VC Slews....
stuadh
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Jul 10, 2009
1:53 pm

Have you checked how much current all your modules are consuming? Maybe it's too close to the quoted maximum for the power supply. In my experience with the...
Sean Williams
sean_process
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Jul 10, 2009
2:20 pm

Cheers, I'm using a homebrew case with a 3.4A power supply. Current load (approx) is 1.5A, so loads of space there. Yours Aye Stuadh...
stuadh
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Jul 10, 2009
6:28 pm

... this voltage drop occurs with just one vco after one of the slew limiters. since this keeps coming up, i think a note on the slew limiter pages that...
Stu Grimshaw
grimshaw_stuart
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Jul 12, 2009
9:22 am

... Stu, you are right. We should add a corresponding note to the slew limiter manuals. For the A-170 the design has been changed already and the new version...
yahoo@...
ddoepfer
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Jul 13, 2009
10:25 am

stuadh see the threads about slew limiters and changing the output resistor to keep tracking accurate over several octaves. sean ... [Non-text portions of this...
Sean Williams
sean_process
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Jul 10, 2009
8:44 am
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