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Re: cgs75 hot voltage outputs

2011-09-23 by sasami@hotkey.net.au

A 20 turn trimmer will not increase your range of adjustment.
Most modulars would be unphased by seeing 15 volts at an input. Remember
that this voltage is current limited by both input and output resistors. For
example, the Serge is stated as being able to handle 25V at its inputs
without issue. It won't worry any of my designs either.
I would avoid plugging a hot voltage into an Analog Solutions module though!
I don't know the cause of this. It may in fact be operating correctly for
what you are doing to it. At the moment I am not in a position to test this
out myself.
Ken

>OK here is some more info.
>
>Most people seem to have difficulty with the transistor pin-outs not
matching the circuit. I don't think this is the problem here. The module
functions perfectly (except for hot output), and the transistors were
supplied in an Elby kit. I have emailed Laurie to see if the transistors he
supplied are correct (can't seem to find a datasheet for them).
>
>Also the calibration trimmer does offset the hot output voltage, but no
where near enough. I was wondering if a 20 turn trimmer here would allow me
to drop the voltage of the output right down whilst still maintaining the
correct triangular waveshape?
>
>Like I said it only outputs high voltages when its being triggered.
>
>It's completely useful as it is, I just have to attenuate the output. Not
comfortable send 15v signals around the modular. Or do I not need to worry
about this at all? I know it distorts my VCAs pretty quick.
>
>Any help much appreciated!
> - Kevin
>
>--- In cgs_synth@yahoogroups.com, "scozbort" <kevin.babbage@...> wrote:
>>
>> Hi!
>>
>> Can't believe I only just found this place...
>>
>> I'm having an issue with my VCS build and hoping someone has come across
it before.
>>
>> When I use the trigger in and slow fall times the module outputs very hot
voltages - I think it would go to 15v if I let it.
>>
>> But in cycle mode it outputs normal voltages.
>>
>> I suspect a wiring fault but I can't see any mistakes, unless of course I
have misunderstood how to wire it up - which is likely!
>>
>> Hoping its an easy fix and thanks in advance
>> - Kevin
>>
>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

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