[sdiy] 3340 VCO question - setting the lowest frequency

sleepy_dog at gmx.de sleepy_dog at gmx.de
Tue Sep 12 22:46:33 CEST 2017

> Memorymoog comes to mind...
> schematics (but actually not finding it, does anybody have it?)

not in here?


Am 12.09.2017 um 21:22 schrieb Mattias Rickardsson:
> On 10 September 2017 at 13:56, Tom Wiltshire <tom at electricdruid.net> wrote:
>> I’m reluctant to increase the cap value although in some ways that’s the obviously thing to do. Every single design I’ve ever seen for this chip uses the 1n value for the cap, and I’m not feeling confident enough to go against the opinion of every synth designer in history!
> Oh, come on, Tom - do it! :-D
>> But maybe none of those synths went this low? (It *is* sub audio, after all…)
>> Does anyone have any experience to offer?
> Not exactly experience, but the Memorymoog comes to mind... IIRC it
> has 19 VCO chips where one is used as the LFO. Looking for the full
> schematics (but actually not finding it, does anybody have it?) I
> stumbled across this instead:
> http://www.synthdiy.eu/files/Memorymoog%20Voice%20Modulation%20(from%20Tech%20Service%20Info%20p%2021).png
> Oscillator 3 can apparently be switched down to low-frequent duties
> using a larger capacitor, and the service documentation describes how.
> /mr
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