[sdiy] Paia string synth BBD chorus problems

[Tom Wiltshire]

There are loads of Chorus/Flanger circuits that you could use as a  
source for BBD clock ideas. Some use specific BBD clock chips (MN  
series mainly) and some use other simple VCO designs. The LFOs are  
mostly dual op-amp triangle/square wave integrator-based designs.

If you don't find anything much, ask me off list and I'll send you  
the collection of Chorus and Flanger schematics that I've culled from  
the web.

T.

On 24 Sep 2008, at 22:39, Karl Ekdahl wrote:

> Hi list, well subject says it all; i've got a Paia Strings'n'things  
> with a dead chorus, the BBDs seem fine but all but one of 566'es  
> are dead. So i was thinking that there has to be a way easier and  
> cheaper way of making the clock work without buying new 566'es. If  
> i understand this circuit correctly, i need a BBD clock that's  
> fluctuating using a second clock (LFO) to get a chorus/flanger type  
> sound - and there are two of these in the synth. Any hints on how i  
> should do this? I did a small test using Rene's circuit at http:// 
> www.uni-bonn.de/~uzs159/bbd-clock.gif but i had no real luck (or  
> patience)...
>
> Karl
>
>
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