[sdiy] Substitute for IMF-3958 ARP 4015 S/H SubModule

[Csaba Zvekan]

HI,

OK . I have decided on Yves Ussons S/H  module. I quickly breadboarded  
the thing and it seems to when.

1. The Noise Generator Source is directly feed from the NOISE Output.
2. The Circuit gets a nice Square wave. That ARP pulse stuff just  
won't work. I have no Idea why they changed the clock from Square to   
_|_ this ??

Anyhow if I'd  remove R321 and C86 from the Noise Source / S/H Input  
it will probably work. But then what effect would the 100K S/H Input  
Slider have ? HMM...

Also if I forget  about R391,R392,C119,R390 and just jumper the whole  
thing straight from the INT Clock Output then it would work too.

What is the deal with that "ELECTRONIC SWITCH" I never understood what  
it 's supposed to do. With the A, B, C Outputs? Can somebody explain  
that part of my synth?

Or is there an easy way to modify the new S/H circuitry ?


Csaba