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

[Csaba Zvekan]

Unfortunately going straight to the PIN 12 didn't work either nor in  
the S/H Input. I also build the http://www.uni-bonn.de/~uzs159/  
trigger to 15V converter and tried both inputs but was  unsuccessful .  
I needs a square signal.

Csaba

On May 29, 2008, at 6:50 PM, James Dunn wrote:

>
>> So, pretty much everything works as a direct replacement PIN to PIN  
>> as you mentioned below except :
>>
>>> 2) Connect R391 (47k) of S/H clock input to pin 12 of Yves Usson's  
>>> S/H.
>>
>> this is not working since Yves S/H module I believe expects as  
>> Square Wave signal (then it works) and the ARP is generating that  
>> weird trigger signal nobody can use but ARP. I even have tried the  
>> other way around triggering my Modular DIY synth's S/H (same  
>> module) from the ARP it won't budge.Is there a little circuitry  
>> that I could put in front of Yves circuitry to accept the ARP  
>> trigger signal .Or maybe remove some parts . Because the other way  
>> around I would have to tap into R288,R386 to get the clean Square  
>> to work.
>>
>>
>>>> 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.
>>>
>>> These do a similar function to C4, D2 and R11 in Yves' circuit. I  
>>> would just use the original ARP parts and save the bother of  
>>> replacing this section.
>>
>> What if I go straight from R391(ARP) into Yves ( pin12 of U2d's Non- 
>> Inverting ) would that resolve my issue?
>
> That is what I would try. I'm by no means the most knowledgable  
> person on this list, so if someone else knows better please correct  
> me!
> Yves module does work with a square wave but this is converted to a  
> trigger by C4, D2, R11 and U2d. You could also try bypassing R391  
> and take your trigger signal from the junction of C119 and R392.
>
> James
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