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

[Csaba Zvekan]

Is this maybe what I need ... the schematic  to the right ?

http://www.uni-bonn.de/~uzs159/

Csaba


On May 29, 2008, at 6:04 PM, Csaba Zvekan wrote:

> Thanks James,
>
> Yes sometimes I a have a hard time expressing myself properly,I'm  
> sorry for that .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?
>
> Csaba
>
> On May 29, 2008, at 5:18 PM, James Dunn wrote:
>
>> If I understand you correctly and you just want to replace the 4015  
>> S/H module with Yves Usson's circuit, I think I would try the  
>> following:
>>
>> 1) Connect wiper of S/H level pot R319 (100k lin) to R10 of Yves  
>> Usson's S/H.
>> 2) Connect R391 (47k) of S/H clock input to pin 12 of Yves Usson's  
>> S/H.
>> 3) Connect R393 (1k) of S/H output to pin 7 (U2b) of Yves Usson's S/ 
>> H OR pin 8 (U2c) if using the slew rate function.
>>
>>> 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 ??
>>
>> The transistor in the ARP S/H circuit needs to be turned on for a  
>> split second to sample the input voltage, so C119 reduces a gate  
>> signal to a trigger signal.
>>>
>>> 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...
>> As mentioned above, I would just leave them be and you can use R319  
>> as a level control for the attenuation of the input signal (ie noise)
>>>
>>> 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 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?
>> It's a bidirectional switch for audio or control voltages and  
>> switches one input to 2 alternate outputs, or two outputs to 2  
>> alternate inputs according to the S/H master clock rate.
>>
>> James
>
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**************
http://www.csabazvekan.com
music stuff
http://www.csaba.ch
electronic stuff
http://www.synthmaniac.com
synthesizer stuff (not fully set up yet)