[sdiy] On cloning, and the Oberheim VCO

[Aaron Lanterman]

On Apr 14, 2008, at 11:28 PM, John Mahoney wrote:

> At 05:07 PM 4/14/2008, Aaron Lanterman wrote:
>
>> Wow... sounds like it would be better to stay away from it. Going
>> along the pseudo-Van Halen interest theme, I think I'll steer him
>> towards the Oberheim VCF, adding voltage controlled resonance to it  
>> (I
>> know that's been done a million times, but it's still a good  
>> exercise,
>> and it's a circuit I understand much much better).
>
> Would the OB-X VCO be any easier? They are also discrete and are  
> more closely to the "Jump" synth then the SEM. (Was it an OB-X or  
> Xa?) Maybe they are so close to the SEM that they are no simpler to  
> clone.


I found the schematics to the OB-1 and OB-X here:

http://www.bluesynths.com/modules.php?name=Manuals&rop=O

I don't know about the rest of the synth circuitry, but the VCO looks  
to be very very close, if not identical, to that of the SEM (I didn't  
look at it in a whole lot of detail though.) Too close to the SEM to  
tackle at this time, at least...

- Aaron