SynthModules

If you would like a premade PCB to make up some circuits like this,
you can use the DB-320 from Scott Juskiw.  It is a TL074
constructucted into 4 separate inverting op amps.  The resistors from
amp + to ground are included to provide the best offset as Dave
suggested.  You would have to add one resistor each for the inverting
summing amps to provide the offset from the power supply.  Tehy coudl
easily be tacked on the bottom of the PCB since VCC is available for
the chip power supply. near the pin (-) required to attach the offset
bias.  Two of the amps could be constructed like this and the other
two as simple unity gain inverting amps to invert the signal back to
normal. You end up with two complete circuits on one PCB.

This might be a bunch easier that using perfboard.
Larry H

http://www.tellun.com/motm/diy/db320/DB-320.html


--- "Scott E." <yahudinyhwh@sbcglobal.net> wrote:

> Thanks, Dave.
> 
> Scott
> ===============================
> djbrow54 wrote:
> 
> > I scanned, and uploaded a schematic to the photos section in
> > the DJB PSIM-1 folder. - Dave
> > 



	
		
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