[sdiy] simple circuit to adapt pedals in a module?

[Derek Holzer]

I can't really imagine a much simpler circuit than the CGS 60.

On the "to effects" side, it just chops down the voltage of the signal 
with a passive voltage-divider by a factor of 20.

On the "to synth" side, it uses a simple, non-inverting op-amp buffer to 
boost the weak effects signal 20x.

If your effects won't go back into the synth, you can even leave the 
second part out.

But both of these things will need to be done to get the levels matched 
bi-directionally. The ratios could be changed, but the circuit would 
remain the same. Alternately, if you only want to send to the effects 
then a single pot wired as a voltage-divider would allow you to adjust 
the "to effects" level.

Why not breadboard this one?

D.

legion at helpwantedproductions.com wrote:
> I'm working on making some guitar pedals and other kit designs that run
> off a 9vt PS and take a high input into my modular synth. I've got the
> power/regulator circuit down but was wondering if there is a simple
> circuit to allow the mismatched audio signals to talk to each other
> easily. I'm familiar with the CGS 46 and CGS 60 PCBs but was hoping for
> something a bit simpler without the jacks and such since I might make some
> old 9vt pedals into a module and also mount some module PCBs to make them
> into guitar pedals. I just need a few builds of the basic part to
> experiment with before I decide what I'll officially make.
> 
> An existing PCB design would be ideal but I can jury rig or breadboard
> something too if it'll get the job done much cheaper.
> 
> Thanks for any/all info!


-- 
::: derek holzer ::: http://macumbista.net :::
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