3 circuits on one PCB

A

ac30irons

Active member
Hey all, so I am a thinking of cobbling together a single pcb with 3 different circuits on that will be switchable.

Now my issue is the 9v power. If all three run through the same 9v power rail they will all pick up each others filtering etc. How do I best go about separating the 3 circuits on the board so they have there own power but are hooked up to the 9v pads ?
 
I think you could use independent filtering just fine.
As long as none of them are positive ground, you should be good.

It's no different than Daisy chasing pedal power...
Assuming you're making PCBs, I would isolate the grounds of each circuit and converge them in a star ground at DC input.
If you need a positive ground, you'll need to use an isolated DC converter.
Also, in your circuit switching, try to work out a way to ground the inputs of any circuit not in use.
 
Take a look at the Parenthesis Fuzz as an example. One cap is filtering the power for all three circuits.
 
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