I'm building a modular system composed of basically whatever circuits I like, and feel would go well the other modules (ie guitar effects, mixers, circuit bent stuff, oscillators, filters). Everything, except some circuit bent keyboards is powered by a 9v battery current.y, but I am realizing that this method wastes space and is impractical.
I'd like to use a 9v ac converter that plugs into the wall as power source that I could just daisy chain to all of the various modules. however, I think this might risk some sort of AC carry over between the circuits.
I've read some articles online, and it seems that it could work if I used a decoupling cap, like .1uf, going from + to ground at the power input of the circuit to block AC. Am I understanding this correctly, and would this be a feasible approach?
You should be fine using a single 9V DC source, but yes, you should include .1 uF and 10 uF decoupling caps on each circuit. For the non-9V circuits, you should use an appropriate voltage regulator.