I am trying to design a guitar distortion pedal circuit and I need +9 / -9 V dual supply in my application. I have two 9 V adapters:
https://www.phihong.com/assets/pdf/PSM03A-XXX.pdf
Would it be a proper way to create a virtual ground and dual supply if I connect the outputs of these two wall adapters in the following way?
What are the drawbacks? Would ripple be out of space? Or would it explode in some circumstances because I haven't seen any application as such?
Best Answer
There are two possible problems.
Figure 1. The PSU has high ripple.
simulate this circuit – Schematic created using CircuitLab
Figure 2. (a) Two 9 V SMPS supplies represented by 7809 9 V regulators. This should work. (b) Trying to generate a split rail supply using an 18 V supply and a 9 V regulator doesn't always work.
Your circuit should be OK. If ripple proves to be a problem a couple of hundred µF of capacitance across each rail should help.