This is my first post here, I hope I'm in the correct area.
This is my problem, I bought this circuit to receive caller ID over protocol DTMF.
I have a few 5V power supplies here, (0.45A ,1A and 4.6A), both (0.45 and 1A) works with my circuit, but the 4.6A doesn't.
Also I tried to use my USB port. It works until I connect my USB printer to the computer, then it stops working. (With "works" I mean, the circuit is able to detect the caller ID, because all of them, turn the circuit on.)
And if I use the power supply of 0.45 or 1A, and connect the ground together with the one with 4.6A or the ground with USB port when the printer is connected, it stops decoding the caller id.
With an USB power bank, the circuit works too, does anyone know what is going on with my power supply?