Step Amplifier -Diag3.pdf (672.85 kB - downloaded 68 times.) [ Specified attachment is not available ]Dear all,
I am trying to troubleshoot the circuit below.
I can detect a staircase signal from pin 6 of U350B up to pin 3 of U380A, as expected.
However, I can't detect any signal at U380A output, pin 1 or the base of the Darlington transistors ( I am using a scope for that).
What I can't understand is that the signal appears again at either transistor collectors.
why this happens?
This has happened before in similar circuits, so my understanding of this topology is nonexistent and I decided to ask for help.
Thank you in advance,
Roger
Step Amplifier -Diag3.pdf (672.85 kB - downloaded 68 times.)