How can you have rail-rail oscillation with no outputs in the amp?
When the relays won't engage, does the amp show that it's in protect mode?
When the relays won't engage, does the amp show that it's in protect mode?
U make a good point. my scope was set to ac for some reason so it looked like rail to rail, my mistake. are the relays part of the ps or the output section. in my mind it seems to be a part of the ps.
Relays are virtually always one of the last components in the circuit before the speaker terminals, in the output of the audio circuit. See attached for a similar amp.
When the relays won't engage, does the amp show that it's in protect mode?
When the relays won't engage, does the amp show that it's in protect mode?
So, essentially no voltage on either coil terminal? Are you sure?
DCV on terminal 12 of the TL494/ka7500?
DCV on terminal 12 of the TL494/ka7500?
I don't know what I was measuring yesterday but today on one side I have the input voltage of 12vdc and on the other side of the relay I have 10.8vdc