Electronics > Projects, Designs, and Technical Stuff

Auto-Standby circuit doesnt work as expected

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Michaelaudio:
So this is an Auto - stby circuit for a 2.1 Ch Amp with 3x TPA3116. I copied this circuit from a H/K Sub so it works (yea somehow) So I assembled the pcb (without the TPAs) and tested the circuit, everything fine the Mosfet is switching off after ~15 mins. But now everything is assembled it doesnt switch off anymore.. the voltage at pin6 on IC9b is 7.7V @24V input and on Pin 5 it rises. So when the voltage at p5 is >7.7 it stays for like 0.1sec over 7.7 and gets back to like 7.6 and it starts over and over and i dont know what it is, the input Voltage is stable and im running out of ideas, HELP!  (Audio signal would Come in on the 2 47k resistors, the voltage on the output at Pin 7 ic9 would stay low if signal applied)

OM222O:
maybe start by posting a schematic of the actual circuit?

Michaelaudio:
I was just adding it

tooki:
Post the whole schematic, not just part of it — at least not without identifying the inputs, outputs, etc.

(Not sure why you’d even bother posting a screenshot of a part of the schematic here, when in another thread you posted the entire schematic as a PDF!  :palm: )

tooki:
You could also just use the TPA3126, which is pin compatible but has much lower quiescent power consumption, then dispense with the whole auto-power circuit.

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