Changed the resistor. Now the value is 1k..ampere drops to 7amps, still to much. 640n heats up, and no clean signal on this fets. Just read your message. Will change the resistor back.
Remove the 640s and install a 0.01uf cap from gate to source. Post the waveform across that cap.
Why did you change to 10v/div?
It's not bad. The load is significantly more than the FETs.
Do you still have the 10 ohm resistor across the speaker terminals?
If so, did the current draw only start after the relay closed?
It's not bad. The load is significantly more than the FETs.
Do you still have the 10 ohm resistor across the speaker terminals?
If so, did the current draw only start after the relay closed?
No, not yet. I have to check, if I have a working one. Maybe I can take another one for testing.
No. Don't install them. I thought you stated that they were in the circuit, earlier.
The reason that it's drawing current with the 640 is because the FET is conducting and driving DC to the load.
If all of the drive signals look the same with the loading cap, I think I'd try installing both 640s and 9640s.
The reason that it's drawing current with the 640 is because the FET is conducting and driving DC to the load.
If all of the drive signals look the same with the loading cap, I think I'd try installing both 640s and 9640s.
Hello Perry, the next amp is the same design. But this one has no oscillation. Should I make a new thread?