I was looking for a problem with the drive but it's difficult to do with nothing more than a 45Hz (low-frequency) signal. I didn't see a problem with the waveforms you posted.
Could the amp possibly have been going into low-voltage protection as it tried to power up with the two FETs in the circuit?
One of the output inductors looks like it got hot. Could it be defective?
Could the amp possibly have been going into low-voltage protection as it tried to power up with the two FETs in the circuit?
One of the output inductors looks like it got hot. Could it be defective?
Now that you mention, I see something wrong with an inductor, I will remove it and check that they are not shorted.
I have measured the coils and they are in good condition, they mark approximately 35uH and I placed 4 fets, 2 on each side and now it does not make noise, but it turns off and on it does not stay, that only does it with the coils on
Do they get hot when tightly clamped to the heatsink?
Are you sure that the amp isn't going into low-voltage protection from the 12v supply dropping when the outputs switch on?
Are you sure that the amp isn't going into low-voltage protection from the 12v supply dropping when the outputs switch on?
the PS remains at 12.75v, I am doing all the tests with a 55w series bulb, in total current there is 2.3 amps and the bulb stays on and does not turn off
I just found another 1d transistor (q263) with a hole, I already replaced it, but it's still the same
If the bulb is in series, the voltage at the amp's terminals is dropping.
Confirm that the voltage across the two 3120s is still about 20v.
The failure of that transistor could have prevented the regulator from regulating the voltage to the 3120 and could have damaged it.
Confirm that the voltage across the two 3120s is still about 20v.
The failure of that transistor could have prevented the regulator from regulating the voltage to the 3120 and could have damaged it.
If you see only a square wave of low frequency, in my opinion and not knowing this amplifier behavior particularly, looks that the amplifier isn't oscillating at the switching frequency, thus the filter's coil at 45Hz are only shortcircuits. Their Xl is too small.
the frequency of 45hz is a signal that I put from the rca, at one point I share a photo of the frequency that is given with fets inside the board, when removing the serial bulb that I have for protection, it immediately damages the d260 q263 and the d253 I can't figure out what damages them
Assuming that the 3120 and the capacitor are OK, it's likely one of the components in that group of parts. Generally, you have to replace all at one time to make sure that you don't have one marginal part that causes the failure of other parts.
sorry I couldn't show you the wave that it generates with the fets mounted on the board, again the components mentioned in the previous answer were damaged, also 1 3120 I will have to wait for more Hcpl3120 and mmsz5250 to arrive greetings
I'd suggest installing the 3120s in sockets. It gives more options when troubleshooting as well as making them easier to replace.
The bulb in series is the best. Continue using it.
But it sounds strange for me that there isn't any high frrquency square wave in the MOSFET's gate. There must be a 50KHz or more signal.
But it sounds strange for me that there isn't any high frrquency square wave in the MOSFET's gate. There must be a 50KHz or more signal.