Perry,
Dont know what happen to my last Thread cant seem to find it probably overlooked it.
Anyway Ive replaced all of the ic's on the board again. Replaced all of the regulators,resistors for the regulators,all of the outputs, the mic4420's new emitter resistors.
Just finishing up on putting the last 2 ic's back in it.
Wondering is there anything else i should check before i power this up and test the output.
I dont want this thing blowing up for the 5th time
Dont know what happen to my last Thread cant seem to find it probably overlooked it.
Anyway Ive replaced all of the ic's on the board again. Replaced all of the regulators,resistors for the regulators,all of the outputs, the mic4420's new emitter resistors.
Just finishing up on putting the last 2 ic's back in it.
Wondering is there anything else i should check before i power this up and test the output.
I dont want this thing blowing up for the 5th time
Yes. It's ~±10v on this amp (don't expect ±15v). Set your scope to 2mS, 5v/div and DC coupling. touch it to the power supply pins and push on everything in the area to see if the voltage ever varies from the ±10v.
This amp doesn't have any pulldown resistors on the FETs so you should install the opto-coupler before applying power (or desolder the red/black wires on the power supply side of the board <-- this would be best way to prevent damage).
This amp doesn't have any pulldown resistors on the FETs so you should install the opto-coupler before applying power (or desolder the red/black wires on the power supply side of the board <-- this would be best way to prevent damage).
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The drive signal looks OK but the voltage isn't right. Is the scope set to 5v/div?
Is the center knob on the vertical amp control set to the full clockwise position?
If you center the trace and touch the probe to the B+ terminal of your power supply, does the trace deflect upwards ~2.5 divisions?
Is the center knob on the vertical amp control set to the full clockwise position?
If you center the trace and touch the probe to the B+ terminal of your power supply, does the trace deflect upwards ~2.5 divisions?
Ok my probe is a 10x probe If i set it to 5volts/dive 10us/div.
The first pic is touching the B+ terminal with it set to the center line
next 2 pics is what i get if i touch the gate legs of the fets
The first pic is touching the B+ terminal with it set to the center line
next 2 pics is what i get if i touch the gate legs of the fets
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