I got irf3205 transistors

chipper · 27th March 2010, 07:08 PM

Okay second time I'm attempting to repair a Rockford fosgate punch 225.2 amp that I have. The first time I put in newer fets they failed immediatly! Now I've got IRF3205s for the power supply. I don't got accurate testing instruments thought but i got a 10 amp 12v power supply so I think I'm going to take it to school (I have an electronics class) so Im going to use there testing equipments. What could cause them to fail???? Outputs or drive transistors? I also need a small smd resistor not sure of the value? I've been told it is 47 ohms for the gates on the ps fets. Those are out of tolerence and one is missing.

Perry Babin · 27th March 2010, 07:35 PM

Gate resistors that are out of tolerance (or missing) could easily cause the FETs to fail. Before you apply power, connect only the remote and ground wires and measure the DC voltage on the gate pads for the power supply FETs. They should all read approximately the same (~5-6v DC).

27th March 2010, 07:08 PM	#1
chipper diyAudio Member Join Date: Oct 2008	I got irf3205 transistors Okay second time I'm attempting to repair a Rockford fosgate punch 225.2 amp that I have. The first time I put in newer fets they failed immediatly! Now I've got IRF3205s for the power supply. I don't got accurate testing instruments thought but i got a 10 amp 12v power supply so I think I'm going to take it to school (I have an electronics class) so Im going to use there testing equipments. What could cause them to fail???? Outputs or drive transistors? I also need a small smd resistor not sure of the value? I've been told it is 47 ohms for the gates on the ps fets. Those are out of tolerence and one is missing. __________________ Feel the PUNCH

27th March 2010, 07:35 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Gate resistors that are out of tolerance (or missing) could easily cause the FETs to fail. Before you apply power, connect only the remote and ground wires and measure the DC voltage on the gate pads for the power supply FETs. They should all read approximately the same (~5-6v DC). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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