windozeuser
Member
I'm working on a RF amp, the power supply is working fine I replaced all the power supply mosfets and drivers, and it idles with 1.7amps of current and doesn't go into protect mode anymore.
The output mosfets were bad but not shorted, I removed them completely from the amp and it still worked fine idling with 1.7amps of current. The output drivers I replaced them all, and then turned the amp on and two small capacitors blew....
I checked the drivers nothing heated up, and I didn't mix anything up. Did the caps blow because the drivers were bad before and replaced them and they were trying to drive the output mosfets that aren't installed?
The two caps that blew are in the power supply though, and when I tested the amp when they blew, I only had two ground screws installed on the board. The board has like 20 ground screws to the chassis, and my friend said that could have blew the caps.
The one cap that blew is tied to ground right off of B+ 12 volts, the cap is rated for 25 volts how could it blow with a bad ground? Could it be from the switching powersupply?
The other cap is in the power supply too tied to ground , but I dont have that on the schematic to show you
What is this cap for?
Thanks
The output mosfets were bad but not shorted, I removed them completely from the amp and it still worked fine idling with 1.7amps of current. The output drivers I replaced them all, and then turned the amp on and two small capacitors blew....
I checked the drivers nothing heated up, and I didn't mix anything up. Did the caps blow because the drivers were bad before and replaced them and they were trying to drive the output mosfets that aren't installed?
The two caps that blew are in the power supply though, and when I tested the amp when they blew, I only had two ground screws installed on the board. The board has like 20 ground screws to the chassis, and my friend said that could have blew the caps.
The one cap that blew is tied to ground right off of B+ 12 volts, the cap is rated for 25 volts how could it blow with a bad ground? Could it be from the switching powersupply?
The other cap is in the power supply too tied to ground , but I dont have that on the schematic to show you
What is this cap for?
Thanks