Re: IRF510 amplifier failures
toggle quoted message. . .
Here is another:
In the middle of the page, is this:
"I destroyed many IRF510 FETs during testing. In fact I blew a small hole in one and another into several pieces. It was quite a shock when the first one was destroyed because it made a loud noise like a rifle being fired.
Once I got tired of replacing the FETs, I built a current sense circuit, which shuts off the bias once the amplifier draws more than about 3 amps from the PSU. I think this circuit is essential. You can build it into the Power Supply or into the Amplifier. I built it into the Amplifier because the power supply, which is also homemade, does not limit until 7 amps. With the current limit circuit the amplifier now survives transmitting into any SWR from an open circuit to a short."
There is a schematic for the current limiting circuit that is used. This might be something to incorporate into the design. It is only 7 more parts.
Marco - KG5PRT
On Thu, Jan 25, 2018 at 10:48 PM, Arv Evans <arvid.evans@...> wrote: