In the thread discussing the IRF-510 withstanding HI-SWR the subject of temperature monitoring was mentioned.? So as not to hi-jack the thread, let us continue....

Monitoring the IRF-510 sounds like? a great idea.? One comment was made about the lack of I/O pins.? All we need to do is to use the Dallas/Maxim DS18B20.? It is referred to as a 1-wire device.? Signal, power, ground and a single pull up resistor are all that's required.? What is even nicer, there is an Arduino lib for it already (plug and play!)? Take a look here for some details:?

By adding a simple compare statement, you can create an alarm to shut down/lockout transmission until it cooled down.

Paul, AA9GG