RF Amplifier Protector Circuit

This circuit protector is so simple, but it has big function in protecting your rf amplifier device. There are three kind of protect : heat sensor, DC forward - reverse and input over drive. If the input signal more than threshold limit, relay will engaged to disconnect power supply voltage.

The input part signals for protecting are :
* Termo Switch (Heat Sensor Resistance) from your active component, RF Power transistor/FET.
* Forward and Reflect (reverse) from your directional coupler after your Low Pass Filter Output.
* Over Drive from directional coupler at the input of your rf amplifier to limit power input in normal condition.
* Relay (12v DC) for disconnecting power supply of your RF amplifier if condition for protecting happened.


Attention> :

Do it manually before you install it in real condition. Don't forget to adjust 50K resistor for every input parts.