[Amps] Fault protection

[Colin Lamb]

The glitch resistor makes perfect sense.  However, it seems like there could be a problem with putting a fuse in the high voltage section - without more.  

Assume you are operating normally and for some reason the high voltage fuse blows, that removes plate voltage - but does nothing with the driver.  So, the operator may  continue to operate - or even talks louder.

So, it seems that there needs to be an additional circuit to prevent operating the final amplifier without plate voltage.  There could be sensors incorporated to compare drive with rf output (similar to the linearity detector).

Using a relay actuated after the fuse, for the high voltage would allow breaking the transmit/receive relay in addition to shutting down the high voltage supply.

Colin  K7FM