There's another factor to be considered.
Sometime ago I was considering using a PIC as an amplifier controller, and
certainly there are certain advantages to that approach for sequencing,
step-start timers. metering etc.
However, my concern was using the device for protection - knowing my luck just
as when it was needed to do a shut down, say after a flash-over, the thing
would lock up, and you'd be waiting for the watchdog timer to reset it while
the amp is sitting there merrily arcing away!
Also remember there's a certain latency from the time the PIC detects the
shutdown signal to the time the outputs can change.
In the end I used a thyristor as the main control element - it's fast and once
it's triggered it's going to stay triggered!
Regards
David G4FTC
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