WD7S, on one of his boards he sold, was made to shut things down in the
event of loss of B+.
If I remember correctly, it resembled a mess of series resistors, like you
would use to meter HV, (without the meter), and an extra smaller value
resistor, in series at the cold end. The V drop across the small value
resistor was like 5-7 vdc.... and was applied to the rest of the circuit.
When the B+ dropped below a given threshold, the circuit tripped, and
kicked the amp offline...like opening off the keyline etc. I think it used
a spt, or dpdy mech relay..that was always operated, with B+ turned on. I
think the coil was opened off when the circuit tripped.
I can't find the original schematic for this board anywhere.
Does anybody have any info on it ?
Jim VE7RF
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