[Amps] WD7S lack of HV circuit ?

[Ulf (SM0NOR)]

Is it the "WD7S PRODUCTIONS HIGH VOLTAGE POWER SUPPLY BOARD HV-2" you are looking for?
I have the pdf. I managed to download most of the stuff by wayback-machine a few years ago.
73 - SM0NOR
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Skickat: den 31 maj 2024 15:58
Till: amps at contesting.com <amps at contesting.com>
Ämne: [Amps] WD7S lack of HV circuit ?

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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