[Amps] WD7S lack of HV circuit ?

[Bill Weinel]

All of this information is still available online from the Internet 
Archive Wayback machine.

73 Bill W4WHW

On 6/2/24 04:51, Ulf (SM0NOR) wrote:
> 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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> Från: Amps<amps-bounces at contesting.com>  för jim.thomjim.thom at telus.net  <jim.thom at telus.net>
> 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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