You're right so far, Jeff.you have a voltage doubler ckt. there. Probably
2300-2400 volts no load. 6 450 volt caps in series are good for that much
with a couple hundred margin. the meter ckt. is generally one or more hi
value resistors in series with the voltmeter and a resistor to ground ,
actually b- . the values of the resistors would depend on the full scale
meter current. At , say, 2500 volts dc, the meter would probably read 3000
full scale, which would require a resistance in series with the meter of
about 3 megohms for a 1 ma. meter movement. the meter would then read about
3/4 scale. Got the idea?? If you need more info e-mail me anytime, I'll
help if I can.. 73
carl / kz5ca
----- Original Message -----
From: <K7xq@aol.com>
To: <amps@contesting.com>
Sent: Thursday, August 30, 2001 3:18 PM
Subject: [AMPS] RE: HV Power Supply Confirguartion / rectifier
>
> Thanks Carl and others,
> In studying my ARRL Handbook at basic rectifier circuits and the way it
looks like it may have been connected. It strongly looks like a voltage
doubler circuit. There are two rectifier diodes uses. Two of them tied
together at one end that also go to one end of the transformer.The other end
of one rectifier goes to the (+) side of the filter, the other end of the
other rectifier diode goes to the (-) side of the filter bank. It looks like
the other end of the TRANSFORMER goes to the "CENTER" of the filter bank
three capacitors on each side of where this point looks like it might have
been connected ) rather than the end of the filter bank. The filter bank
consists of (6) series 450 VDC 480 uF Capacitors with each capacitor shunted
with a large 25 K resistor.
>
> The only other questions is where the voltage meter connects. It looks
like it was connected at the next to the last capacitor (+ side ) before the
last ( last capacitor being the clostest to ground ). Does this sound like
the right location ??
>
> (+) -||--||--||--||--||--||-- (-)
> ^
> Voltage meter tap ???
>
> Jeff K7XQ
>
>
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