Ulf. you connect a resistor in series with the meter not in shunt with
it. The resistor is a value which will give the correct meter deflection
for the plate current.
73, Dan, N5AR
Ulf Tjerneld wrote:
> Hi all,
>
> Thank you for all great replies to my question!
>
> I understand now it is enough with only a couple of ohms for the B- to
> chassis resistor. However, contrary to this I came across a couple of
> articles written by G3SEK in Radcom about HV PSU design (Jan-Mar
> 2009). Excellent articles that really explains a lot to me. But, in
> his example he actually uses a 100 ohm from B- to chassis. The
> resistor is also in parallel with 3 big diodes. He explains that they
> serve a a return path to ground for surge currents and that the 100
> ohm resistor is there to act as a backup for the diodes. But he does
> not mention anything about how the metering is accomplished in this
> case; with a 100 ohm you would have maybe 25-35 volts over the
> resistor, so a meter would have to be shunted. And when shunted we
> would bring down the resistance to a low value again which in its turn
> would make it unnecessary with such a high value in the first place.
> At least according to my logic!
>
> Anybody likes to comment on that?
>
> 73's
>
> Ulf SM0NOR
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