[AMRadio] PW Supply


Jack Schmidling jack at schmidling.com
Sun Dec 3 00:19:04 EST 2006


John Coleman ARS WA5BXO wrote:
> It may be the only path to ground for the power supply and measuring the
> voltage across it may be the way to measure current from the power supply.
> 
> A 10 ohm resistor with 1 volt measure across it represents 100ma current.
> This is common practice for the way I measure power supply current.

But there are no other connections to it or the metering circuit.  The 
voltmeter has a 6 meg in series with the high voltage and the current 
meter is in the RF deck.

It just seems to lift the negative side of the HV off ground and it's 
not clear where the negative side of the HV supply is that goes to the 
RF deck.

I don't see what effect it would have as a short protection.


> BTW I found this really neat site with some good info on power supplies
> http://www.qsl.net/i0jx/supply.html

Thanks but it seems to only apply to full wave bridges so it does not 
help me understand much.

js

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