[AMRadio] PW Supply


Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Sun Dec 3 18:43:13 EST 2006


Maybe its to prevent some surge when the supply
is powered on. If so, it's a dumb way to do it.

The negative is through the rack (chassis ground) I would guess.
I always run a negative directly, and don't rely on
the rack, I think it would be poor practice to rely on the mounting
of the front panel to provide a good connection.

Its also poor practice to put the current meter on another deck,
what happens when you want to use the power supply on something
else?

Brett
N2DTS
 
> 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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