|[AMRadio] PW Supply|
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
> 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.
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