[AMRadio] PW Supply


A.R.S. - W5AMI ars.w5ami at gmail.com
Sat Dec 2 21:34:04 EST 2006


Could be a protective short circuit resistor acting sort of as a fuse
too.  The resistor should blow if you get a direct short in the HV, if
the resistor is rated at 25 watts or so.


On 12/2/06, Brett gazdzinski <brett.gazdzinski at verizonbusiness.com> wrote:
> I usually wind thinner wire around something to give
> the correct shunt, cheaper and smaller then a big
> wire wound resistor...
>
> The power supply looks really nasty, it does not look
> like there are many good parts on it...
>
> Brett
> N2DTS
>
> > -----Original Message-----
> > From: amradio-bounces at mailman.qth.net
> > [mailto:amradio-bounces at mailman.qth.net] On Behalf Of John
> > Coleman ARS WA5BXO
> > Sent: Saturday, December 02, 2006 8:41 PM
> > To: 'Discussion of AM Radio in the Amateur Service'
> > Cc: k0jx at amsat.org
> > Subject: RE: [AMRadio] PW Supply
> >
> > 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.
> >
> > BTW I found this really neat site with some good info on
> > power supplies
> > http://www.qsl.net/i0jx/supply.html
> > Hats off to Tony, I0JX
> >
> > John, WA5BXO
> >
> > -----Original Message-----
> > From: amradio-bounces at mailman.qth.net
> > [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jack Schmidling
> > Sent: Saturday, December 02, 2006 7:12 PM
> > To: Discussion of AM Radio in the Amateur Service
> > Subject: [AMRadio] PW Supply
> >
> >
> > I am having some quality time with my new supply and have lots of
> > questions about things I do not understand.
> >
> > First one is, this is a choke input with a pair of 4mf's across the
> > output of the choke and a monster 100k bleeder.
> >
> > What bothers me is that there is a 10 ohm, many watt resistor between
> > the negative side of the caps and ground.
> >
> > What is this for?
> >
> > js
> >
> >
> > --
> > PHOTO OF THE WEEK: http://schmidling.com/pow.htm
> > Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver
> > http://schmidling.com
> >
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-- 
"There is nothing more uncommon than common sense." -- Frank Lloyd Wright



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