[AMRadio] PW Supply


Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Sat Dec 2 21:23:33 EST 2006


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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