Re: Switching power supplies question.

On Oct 9, 11:11 pm, Grumpy The Mule <s_foo...@xxxxxxx> wrote:
Cobbling stuff together is lots of fun.  From Pressman's
book you can figure out the inductor value.  

I'm guessing a powdered iron toroid from the output of a PC
power supply would work.  Probably need quite a few turns of
moderate size ~22AWG magnet wire.  Maybe 300 turns...  ugh.
Makes my hands hurt just thinking about it.  I guess a bobbin
wound inductor would be better.  Gapped ferrite isn't bad!

Check this sitehttp://schmidt-walter.eit.h-da.de/smps_e/smps_e.html ;

I try to stay away from dumpsters but if I see anything electrical
or electronic in one it's neigh impossible.

jimmi...@xxxxxxxxx wrote innews:d1314eb0-8138-4a4c-8361-f59d15455d25@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:





Like you said I like to Frankenstien things. I have a filter from
another power supply but I am not sure how well it will work
as it was designed for about 25 amps. Basically thats a bridge I will
jump off of when I come to it. Right now I am having enough trouble
finding an old PC power supply I can get a transformer from. Its hard
to believe about a couple of months ago I tossed about a dozen of
them. Last time I listen to my wife. I do have a couple of
transformers from some old Lambda power supplies. Thes are some really
nice ones probably capable of handling a couple of  Kwatts. Im not
ready to experiment with them yet. Although this is learning by
destuction it's cautious destruction. I will probably take a trip down
to the local computer place this weekend and do a little dumpster
diving or make a run on the goodwill store and see what I can get for
$10. IF you havent figured it out by now I love building things from
others discards. When I was in high schooI  I built a killer stereo, I
thought at the time, from old stuff I found in the dump that was the
envy of most of my friends. Ive enjoyed doing it ever since.

Jimmie- Hide quoted text -

- Show quoted text -

From what I gather fro mthe website there is little danger in making L
to large within reason so I can expect my bits and pieces removed from
old power supplies to work. If they dont its probably because its too
small.


Jimmie
.

Relevant Pages

  • Re: Switching power supplies question.
    ... book you can figure out the inductor value. ... I'm guessing a powdered iron toroid from the output of a PC ... I try to stay away from dumpsters but if I see anything electrical ... finding an old PC power supply I can get a transformer from. ...
    (rec.radio.amateur.homebrew)
  • Re: What Oscillator is in This PS?
    ... beta-limited, D5 back-biased, zero volts across the inductor. ... Wenzel used an auto-connected audio transformer for L1. ... The car radio vibrator supplies were forward converters, ... Some of the car radios were quite good, and I used them as home ...
    (sci.electronics.design)
  • Re: What Oscillator is in This PS?
    ... beta-limited, D5 back-biased, zero volts across the inductor. ... Wenzel used an auto-connected audio transformer for L1. ... The car radio vibrator supplies were forward converters, ... Some of the car radios were quite good, and I used them as home ...
    (sci.electronics.design)
  • Re: What Oscillator is in This PS?
    ... beta-limited, D5 back-biased, zero volts across the inductor. ... Wenzel used an auto-connected audio transformer for L1. ... The car radio vibrator supplies were forward converters, ... Some of the car radios were quite good, and I used them as home ...
    (sci.electronics.design)
  • Re: Eliminating DC on an AC line
    ... > All I can think of is shunt the mains with a massive inductor. ... > Put it right before whatever sensitive load concerns you. ... > The series resistance of the transformer primary would have to be ... I measured the DC resistance of a 1500VA transformer ...
    (sci.electronics.basics)