On Oct 10, 9:34*am, wrote:
On Oct 9, 11:11*pm, Grumpy The Mule 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.

wrote :

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 -

The computer aided design was a big help. I figured 16mH. I think I
have something about that size. I have a 20mH choke at one amp that
may work.
What you think Grumpy.

Jimmie- Hide quoted text -

- Show quoted text -

This is just way to cool. I took a 500watt Lambmda 15 volt switcher I
had used to power a solidstate amp and wound another secondary on the
transformer. I lost count of the numer of turns, maybe 100, but
after filtering and rectifying im getting about 450 volts and it has
been running since about 9:30 AM 3hrs putting out 150mA.

These transformers look a little wierd They seem to be two sepated
coils fastened together on a frame. It looks like you could take the
secondary coil off and replace it if you wanted to.
Grumpy , are you familar with this.

Jimmie