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

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

That's great news! You could easily buck regulate the +15
down for a filament supply as well.

I've seen transformers with seperate primary and secondary
windings. If a company is building s standard product line
with various outputs they'll sometimes do that. Although it
usually increases the leakage inductance so that's the down
side. Sometimes the output inductor and transformer can be
combined.

I hope this goes though. I keep getting error 441 so I sent
you an email regarding your last post.



wrote in
:

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

Lots of great comments and ideas in this thread; thanks. Terry

On Oct 11, 1:39*pm, Grumpy The Mule wrote:
That's great news! *You could easily buck regulate the +15
down for a filament supply as well.

I've seen transformers with seperate primary and secondary
windings. *If a company is building s standard product line
with various outputs they'll sometimes do that. *Although it
usually increases the leakage inductance so that's the down
side. *Sometimes the output inductor and transformer can be
combined.

I hope this goes though. *I keep getting error 441 so I sent
you an email regarding your last post.

wrote :



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- Hide quoted text -

- Show quoted text -

Well, The transformer winding doesn separate the way I thoufgt they
did. there is a pretty good sized gap betwen them,1/8" and it seems
one is a choke. I was confused because I have a couple of old scrap
power supplies that are made as previously described. They appeared to
be the same so I made a very incorrect assumption.

Jimmie

On Oct 10, 1:11*am, Grumpy The Mule wrote:
I try to stay away from dumpsters but if I see anything electrical
or electronic in one it's neigh impossible. (Nay impossible?????)

..
Hi Grumpy: Nags me too!!!!!! (OK spot the pun?)

But got to go; to unload my pickup of a free load of firewood got
yesterday (couldn't say no to a second free batch in a week)!

Gee there were two old SPS supplies lying there too; probably all
soaking wet! I didn't even look at the old 14 inch TV lying there as
well in the junk pile.

Wet... well, I wouldn't pass them up!

I've salvaged a few pieces of gear from floods.
My most cherished HP RF sweep generator came out
of the mighty Mississippi river flooding in the
early 90's. First I carefully brush off the gunk
while washing with tap water. Then I flush with
DI or distilled water dry with a fan. Finally flush
with anhydrous isopropanol and dry with gentle warming.
After that a bit of lubriplate on any switch detents
or gears as needed. I take some things out first for
special treatment, like meter movements.

The distilled water flushes off the stuff we worry
about, ionic contamination and the alcohol removes
the water. At least that's what I hope for.

I'm trying to reform and not drag so much junk home.
Sometimes I can even pass up junked hardware without
flinching. With technical books of any sort I'm not
having much success resisting though.

Mmm! Free firewood. Which reminds me, I need to fill the
wood shed yet. Oak wilt disease is killing my trees but
at least I'll be warm.



terry wrote in news:01a69e21-6f4f-472a-9865-
:

.
Hi Grumpy: Nags me too!!!!!! (OK spot the pun?)

But got to go; to unload my pickup of a free load of firewood got
yesterday (couldn't say no to a second free batch in a week)!

Gee there were two old SPS supplies lying there too; probably all
soaking wet! I didn't even look at the old 14 inch TV lying there as
well in the junk pile.

On Oct 15, 8:13*pm, Grumpy The Mule wrote:
Wet... well, I wouldn't pass them up!

I've salvaged a few pieces of gear from floods.
My most cherished HP RF sweep generator came out
of the mighty Mississippi river flooding in the
early 90's. *First I carefully brush off the gunk
while washing with tap water. *Then I flush with
DI or distilled water dry with a fan. *Finally flush
with anhydrous isopropanol and dry with gentle warming.
After that a bit of lubriplate on any switch detents
or gears as needed. *I take some things out first for
special treatment, like meter movements.

The distilled water flushes off the stuff we worry
about, ionic contamination and the alcohol removes
the water. *At least that's what I hope for.

I'm trying to reform and not drag so much junk home.
Sometimes I can even pass up junked hardware without
flinching. *With technical books of any sort I'm not
having much success resisting though.

Mmm! Free firewood. *Which reminds me, I need to fill the
wood shed yet. *Oak wilt disease is killing my trees but
at least I'll be warm.

terry wrote in news:01a69e21-6f4f-472a-9865-
:



.
Hi Grumpy: Nags me too!!!!!! (OK spot the pun?)

But got to go; to unload my pickup of a free load of firewood got
yesterday (couldn't say no to a second free batch in a week)!

Gee there were two old SPS supplies lying there too; probably all
soaking wet! I didn't even look at the old 14 inch TV lying there as
well in the junk pile.- Hide quoted text -

- Show quoted text -

About 6 years ago while hauling off some junk from my in-laws home
near Jacksonsonville Fl some stuff caught my eye at the dump. There
were 3 tektronics scopes, a singer communications monitor and an audio
test set. All worked and some of the pieces had current calibratiton
stickers. Up until then I had been grumbling alot about wasting days
of my vaction time cleaning.

Jimmie