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Old October 11th 08, 06:39 PM posted to rec.radio.amateur.homebrew
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Posts: 87
Default Switching power supplies question.

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


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Old October 14th 08, 02:12 PM posted to rec.radio.amateur.homebrew
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Posts: 45
Default Switching power supplies question.


Lots of great comments and ideas in this thread; thanks. Terry
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Old October 15th 08, 11:27 AM posted to rec.radio.amateur.homebrew
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Posts: 78
Default Switching power supplies question.

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
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