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echo: electronics
to: WAYNE CHIRNSIDE
from: Roy J. Tellason
date: 2003-07-26 04:06:28
subject: power supply

WAYNE CHIRNSIDE wrote in a message to ROY J. TELLASON:

-=> ROY J. TELLASON wrote to WAYNE CHIRNSIDE <=-

 WC> Darned little just what I recall from my ARRL Handbook.
 WC> They are designed for resonance at line frequency in such a way
 WC> that they are much more tightly voltage regulated
 WC> over rated load and input voltage swings.
 WC> Regards to altering them for different voltages I
 WC> believe you are out of luck as that is precsely what they
 WC> are designed to prevent.

 RJT> That's about what I figured,  but I haven't yet traced out the wiring
 RJT> in that thing,  it may be that there are taps I can use.  Or if it's a
 RJT> 4-diode bridge rectifier I can maybe go to a 2-diode setup if there's a
 RJT> center-tap,  which would give me 12 volts out instead of 24.

 WC> Those would be the only likely workable solutions I would think 
 WC> stood a chance of working.

Yeah.  If not,  I'll just use it at 24V,  though I don't have any immediate
need for it.  I do have a number of 24v relays and such,  maybe some other
bits here and there.  I can see where it'd be handy if I had to run some
long wires around a house,  once we get one.  Lots less voltage drop and
since power loss is I-squared-R twice the voltage means half the current
for a given power which means one-quarter of the power lost.  And operating
at lower currents means I can run smaller wires.

I think thermostats run on 24 volt circuits,  can't remember much else offhand.

 WC> BTW, up and running Win 98 again!
 WC> Turned out to be a lousy drive ribbon cable!!!

Yeah,  I saw that in TECH.

 WC> Good thing I did not throw out tha 6.4 Gig Quantum drive when I 
 WC> thought it was toast :-)

Anyway!

 RJT> I can think of a few things I can use 24v for,  but they don't amount
 RJT> to much and sure as heck don't need 10 amps!

I'll probably think of more as time goes on...

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