Subject: Re: Any good uses for old microwave over parts?
Organization: Gyro Gearloose Productions
X-Newsreader: Gyro's Spewer 0/32.572
Date: Wed, 20 Nov 2002 13:35:44 GMT
NNTP-Posting-Date: Wed, 20 Nov 2002 08:35:44 EST
On 6 Nov 2002 15:22:31 -0800, email@example.com (Darrell Harmon)
>The only safe thing I know about is to chisel the
>secondary off the transformer and put a few turns of heavy wire
>through for a low voltage supply (spot welding maybe).
The primary winding is optimized for max load (meaning low
turns-per-volt, hence, inductance). It's idle current would be
quite high, for uses involving intermittent or variable loads.
But, a die grinder can take care of that welded bead in a few
minutes, or, if you are VERY skilled with a cutting torch (I can
blow a broken off galvanized/black pipe nipple out of the cast iron
body of a steam press, without touching the female threads in the
boss of the press, and so can any experienced gas welder/brazer),
you can get rid of the bead even quicker.
Once the bead is removed, you can slide the core laminations apart,
unwind the secondary, and add a few turns to the primary. Then,
wind whatever secondary voltage you want. You should get about 100
amps at 15 volts ... enough to make a slick battery charger/booster.
Just get some old, cheap surplus SCRs or germanium power transistors
and wire them as diodes.
Oh, yeah ... a couple of them in series will give you 30 OCV, enough
for a dandy and simple arcwelder...
"The first step in intelligent tinkering is to
save all the parts." - Aldo Leopold