On 2022-12-06 10:54, Edward Mccann wrote:
Clearly case of stimulation of overactive ham hormone resisting
disposal of anything looking potentially useful.
*** That happened to me! I was working at a railroad electronics shop.
It
was around 1985.
One day, the boss decided to clean house. Among the many goodies I
rescued
from the dumpster were
* 4 Large 48VCT power transformers
* A berry box of TO-3 PNP Darlington transistors
* A giant heat sink, drilled for TO-3 transistors
...So I built a power supply. I bolted 5 of those Darlingtons to the
monster
heatsink, put them in parallel with emitter resistors, in the negative
leg of
the output of my bridge rectifier, which was bolted to a thick aluminum
bottom
plate. This allowed me to ground the collectors of the transistors and
dispense
with insulating washers. Using the input taps of the power transformer,
I was able
to adjust it for just the right head room.
That supply did 20A with no fuss whatsoever. I think it was actually
capable
of 40A.
This year, I dug it out of the junk, powered it up - and it still
works! Not
only that, it was 12.000V.
Another use I found for this stuff - the flea market had yielded up a
mint condition
Galaxy V transceiver. But it had no power supply. I took apart one of
those big 48V
power transformers and rewound it, to make a supply for the V.
- Jerry, KF6VB
Thanks all!
Ed McCann
AG6CX
On Dec 6, 2022, at 10:47 AM, Edward Mccann <edwmcc...@gmail.com>
wrote:
Tnx Jim.
Label claims to be 12DC out, but clearly needs to be measured as
investigation proceeds!
Minimal specs, but autopsy underway.
Ed McCann
AG6CX
On Dec 6, 2022, at 10:29 AM, Jim Brown <j...@audiosystemsgroup.com>
wrote:
On 12/6/2022 10:16 AM, Edward Mccann wrote:
Slightly off topic, I will admit, but in reworking garden walkway
low-voltage (12 v DC) I made surplus a 200 VA transformer.
Is what you have a transformer (two windings on ferrous core,
providing low voltage AC) or a power supply (transformer plus
circuitry to provide DC output?
73, Jim K9YC
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