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Registered Member #3249
Joined: Mon Sept 27 2010, 08:42PM
Location: Minnesota, USA
Posts: 2
At a local surplus store today I found what looks to be a heavy duty magamp or pulse transformer. It weighs over a kilo, and has a strip wound, toroidal core with about a 2cm^2 cross section. windings are in two symmetrical and series connected groups. The single layer of windings closest to the core look like 18-20AWG, and the single layer of windings over the first are approximately 40 turns of 8AWG. At no point is the electrical insulation less than 2mm thick. The only markings on it are "407-295" "114-P-77" "23852". I couldn't find a reference for a #407 or a #114 company, and I am at a loss as to who the manufacturer might be.
Any ideas for identification or fun uses? I'm thinking it could easily handle 3-4 kv under oil...
Registered Member #3249
Joined: Mon Sept 27 2010, 08:42PM
Location: Minnesota, USA
Posts: 2
It does indeed, only more compact with fewer turns and no core laminations separating the winding legs...am I right in thinking these can basically be used like low freq magnetic transistors?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Firstly, my apologies for double posting. If there was an award for fumblekeyboarding, I would win.
They act as variable inductances controlled by the DC winding. To start with, see if you can dim a lightbulb with a DC voltage from something like a 6 or 12 volt battery capable of an amp or so conneced to the small wire winding. The single layer of # 8 is good for about 40 amps. Analyse the core area and winding at 60, 400, and 800 cycles to see what voltage would bring the core to about 1.5 Tesla.
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Ideas for vintage transformer
