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Old 17th July 2015, 12:33 AM   #1
Ron E is offline Ron E  United States
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Location: USA, MN
Default Mystery transformer

Saw a little transformer/inductor for ~$1. A ~2"x2" little EI core thing.
Thought it might be fun to figure out what it is and what it might be useful for.
This is what I have so far - two leads on one side, both are grey, DCR between them is about 35ohms.
4 leads on the other side, these are red1, black, red2, and green. DCR from red1-black is 3 ohms, from black to red2 is ~3.3 ohms, from red2-green is 32.5 ohms, from red1-green is 38.3 ohms from red-red is 6 ohms, black-green is 35.6. So it seems this side (secondary?) is a multitap.

I shorted the secondary (red1-green) and took a measurement (top image)
I then loaded the secondary with a 100 ohm resistor (bottom image).
With the secondary open it measures like about a 180 ohm resistor above very low frequencies

Hmmm...
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Last edited by Ron E; 17th July 2015 at 12:43 AM.
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Old 3rd August 2015, 08:46 PM   #2
Ron E is offline Ron E  United States
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So I measured the voltage on this with the gray leads hooked up to AC (121V)
R1-Blk = 26V
R1-R2 = 52V
R1-Green = 77V
Blk-R2 = 26V
Blk-Green = 51V
so it is 52VCT with an auxiliary low current winding...
It's just a bit larger than a radio shack 273-1336a transformer so perhaps it is good for 10-15VA?

I might make a dual variable power supply out of it...
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