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#### Guy Paddock

- Jan 1, 1970

- 0

electromagnetic coil. The original coil this transformer drove was rated for

4 amps and 25 volts. My digital multimeter tells me that the transformer

itself puts out around 27-28 volts, actually. Anyways, I am building the new

coil myself. I have already wound it and measured its impedance. According

to the original rating, the original electromagnetic coil should have had an

impedance of 6.25 ohms. My coil, at the moment, has an impedance of about 8

ohms. My coil will be applied differently than the original coil however; I

need mine to repell something, not just attract it, so I got a 4 amp, 50PIV

Full-Wave Bridge Rectifier at RadioShack and connected it between the

transformer and the coil. Currently, the transformer powers the coil as

required, with specific magnetic poles, and it is capable of repelling other

magnets, but it only functions for a short time (5-10 minutes). During this

time, the transformer gets very hot, and the coil gets a bit warm as well.

My question is this: shouldn't the fact that my coil has a higher impedance

mean that there should be LESS of a load on the transformer? If the first

coil had a 4 amp draw, and had an impedance of 6.25 ohms, then mine, with an

8 ohm impedance, should only have a draw of 3.125 amps (at rated voltage).

If this is so, why am I experiencing a heat issue?

TIA

--Guy