R
Rich Grise
- Jan 1, 1970
- 0
I've been poking around with a salvated microwave oven transformer (MOT),
and doing little diddly simple experiments:
http://www.abiengr.com/~sysop/images/MOT-test.jpg
And the 0.1 ohm resistor in series with the primary seems to be dropping
about .145 volts, +/- .4; that's an amp and a half! At 115 volts, that's
<brain refuses to do arithmetic> over 150 watts!
But nothing got even warm. It was humming merrily at 60 Hz, but it never
even got above room temperature. So, where are these 150 watts going?
Then, finally, after all of these years of dabbling in things electronical,
it hit me - that amp and a half is going through _an inductor_!!! With a
DC resistance of 1.0 ohms +/- 0.1 ohm. That's one and a half watts of
real power.
DUH!!!!!
Next, I'm gonna see what happens when I take the magnetic shunts out;
http://www.abiengr.com/~sysop/images/MOT-primary2.jpg
has anyone ever done this, and is it a good idea?
[the penny is only for scale, but I did have this wild-ass idea that the
induced eddy currents would make magnetic effects that would be physically
observable, but no such luck. )-; ]
And at only 1.4 amps, is it worth the bother to wind more primary
turns?
And are there other newsgroups that might want to participate in a MOT
saga? ;-)
Thanks,
Rich
and doing little diddly simple experiments:
http://www.abiengr.com/~sysop/images/MOT-test.jpg
And the 0.1 ohm resistor in series with the primary seems to be dropping
about .145 volts, +/- .4; that's an amp and a half! At 115 volts, that's
<brain refuses to do arithmetic> over 150 watts!
But nothing got even warm. It was humming merrily at 60 Hz, but it never
even got above room temperature. So, where are these 150 watts going?
Then, finally, after all of these years of dabbling in things electronical,
it hit me - that amp and a half is going through _an inductor_!!! With a
DC resistance of 1.0 ohms +/- 0.1 ohm. That's one and a half watts of
real power.
DUH!!!!!
Next, I'm gonna see what happens when I take the magnetic shunts out;
http://www.abiengr.com/~sysop/images/MOT-primary2.jpg
has anyone ever done this, and is it a good idea?
[the penny is only for scale, but I did have this wild-ass idea that the
induced eddy currents would make magnetic effects that would be physically
observable, but no such luck. )-; ]
And at only 1.4 amps, is it worth the bother to wind more primary
turns?
And are there other newsgroups that might want to participate in a MOT
saga? ;-)
Thanks,
Rich