emcelhannon

high power lead needs to power or trigger an electromagnet.

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Hi,

I'm trying to wire a circuit that will use the high voltage lead from an old crt to power an electromagnet. I'm getting no reaction from my coil...lots of juice, no magnetic field.   Is it an AC thing? I thought the hp leads on crts were dc.  Just in case I took a high voltage diode from a microwave and fit it in, but it made no difference. What are my options? 

Many thanks for your replies.

Ernie

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The magnetic field from a coil is governed by the current through it. A CRT supply  certainly won't deliver much current. You would probably do better with a torch battery.

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An AC current will give an oscillating field, and the current will be smaller because of the increased impedance from the inductance.

You can increase the field by increasing the number of turns in the coil, as long as you aren't power limited.

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