How to create time coil and electromagnet for HDR

For the time coils use a phone wire and two banana plugs.

For the HDR electromagnet use a seven inch soft iron core, around it are 12 rows of 21 gauge copper magnet wire - about 200 feet of wire. Seal it with permaseal tape, you can use black electrical tape too, but permaseal is better.

Attach to the ends of the HDR electromagnet two banana plugs. This allows you to connect the electromagnet to the HDR box.