Hi John , there's a small printed circuit board say 4" x 6" attached to a larger black potted block with some large terminal connections. At the top of this there are two components. One is a small copper wound coil the other is a square block with some small control wires. Then there's also an scr bridge rectifier (ive identified this by looking online). Sorry to be so vague, it's difficult to explain without sending photos
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