Rather than throw his old TV set away, Mark turned it (along with a few other parts) into a power supply for a plasma globe. Basic construction of the device is a flyback transformer with primary, feedback, and secondary coils. Acting like an inductor, the flyback is wired so that the feedback winding fires the gate of a transistor, which turns the primary winding off and induces current in the secondary winding. The secondary winding and plasma globe form an LC circuit that operates at its resonant frequency (20 to 30 kHz).
|Plasma globe power supply parts list|
|Amt||Part Description||Allied Part #|
|1||Capacitor 47000 mu 25V dc||857-0125|
|1||Push Button Switch||814-0001|
|1||Resistor 560 ohm 2W||296-0848|
|1||Resistor 27 ohm 1W||296-0828|
|1||Transistor NPN 2N3055||568-7389|
|1||Kapton Insulator for TO-3||619-1005|
|1||AWG enameled magnet wire||214-3598|
Other supplies: 0.5-mA fuse, 4-A fuse, heat sink, nylon machine screw, decorator light bulb, epoxy, brown paper bag, old TV set (for complete parts list and description, go to http://www.designnews.com/contents/pdf/FlybackPowerGadget6704.pdf.