Laser Printer Corona Transformer

This arc is produced by a corona transformer out of a laser printer. A 555 timer running at 200 Hz feeds a 5 amp NPN transistor to drive the primary (yellow clips) from a 12v battery: approximately a 7 mm arc-our guess about 23,000 volts based on the dielectric breakdown of air at STP of 33kv/cm.

High Voltage

Plasma between two copper plates fed from second anode of a 13" color TV.

Power

You can never have too much power......

Electron Beam Deflection

As part of our investigation of electron tubes, we have a small CRT (bottom center) to experiment with. We have 5KV (right meter) for the second anode supplied from a cable tester (large black box). The two white dots on the screen are a result of driving a single deflection coil with a 555/power transistor circuit. Note the small stream of smoke in the lower right corner as we exceed the power capacity of a current limiting resistor.