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.

Frugal

My Grandparents came from very modest means. Both were frugal and careful with spending. For example, my Grandmother's kitchen knives had a nearly limitless lifespan as they could be sharpened by hand many, many times without need to buy a new one!

Gyroscope

Our first generation mechanical gyroscope.

Printer Modification

This is a control board added to a small HP printer that controls the x and y axis motors plus a solenoid that lifts and drops a pen. The control board is attached to a joy stick for etch-a-sketch like drawing on paper in the printer.

USS Freedom

Newest Navy Ship....on board just 30 days after launch!

View of the Charles

This photo recently (June 09) won an honorable mention at a juried art show.

High Voltage

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

Fall has arrived....

Tube B+ Power Supply

Assembled today from parts scavenged from an old PA system, an audio multiplex switch box, and a zip drive box; output of 325 VDC for tube projects.

Magnetic Field

If you did not believe in the effect of a magnetic field on moving electrons....The 70's have returned....a magnet from a tweeter out of Ohm-H speakers