Electronics

• Component Ratio/Product Calculator - given a component ratio or product, lists possible component values and error resulting from component quantization
• Dimmers for fun and profit
• Macintosh Plus mouse emulation circuit
• How to find the polarity of AC adapters, components, and various things.
• Random Circuits from the past
• Make an iPod charger (partly) on declining balance!
• "Door Message" version 2 -- the original is on the random circuits page, above.
• Computer interface for the Pro-Lite PL-2100E scrolling LED sign
• The 49th Parallel, the computer interface for Canada, possibly useful as a simple digital/8-bit analog data acquisition board.
• Guide to Pumpkin Drop, including electronics.
• (dead) UGCS blinkenlights