Light Up a Candy Dish

You can use my Light Up Halloween B circuit board to light up a candy dish or anything you desire. This one is for Halloween with a skeleton wreath and a pumpkin bucket for the dish. In this circuit I am using what I call an interrupter. It has both... Read more »

Mario Coin Block Lamp

A few days ago, a friend told me that he saw a similar project on, and asked me to build one. Unfortunately, like my green lantern ring, I forgot to take a picture of the one I made for him so I built a simpler but less good-looking one... Read more »

Hear with Ultrasound Using a TL494 as a Flanagan Neurophone

Patrick Flanagan invented the “Neurophone” over 40 years ago. His original patent (US3393279) was basically a radio transmitter that could be picked up by the human nervous system. It modulated a one-watt 40kHz transmitter with the audio signal, and used very near-field antennas to couple it to the body. It... Read more »