Experimenting with a Luminescent "Capacitor"

How to Couple a Luminescent "Capacitor" to a Photoresistor or Photodiode

Luminescent materials are analogous to capacitors in that they can be "charged" with light. Thereafter, they slowly release light, albeit with a wavelength range that may not match that of the charging light.

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Voltage Probe with Tone and LED Outputs

Troubleshooting your circuit: How to build an inexpensive voltage probe.

Infrared Remote Control Tester

Quickly figure out if the batteries in your TV remote control need to be replaced.

Booster Light for Hard Drive Activity LED

Find out how to boost the brightness of your LED.

Experimenting with a Two-Way Optoisolator

How to Make a Two-Way Optoisolator in 60 Seconds or Less

Making Music with an Atari Punk Console

Go back in time to the fun days of punk music and the Atari console.

Laser Art

Introduce your laser pointer to your camera and create your own works of art.

Toy Organ Kit

DIY 555 Timer Circuit Music Maker

Fridge Alarm

Catch the midnight snacker in the act by building your own fridge alarm.

Vibration Sensor Kit

The vibration sensor kit uses no moving parts to detect vibration.