Water: Level Controller

This circuit will allow you to control the level of a liquid. It switches a relay once the desired level is met.

Schematic for an electronic audio level VU meter that uses LED's to display the volume/audio levels.

Preprinted Circuit Board with all the parts to assemble a controller that allows you to change directions, vary the speed, or single step the included stepper motor. Has LED's that flash when motor steps.

This is a very eye appealing audio accessory. Displays an approximate output level for each channel of a stereo amplifier. Connects to the speaker terminal; levels are displayed in ten steps. User may select either a moving dot bar appearance. Uses two LM

This kit allows you to control the speed of an AC motor. It can provide high torque at even low speeds.

This kit uses a Grey switch aka bit switch, to single step a unipolar stepper motor in either direction. Uses a

Use an old PC as a dedicated controller to turn on or off devices lab or radio shack. The circuit includes eight relays controlled with (included) software for either DOS or Windows 3.1. The kit is a boon to the Science Fair project, laboratory experiment