Circuit Diagrams for Temperature Controllers

This temperature meter uses a Harris 7106 IC as the heart of a low cost, accurate temperature meter. LCD 3-1/2 digit readout. All of the active circuits are in this one, versatile chip. In addition to temperature functions, the board includes an area for

This LCD panel meter is a very flexible design that can be customized to your own VOLT meter or AMP meter needs. It may be customized to measure any voltage range, standard or not. Or you can customize it to measure input from a transducer; full details a

Learn how to control temperature with a Peltier Junction with PID temperature controller.

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.

Learn how to control temperature with a Peltier Junction with PID temperature controller.

PC controlled 4 channel temperature meter

PCB plans and circuit diagram (schematic) for what appears to be an extremely nice 100 watt guitar amplifier. Includes preamplifier and power amplifier circuit diagram and PCBs

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

Metal detectors a tons of fun. These metal detector electronic circuits will enable you to go hunting for all kinds of cool stuff, wherever you like!

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

Shows the pins and wiring instructions for creating an RS-232 Null Modem for your PC.

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