Photo: Sensor With Control Relay

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, laborator

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

There are many applications where you need quick availability of a relay for connection to a particular piece of apparatus. We found in developing our kits that we always needed to have a relay mounted on a PCB within arms reach.

Low cost 12 channel Infrared Remote Control with relay board

The most popular use for this kit is to make you own night-light. It can also be used to switch just about any appliance on or off in light or darkness. Light sensitivity is adjustable over quite a range. The relay can handle up to 10 Amps at 110VAC. Oper

You can program this stand alone controller via PC Serial Port. Simply connect a serial cable from your computer to the connector on relay board.

4 Channel RF Remote Control Relay Board with Auto Roll

Timer circuits are handy for many experimenters projects, not to mention the photo lab. This kit has three separate circuits that can be used individually or together. Each circuit has a separate 5 Amp relay. Circuits operate on 9 Volt DC.

You can program this stand alone controller via PC Serial Port. Simply connect a serial cable from your computer to the connector on relay board.

4 Channel RF Remote Control Relay Board with Auto Roll

This mini-VOX - voice operated relay - is based on a circuit published in Silicon Chip, 9/1994, p31.

4 Channel RF Remote Control Relay Board with Auto Roll

This is a RC car project is the transmitter and receiver modules for a Remote Control car, with speed control and continuous steering.

Power on/off almost anything with this infrared controlled electronic switch. Some spell it Infared!

Adjust the sensitivity of this circuit to control a Relay that can turn on whatever is connected to the contacts of the relay. Very practical circuit for a variety of projects. Turn on a light when your dog barks, or set of a siren when an intruder makes

A sensitive photo Darlington transistor is used with a CMOS nand gate. The circuit detects light and triggers a siren. You could add your own triac or relay and switch practically anything. The kit uses the MEL12 Darlington super alpha phototransistor, ty

This super sensor detector sounds an alarm if someone approaches the unit. Adds safety to your home or office. Learn the basics of motion detector technology. Uses pyroelectric infrared sensor.

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

The primary function of this Relay Board is to turn devices on or off. It's simple!

This kit uses an infrared beam to monitor door & passage-ways or any other area.

This stereo pre-amplifier will allow you to get extra control over your audio.