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What: Is A Latching Relay

Photo: Dual Hi/Lo Switched Relay Board Dual Hi/Lo Switched Relay Board
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.
Photo: Parallel Port Relay Switch Board Parallel Port Relay Switch Board
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
Photo: Parallel Port Relay Board Parallel Port Relay Board
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
Photo: Serial Port Relay Board  (Serial Port I/O Module) Serial Port Relay Board (Serial Port I/O Module)
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.
Photo: Serial Port Relay Board Upgrade Kit Serial Port Relay Board Upgrade Kit
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.
Photo: Infrared Remote Relay board and Remote 12 Channel Infrared Remote Relay board and Remote 12 Channel
Low cost 12 channel Infrared Remote Control with relay board
Photo: Timer Circuits Relay Switches Timer Circuits Relay Switches
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.
Photo: Sound Voice Activated Relay Switch Sound Voice Activated Relay Switch
This mini-VOX - voice operated relay - is based on a circuit published in Silicon Chip, 9/1994, p31.
Photo: Auto Roll 4 Channel RF Remote Control Auto Roll 4 Channel RF Remote Control
4 Channel RF Remote Control Relay Board with Auto Roll
Photo: Simple PCB Relay (Printed Circuit Board) Simple PCB Relay (Printed Circuit Board)
The primary function of this Relay Board is to turn devices on or off. It's simple!
Photo: Auto Roll 2 Channel RF Remote Control Auto Roll 2 Channel RF Remote Control
4 Channel RF Remote Control Relay Board with Auto Roll
Photo: Photo Sensor with Control Relay Photo Sensor with Control Relay
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
Photo: Touch Switch Relay Board Touch Switch Relay Board
Both a touch and a contact switch are built on one PC board so that the builder can see how each works. A battery can power the contact switch but you'll need an AC power supply for the touch switch to work well. The circuit switches a relay with a 3 Amp
Photo: Sound Activated Electronic Switch Sound Activated Electronic Switch
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
Photo: Auto Roll 10 Channel UHF Remote Control Auto Roll 10 Channel UHF Remote Control
4 Channel RF Remote Control Relay Board with Auto Roll
Photo: Universal Relay Timer-Switch Electronic Kit Universal Relay Timer-Switch Electronic Kit
Set this relay-based timer for anywhere from a few seconds to about 15 minutes so that you can time on/off almost anything.
Photo: Light Activated Relay Switches Light Activated Relay Switches
Three relay-based electronic switching circuits that switch according to light levels.