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Computers: Computer Mother Board Circuit Diagram

Handy Computer Circuit Diagrams

Our members have voted the following as the most useful electronic circuit diagrams when building their own computer mother board.

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: LCD PLL Expansion Board LCD PLL Expansion Board
This LCD expansion board upgrades your exisiting BW PLL exciter / transmitter so that it has an LCD readout and easier frequency adjustment.
Photo: * USB PLL FM  Stereo Transmitter (FCC Approved) * USB PLL FM Stereo Transmitter (FCC Approved)
An excellent Stereo FM Transmitter which operates through the USB port of essentially any computer. FCC Compliant!
Photo: USB Interface Board - (Universal Serial Bus Circuit) USB Interface Board - (Universal Serial Bus Circuit)
Allows for connection to Personal Computers USB (Universal Serial Bus)
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
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The company HiTechnic has recently released a new NXT Prototyping Board
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
Shows the pins and wiring instructions for creating an RS-232 Null Modem for your PC.
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
Photo: Sequential Flasher 5 LED Sequential Flasher 5 LED
The circuit flashes five LED's in sequence repeatedly until you turn it off. Flash rate is user adjustable. The circuit uses an IC chip on Board which you will then mount on the included mother board; battery holder is included. Powered by a 3 volt supply
Photo: Broadcast Warehouse All-in-One 1 Watt FM Transmitter PCB (Fully Assembled) Broadcast Warehouse All-in-One 1 Watt FM Transmitter PCB (Fully Assembled)
This is the Brodcast Warehouse All-in-One PCB 1 Watt FM Transmitter. This item has a built in limiter / compressor & stereo encoder!
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!
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: 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: USB PIC Programmer Kit / Circuit Diagram USB PIC Programmer Kit / Circuit Diagram
USB Flash PIC programmer