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USB selector switch – Circuit Schematic
USB selector switch
To share a regional press like the USB printer, scanner etc. two computers, it is relatively easy. Just connect the two computers on a network device and say th...
Atari joystick to PC joystick adapter – Circuit Schematic
Atari joystick to PC joystick adapter
ome games are easier to play with digital joystick instead of analogue type. Unfortunately PC has only analogue joystick connector, which makes it impossible to...
TTL signal levels using a serial port MAX232 – Circuit Schematic
TTL signal levels using a serial port MAX232
A PC’s serial port provides signal lines that you can use to expand the number of input signals. With some additional circuitry tied to these lines, you can u...
A SPECIAL INTERFACE Joystic ( 68HC11A1) – Circuit Schematic
A SPECIAL INTERFACE Joystic ( 68HC11A1)
Using the software during flight simulation models of planes: REAL-FLIGHT, we first chose a housing of any transmitter empty direct connection potentiometers in...
PC ROM emulator circuit – Circuit Schematic
PC ROM emulator circuit
This ROM emulator improves the easiness to build/use it by reducing down its function which can be used as a ROM emurator. The kind of the ROM types to be emula...
LCD to a PC Parallel Port – Circuit Schematic
LCD to a PC Parallel Port
The circuit is pretty simple. The data lines on the LCD match up well with the data lines of the parallel port, and extra parallel port I/O lines can be used to...
8 Channel software controlled for PC fan – Circuit Schematic
8 Channel software controlled for PC fan
This article is about a software controlled, parallel port-interfacing 8-channel Pulse-Width-Modulated fan controller. I'll admit that the electronic part of it...
LCD Display printer cable with HD44780 – Circuit Schematic
LCD Display printer cable with HD44780
Connecting a LCD display to your personal computer is an easy job. Displaying data from your PC to a LCD can be proven very exiting, so give it a try and build ...
LCD to LPT board – Circuit Schematic
LCD to LPT board
The "LCD2LPT with Lirc" circuit is the compilation of two circuits found on the net on a single board. The first is LCD to LPT interface and the second an IR re...
LCD to LPT board – Circuit Schematic
LCD to LPT board
The "LCD2LPT with Lirc" circuit is the compilation of two circuits found on the net on a single board. The first is LCD to LPT interface and the second an IR re...
Computer Serial Port interface – Circuit Schematic
Computer Serial Port interface
Here is an inexpensive way to get slow-moving analog data directly into a spreadsheet on your computer! A simple circuit connects to a serial port and a short Q...
LCD Module Control with PC – Circuit Schematic
LCD Module Control with PC
This simple circuit controls a popular 2-line x 16-character LCD by a PC via printer port. It doesn't use the Bi-directional feature found on newer printer port...
PC Based GPS – Circuit Schematic
PC Based GPS
The advent of new high-speed technologies and the growing computer capacity provided realistic opportunity for new cost effective technologies and realization o...
Simple Parallel (Printer) Port Interface – Circuit Schematic
Simple Parallel (Printer) Port Interface
This is the basic interface I used as part of my Computerized Room project. This is the parallel interface only. The 8 bit input card can be found, along with t...
Adaptor for the Dreamcast serial port – Circuit Schematic
Adaptor for the Dreamcast serial port
This page describes how to build an adaptor for the Dreamcast serial port that will allow you to connect it to any computer using a standard 9-pin DSUB connecto...
Pic-plot2: a GPIB to USB converter – Circuit Schematic
Pic-plot2: a GPIB to USB converter
This adaptor will capture plots or prints of your GPIB instrument to your PC through the USB port. It fills the need of anybody who has a test instrument with t...
Null Printer Adapter – Circuit Schematic
Null Printer Adapter
This circuit is a simple adapter for PC parallel port to think that there is a printer connected to computer. This adapter is useful for testing printing speed ...
VGA to RGB converter – Circuit Schematic
VGA to RGB converter
First circuit is for connecting VGA card to video projector or a monitor which accept VGA card frequencies and has RGB + Composite sync input. This circuit has ...
PC RS485 Interface – Circuit Schematic
PC RS485 Interface
This interface circuit provides electrically isolated RS485 communication inteface to the PC serial port the isolation circuit protect the PC from direct connec...
PC RS422 INTERFACE – Circuit Schematic
PC RS422 INTERFACE
This interface circuit provides electrically isolated RS422 communication interface to the PC serial port the isolation circuit protect the PC from direct conne...