Microprocessor RS-232 Reset
This circuit allows a remote microprocessor to be reset by a controlling host over a remote RS-232 or similar protocol serial line. With the use of a program lo...
Commodore 64 Keyboard Joystick & Paddle Interfaces
U1 is a Complex Interface Adapter (CIA). Both parallel ports are used to decode the keyswitches on the keyboard. Parallel port A signals (PA0 - PA7) are outputs...
Commodore 64 Cassette Interface
U7 is a 6510 microprocessor. One of the features of the 6510 is a built in parallel I/O port (P0-P5). P3 - P5 control most of the cassette interface circuitry. ...
Commodore 64 I/O ROM Expansion Port
The output F1 pin 17 of the PLA U17 goes "low" when the BASIC ROM is selected. The KERNAL ROM resides at locations $E000 - $FFFF. The output F2 pin 16 of the PL...
OpenLx USB DMX interface
This is yet another circuit for producing DMX output for entertainment lighting from a PC. Designed with flexibility in mind, a range of circuit configurations ...
Suunto PC Interface
This page contains GIF images of the circuit diagram for the Solution interface, the PCB artwork, the board layout, a typical side elevation of the assembly, a ...
Ub232r Usb Mini-b Ft232r Evaluation Module
The UDA1343TT is a single-chip stereo Analog-to-digital Converter (ADC) and digital-to-analog Converter (DAC) with basic signal processing features employing bi...
An Intel 8088 Maximum Mode Single Board Computer System
As an integral part of an advanced computer science course in microcomputer systems it was thought that students could benefit from the design of a single board...
Interface Circuits
Building circuits to interface an Amiga A1200 to a PC AT/ATX power supply and tower case.....
Adventures with a Single Board Computer
CPU NatSemi Geode 200/233/266/300 MHz (default 233 on-board) or and follow Geode link. VGA/LCD Interface NS GX5530, shared memory 2. 5MB, support CRT display an...
How to make a PC-Micro controller USART communication using AVR-Atmega8
How to transmit data between PC and AVR Atmega8 micro controller using USART module. We use COM port of PC based on RS232 protocol & UART of AVR.....
Computer Off Switch
How often does it happen that you close down Windows and then forget to turn off the computer This circuit does that automatically. After Windows is shut down t...
Simple RS 232 Level Converter
When you need connect your Microcontroller Project to COM port in PC you need RS 232 converter. There are many chip to solve the problem like MAX232, DS275 etc....
avr project i2c tiny usb
The i2c-tiny-usb project is an open source/open hardware project. The goal of i2c-tiny-usb is to provide a cheap generic i2c interface to be attached to the.....
computer-internet-software
Unplugging or re-connecting equipment to the serial COM or PS2 connector always gives problems if the PC is running. Even if you only need to swap a mouse or ch...
computer-circuits
This simple pc scope probe is nothing more than a fet follower. It has a high input impedance and a low output impedance tomatch a mic or line input socket on a...
Design Parallel Port Interface Project PCB
Circuit The following schematic shows the design of a Parallel Port Interface Circuit Diagram using 74HCT373. The 74HC/HCT373 are high-speed Si-gate CMOS device...
VGA to BNC Adapter Converter circuit
There are monitors which only have three BNC inputs and which use composite synchronization (sync on green`). This circuit has been designed with these types of...
Serial To Parallel Converter
This converter may help if just the serial port on a personal computer is free, whereas the printer needs a parallel (Centronics) port. It converts a serial 240...
Processor Fan Control
Fans in PCs can be objectionably loud. In many cases, the amount of noise produced by the fan can be considerably reduced by lowering its speed. Although this w...