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Computer-speech-synthesizer – Circuit Schematic
Computer-speech-synthesizer
This text-to-speech converter is built around the SP0256-AL2 speech processor and the Cf6256AL2 text-to-speech converter chips~manufactured by General Instrume...
Coprocessor-socket-debugger – Circuit Schematic
Coprocessor-socket-debugger
The IBM PC debugger plugs into the PC"s math-coprocessor socket.The 8288 bus controller, IC1, regenerates control signals from the processor"s status signals, ...
Rgb-blue-box – Circuit Schematic
Rgb-blue-box
The RGB blue box turns your PC"s RGB-monitor screen blue at the flip of a switch. That is, it makes your computer display bright white text on a blue backgro...
Interface – Circuit Schematic
Interface
Circuits to interlace the Si7135 directly with two popular microprocessors are shown in Figs. 18-2a and b. The 8080/8048 and the MC6800 families with 8-bit wor...
High speed paper tape reader – Circuit Schematic
High speed paper tape reader
When computer peripheral equipment is interfaced, it is convenient to work with logic signal levels. With a nominal 4 V at the output dropping to - 0.6 V on ill...
Data separator – Circuit Schematic
Data separator
The data separator is intended for use with 8" flexible diskettes with IBM 3870 soft sectored format. The circuit delivers data and clock (B) and clock pulses (...
Parallel Port Interface with relay – Circuit Schematic
Parallel Port Interface with relay
Below are three examples of controlling a relay from the PC's parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the ...
Data recieving from printer Port LTP1 – Circuit Schematic
Data recieving from printer Port LTP1
The diagram below shows 5 switches connected to the 5 input lines of the parallel port. An external 5 volt power supply is used to provide high logic levels to ...
RS232 reciever schematic – Circuit Schematic
RS232 reciever schematic
This circuit was designed to control a 32 channel Christmas light show from the PC serial port. Originally designed with TTL logic, it has been simplified u...
SmartCard adapter / interface for PC – Circuit Schematic
SmartCard adapter / interface for PC
This smartcard adapter follow exactly the specification ISO 7816. Also, the protocol is the "asynchronous half duplex T=0 protocol" with "active low reset" and ...
Power from PC's RS-232 circuit – Circuit Schematic
Power from PC's RS-232 circuit
The following circuit is an example how to get power from RS-232 serial port. It gives regulated +5V power for logic circuits and also unregulated positive and ...
PC parallel port Null Printer Adapter – Circuit Schematic
PC parallel port 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 ...
DVI to PAR digital video interface with LCD – Circuit Schematic
DVI to PAR digital video interface with LCD
This page describes a cheap and simple yet flexible HDMI to parallel 3.3v interface. This allows to connect most LCDs frames to the beagleboard without any furt...
Ethernet board for C64 and SX-64 – Circuit Schematic
Ethernet board for C64 and SX-64
Once i had my SX-64 repaired i wanted to do something cool with it. I learned about people who added ethernet interfaces to their C64 and since i had some spare...
i2c interface to USB interface – Circuit Schematic
i2c interface to USB interface
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 usb...
LCD to USB interface – Circuit Schematic
LCD to USB interface
LCD2USB is a open source/open hardware project. The goal of LCD2USB is to connect HD44780 based text LCD displays to various PCs via USB. LCD2USB was meant to b...
Equipment controller with PC – Circuit Schematic
Equipment controller with PC
Here is a circuit for using the printer port of a PC, for control application using software and some interface hardware. The interface circuit along with the ...
IR remote control for PC – Circuit Schematic
IR remote control for PC
This simple circuit allows you to record any IR remote control signal on your PC, and then play it back. This is particularly useful if you want to control appl...
Dive Computer interface RS232 – Circuit Schematic
Dive Computer interface RS232
This circuit represents a Dive computer interface for RS232. Uses the MAX232A....
PC thermometer schematic – Circuit Schematic
PC thermometer schematic
This incredibly simple thermometer plugs on any free serial port. Does not make use of any programmable components as microcontrollers. It gives temperature rea...