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Computer Interface Circuits

Computer Interface: 
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Last Updated: December 01, 2017 03:24 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

PC Card Power Management Techniques DN76 Design Notes__ Linear Technology/Analog Devices

PC communicates with AD 2101 DSP µP 01/19/95 EDN-Design Ideas By using a cheap, readily available MOSFET, you can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power.  In Fig 1, the switch simply controls the MOSFET gate, which switches on the negative supply.  Resistor R, which can be several __ Circuit Design by C A Jalaludeen, Defence R&D Organisation, Kochi, Kerala, India

PC Controlled Relays A popular design with dozens of applications.  The design is simple and compact.  Switch almost everything on and off with a simple mouse click.  Some tech specs: relay outputs, on-board power regulator, on-board serial port.   __ Designed by Projects & Ideas from Nutchip.com

PC Controlled Voltage or Current Source If you are interested in model aeroplanes and have the capital, a radio controlled electric park flyer is a must have.  An RC aeroplane under 400 grams floats around like the rubber models of my youth and contact with the ground doesn't seems to involve that sickening crunch __ Contact: r dot p @ webone.com.au

PC Controls Inexpensive Waveform Generator 6-Jun-96 EDN-Design Ideas The circuit in Figure 1 is a simple cost-effective waveform generator using PC control.  You calculate the digital image of the desired waveform and store it in the 32k X 8-bit RAM(62256] through the 74HCT245 data buffer and the 16-bit local-address bus generator built with the 74LS393 binary counters __ Circuit Design by J Jayapandian, Indira Gandhi Centre for Atomic Research, Tamil Nadu, India

PC controls light dimmer 08/19/99 EDN-Design Ideas Control one light dimming from PCUsing the simple circuit in Figure 1 , you can control the light intensity in your room or work area from your PC.  The heart of the circuit is a low-power D/A converter that converts digital words from a computer's parallel port to analog-voltage signals.    __ Circuit Design by Afshin Mellati

PC Electrically Isolated RS422 Interface using SN75176B or MAX485 This interface circuit provides electrically isolated RS422 communication interface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages.   __ Designed by M Asim Khan asimkhan @ sat.net.pk

PC Electrically Isolated RS485 Interface using MAX487 or SN75176B This interface circuit provides electrically isolated RS485 communication inteface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages.   __ Designed by M Asim Khan asimkhan @ sat.net.pk

PC Games Port Tester So your joystick dosen't work? Is it the games port, a software problem or the joystick itself? This simple device will tell you if the games port is OK.__ SiliconChip

PC hardware Monitor reports the weather 01/18/01 EDN-Design Ideas You usually use PC hardware monitors to keep a close eye on powersupply voltage levels, the speed of system cooling fans, and even the temperature of the CPUPDF has several circuits, scroll down.    __ Circuit Design by Sean Gilmour, Analog Devices, Limerick Ireland

PC I Express Power & Mini Card Solutions DN346 Design Notes__ Linear Technology/Analog Devices

PC I PIO Board An experiment of the PCI board to build with generic parts, such as a GAL and TTL logics.  PCI is a industrial standard bus on the parsonal computers.  But nobody tries to build the PCI board personaly, so I tried it.  And it had been completed with successful :-)  __ Designed by The Electronic Lives Manufacturing-presented Chan

PC Interface for Point Controller Schematic only

PC ISA board containing a Z80 microprocessor (coprocessor card) This thing has a 2.5 Mhz Z80A, an 8K RAM chip, and some glue logic to permit software on the PC to fill the RAM with Z80 code and data, let it run, and come back later to fetch the fruits of the Z80's labor.  With this baby in my PC, I can write parallel processing programs that increase performance by, uh, well, by a margin that may be measurable! __ Designed by Aaron Logue

PC ISA Card Random Number Generator The purpose of this card is to provide a source of cryptographically secure random numbers to a host PC.  The card can operate in either polled or interrupt mode.  Some other pages here provide more detailed information on ISA bus interfacing, getting started with SX microcontrollers, and the theory behind the random number generator circuit. __ Designed by Aaron Logue

PC MCIA Card & Card Socket Power Management AN60 Most portable systems have expansion sockets conforming to the standards set by the Personal Computer Memory Card International Association (PCMCIA).  This standard requires the host to perform an unusual amount of switching on both the VCC and VPP voltage lines.  Card designers face difficult power management and DC/DC conversion issues of their own.  Board real estate and component height are at a premium making design difficult and component selection critical.  This App Note discusses in detail both the host and card designer issues and highlights several new products designed specifically for these applications.  __ Linear Technology/Analog Devices

PC MCIA Socket Voltage Switching Design Note 93 DN93 Design Notes__ Linear Technology/Analog Devices

PC Monitors two-way RS-232 transmission 02/01/01 EDN-Design Ideas The goal of monitoring transmission in a data link is obvious: You want to know the contents of the data, when it was sent, and by whom.  If one of the communicating parties is a PC or another user-programmable controller, then you can modify parameter settings or, at worst, change transmission routines to generate log files or perform other actions.   __ Circuit Design by Jerzy Chrzaszcz, Warsaw University of Technology, Poland

PC Multimedia Speakers This circuit of multimedia speakers for PCs has single-chipbased design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance.At the heart of the...__ Electronics Projects for You

PC parallel port eight DC power switch cam driver two unipolar stepper Motors, lights etc On this circuit there are eight DC power switch you can open or close through PC parallel port: you can use it to drive two unipolar stepper motor or eight electric light bulb or DC motors.  Digital interface to PC uses optocouplers for safety reasons and you can connect up to six circuits to a single LPT, driving up to twelve step motors or 48 bulb: see iso-buffer for an in deep description. __ Designed by © Vincenzo Villa

PC Parallel Port Output Capabilities includes instructions how to connect a relay to PC parallel port __ Designed by Tomi Engdahl

PC Parallel Port Wizard This simple gizmo can test your PC's parallel port.  It can also teach you a lot about the way parallel ports operate.__ SiliconChip

PC Printer Port Controls Frequency Divide 06/09/94 EDN-Design Ideas In Fig 1's circuit, two cascaded synchronous presetable binary counters, IC1 and IC2, can derive signals having a frequency of fCLK/N.  In the circuit, a simple oscillator generates fCLK; however, you can substitute any triggerable source. __ Circuit Design by Bogdan Manolescu, Microelectronica, Bucharest, Romania

PC Printer Port Controls I V Curve Tracer App Note/ 253 / Nov-07) __ Maxim Integrated

PC Printer Port Programs AT89C5 EDN-Design Ideas 10/24/96    The simple PC printer-port interface programmer in Figure 1 can program an Atmel AT89C51 flash-based mC.  The circuit uses the eight data-port lines (pins 2 to 9) and three control-port lines (pins 1, 14, and 16).  The control-port bits, D0 and D1, act as reset and clock signals, respectively, for the 12-bit binary counter, IC2.   __ Circuit Design by Hong Yu Qing, TD Inc, Tongling, China

PC Programs PROM Simulator 01/20/94 EDN-Design Ideas The circuit in Fig 1 emulates 8-kbyte PROMs, such as the 2764.  The programs in Listings 1 and 2 allow you to download a PROM program to the emulator via a PC's serial port.    __ Circuit Design by Shwang-Shi Bai, Chang-Shan Institute of Technology, Taiwan, ROC

PC records four-channel waveforms 05/25/00 EDN-Design Ideas This design idea     is a sequel to a previous one, "Use a printer port to record digital waveforms, " EDN , June 18, 1998, pg 136.  Both ideas are similar: Use the PC's printer port to sample waveforms, and use the PC's memory to stor __ Circuit Design by Dean Chen, Dycam Inc, Chatsworth, CA

PC RS422 Interface Isolated RS422 adapter for PC serial port by M Asim Khan, Pakistan.   __ Designed by Wichit Sirichote

PC RS485 Interface Simple and easy build RS232C-RS485 converter designed by M Asim Khan, Pakistan.   __ Designed by Wichit Sirichote

PC 's printer Port measures frequency 10/26/95 EDN-Design Ideas You can plug the circuit in Fig 1 into a PC's printer port to measure frequency.  The circuit needs no external power supply, measures frequencies from 1 Hz to 5 MHz, and displays the results on screen.  IC1 (CD4536) is a 16- or 24- __ Circuit Design by Yongping Xia, EBT Inc, Torrance, CA

PC 's RF stage Design: tackling the trade offs 11/21/96 EDN-Design Feature   Building Effective RF design requires that you carefully manage trade-offs.  You'll have to accept less-than-optimum performance in some dimensions to achieve your primary objectives.    __ Circuit Design by Bill Schweber, Technical Editor

PC 's Serial Port Controls Programmable Sine Wave Generator 01-Oct-06 EDN Europe This design idea describes a circuit that uses a PC’s serial port to control a sine-wave generator that covers a frequency range of 2 Hz to 20 kHz in 1-Hz steps(Figure 1).  The circuit’s output voltage of approximately 2.2V p-p remains __ Circuit Design by Yongping Xia, Navcom Technology, Torrance, California

PC Securely Controls Relay 11/23/95 EDN-Design Ideas When a PC-driven solid-state or electromechanical relay controls external equipment, take care to design an interface that avoids false triggering.  The interface circuit in Figure 1a switches the relay on and off only after a specific sequence of outputs.  Thus, this design protects the relay against the influence of computer-reset and I/O operations that some drivers perform during system start-up to locate add-on cards __ Circuit Design by Jerzy R Chrzaszcz, Institute of Computer Science, Warsaw University of Technology Warsaw, Poland

PC Serial Port Drives 12 Bit A/ D Converter App Note/ 151 / Dec-07) __ Maxim Integrated

PC serial port parastic Mode interface for 1-wire DS18S20 & similar 1-wire temperature sensors This page describes the electronic circuitry required to interface to the temperature sensors via a PC's serial port.  Both circuits shown below are implementations of Maxim/Dallas' reference DS9097U 1-wire serial port interface. 
 __ Designed by Martin Pot

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