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Computer Interface Circuits

Computer Interface: 
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Last Updated: October 18, 2017 05:04 AM

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

F84 Miniature Real-Time Controller Build a simple real-time controller with PIC16F84 running at low power X-tal 32, 768Hz.  Daily scheduler for 6-channel resided in 64-byte EEPROM can easily be pre-programmed using Nigel PicProg __ Designed by Wichit Sirichote

F84-Programmer Build a low-cost and very simple serial programmer for a PIC16F84 Microchip Flash Microcontroller.  Below picture is my personal writer for F84 chip, it works very nice with Nigel WPicProg V1.20.   __ Designed by Wichit Sirichote

Fabricate a High-Resolution Sensor-To-USB Interface 11/17/11  EDN-Design Ideas A precision analog acquisition system fits in your pocket.  The circuit in this Design Idea combines a mixed-signal microcontroller, a USB UART (universal asynchronous receiver/transmitter), and a novel adaptable analog sensor-input circuit.  It allows you to connect many types of sensors to the design’s two analog-input channels, control the device, and read measurement data on a USB host. __ Circuit Design by Zoltan Gingl, University of Szeged, Szeged, Hungary

Fake Joystick The following very simple circuit can be used to make the computer to think that there is a real joystick connected to joystick port.  This adapter might be useful in some special computer testing applications when you don't have real joystick available __ Designed by Tomi Engdahl

Fan Thermostat Build a simple fan thermostat with LM35, ADC0804 and 89C51.   __ Designed by Wichit Sirichote

Fast, compact routine interfaces EEPROM to µC 03/04/99 EDN-Design Ideas (Scroll to find this EDN    Design Idea)  __ Circuit Design by Grzegorz Mazur, Institute of Computer Science, Nowowiejska, Poland

Fast-settling picoammeter handles wide voltage range 09/14/06  EDN-Design Ideas Versatile circuit converts picoamperes to millivolts __ Circuit Design by Rob Whitehouse, Analog Devices, Wilmington, MA

Fax to Modem Interface The circuit can be easily built to a small plastic box with telephone connectors in both ends.  The circuit takes about 10-20 mA current, so if the circuit is not in use all the time it is best to use batteries.  You can also use small wall transformer to power the circuit.  Remeber to take a wall transformer which gives good quality output (regulated model preferred) ,  __ Designed by Tomi Engdahl

Feeling Comfortable with Logic Analyzers Application Note__ Aligent

Filter Solutions PC windows based filter synthesis and analysis software.   __ Designed by Tony van Roon  VA3AVR

Finding Transistor Pins Use a cheap needle multimeter to find transistor pins.   __ Designed by Wichit Sirichote

FIR filter scheme saves ROM storage space 05/11/95 EDN-Design Ideas You can easily implement single-bit FIR filters using ROM look-up tables, which allows you to avoid costly multiplier accumulators.  Unfortunately, as filter order increases, so does the size of the ROM.  Fig 1 shows how you can reduce the storage requirement for larger-order filters.  The following difference equation defines an N-tap FIR filter, where y (n) , x (n-m) , and h (m) are, respectively, the output sequence, the input sequence delayed by m samples, and the impulse response (coefficients) of the filter: __ Circuit Design by CA Jalaludeen, Defence R&D Organisation, Kochi, Kerala, India

Firmware Based Protocol for Low Priority Data Transfer The DS protocol was designed to provide firmware-based bidirectional host-to-slave inter processor communications for situations in which no hardware solution is available and the host and/or the slave in incapable of tending the interface in real time.  The only specialized hardware required is two bidirectional I/O ports on each chip (alternatively two input ports and two tri-statable output ports may be used).   __ Designed by Dick Cappels

First steps with the PIC32 Ethernet Starter Kit Add ethernet connectivity your projects, get started with the Microchip Ethernet Starter Kit quickly.  This guide shows how to setup the MPLABX development environment for compiling PIC32 source code and the TCP/IP stack __ Designed by Peter Jakab

First Z80 CPU system My First Z80 CPU system __ Designed by Thomas Scherrer OZ2CPU

Fixture Determines Leakage of Capacitors & Semiconductor Switches 06/06/07 EDN-Design Ideas The low input-bias current of a voltage-follower op amp allows this simple fixture to measure the leakage current of capacitors and reverse-biased active devices.   __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

FM Beacon Transmitter (88-108 MHz) This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes.  Circuit draws about30 mA from a 6-9 volt battery and can be received to about100 yards.   __ Designed by Bill Bowden

FM radio for a PIC (uses TDA7000 IC which is noW obsolete) Scchematic only __ Designed by Kyriakos Kontakos

Force/sense connection eliminates multiplexer on-resistance error 22-Jan-04 EDN-Design Ideas Digitally controlled gain is an everyday analog-design element.  You frequently find this element in an op-amp-based, transimpedance current-to-voltage converter.  When you design digital gain control into such a converter, the usual scheme is to arrange things such that a digital multiplexer selects the appropriate feedback resistor for each gain figure __ Circuit Design by Stephen Woodward, Marine Sciences, Chapel Hill, NC

Four Channel 8 Bit Analog-to-Digital Converter for PC This is an extremely simple ADC for the PC.  It connects to the parallel printer port, and runs from a 9V battery.  All parts are available from Digi-Key.  

FPGA Emulates 74X74 Flip-Flop 10/12/95 EDN-Design Ideas The Xilinx 4000 Series FPGA library contains a D-type flip-flop with either asynchronous preset or clear, but not both.  The circuit in Fig 1 provIdeas both functions, thereby eliminating the need to use discrete 74X74 ICs.  The circuit consists of a set flip-flops, two reset flip-flops, a 4:1 multiplexer(of which you use only two channels], and a few logic gates.  If either PR __ Circuit Design by Keith Gomarac, AIL Systems, Lancaster, CA

FPGA implements X.50 Division 3 recommendation 04/13/00 EDN-Design Ideas The scheme in Figure 1a uses five delay cells and an XOR gate to configure the data stream for the X.50 Division 3 recommendation of ITU-T.  The X.50 recommendation defines the fundamental parameters of a multiplexing scheme for interworking data __ Circuit Design by Andres Martinez, Alcatel, Ramirez de Prado, Spain

Frequency dithering enhances high-performance ADCs 08/18/05 EDN-Design Ideas Modification of dithering principle respects A/D characteristics __ Circuit Design by Steve Hageman, Windsor, CA

Frequency Meter Mains frequency is pretty stable and it is unlikely that you have to measure it but if you have an emergency generator you might find this circuit useful as it will give an indication whether the generator is running too fast or too slow.  Actually you can use the mains frequency to calibrate

Frequently Asked Questions About Data Converters App Note/ 801 / Jul-06__ Maxim Integrated

FSK Modem with PIC16C84 schematic only __ Designed by shaunwilson19 @ yahoo.com

FSK Modulator Enables Data Transmission Over Low-Speed Link 06/11/09 EDN-Design Ideas Send digital data over a low-speed link.  FSK (frequency-shift keying) is a type of signal modulation for transmitting digital data over an analog communication link.  An FSK modulator comprises a digitally controlled sine-wave generator whose frequency shifts between two predetermined frequencies in response to the two logic levels of the digital data.  The circuit in Figure 1 generates a sine wave by continuously sampling a single sine cycle.  The output of IC2A is proportional to the currents through R1, R2, and R3.  These resistors connect together at one end to the inverting input of IC2A, which is biased at VCC/2.   __ Circuit Design by Israel Schleicher, Prescott Valley AZ

FT232 USB Interface Adapter Control up to three devices from a PC with FT232 IC (USB to Serial UART) from Future Technology Devices International FTDI.  Circuit is simple and does not require external microcontroller or any type of firmware programming.  PC control software written in VB6 is included.  

Gal Programmer This is a simple GAL programmer that can be controlled with PC's parallel port.  Its supported devices are Lattice GAL16V8/20V8/22V10 and versions of A through D.  Now added a new function of PIC programmer.   __ Designed by The Electronic Lives Manufacturing-presented Chan

Game Boy Camera PC Serial Interface The results of their conversion are seen in Figure 2, which was obtained using the supplied evaluation software.  The supplied evaluation software can also be used to view FFT data (Figure 3) as well as a histogram for codes at a fixed dc level (Figure 4)

Game boy camera PC serial interface The results of their conversion are seen in Figure 2, which was obtained using the supplied evaluation software.  The supplied evaluation software can also be used to view FFT data (Figure 3) as well as a histogram for codes at a fixed dc level (Figure 4)

Gbytes squeeze onto 3-in. disk drive 11/21/96 EDN-Design Feature   Intégral just became the second disk-drive vendor to announce support for the 3-in.  disk-drive form factor that JTS Corp (San Jose, CA) champions.  The companies claim that the added disk surface area available on 3-in.  media makes the drives a superior price/capacity choice to 2.5-in.  drives for applications such as notebook computers (see "Disk drives at 40: lean, mean storage machines," EDN, Nov 7, 1996, pg 51). __ Circuit Design by Maury Wright   Intégral Peripherals Inc, Boulder, CO

General purpose ISA interface card for PC This circuit came from Bruce Eckel's excellent article in the Sep/Oct 1988 issue of Micro Cornucopia.  It's been the foundation of most circuits I've connected to a PC's ISA bus.  It performs basic I/O port address decoding and data bus buffering, and works well as a building block for more complex circuits and software that use hardware IRQs and DMA to move data. __ Designed by Aaron Logue

General-Purpose Components Implement USB-Based Data-Acquisition System 26-Jun-08 EDN-Design Ideas A serial ADC communicates with a PC's USB port through a serial-to-parallel converter and a USB-interface IC __ Circuit Design by V Gopalakrishnan, Indira Gandhi Centre for Atomic Research, Kalpakkam, India

Generating Low Duty-Cycle Pulses with a Function Generator (5988-7507EN): Aligent Application Note Application Note__ Aligent

Get Four Colors from 2 Bits 08/12/10 EDN-Design Ideas Using a three-color LED, you can get red, green, blue, and mixtures such as white light.   __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Get just enough boost voltage 27-May-04 EDN-Design Ideas Adding a current-mirror circuit to a typical boost circuit allows you to select the amount of boost voltage and to ensure a constant difference between the input and the output voltages(Figure 1).  This circuit is useful for high-side-drive applications, in which a simple voltage doubler is unacceptable because of the voltage range of the components involved or where the input voltage can vary __ Circuit Design by Kieran O'Malley, On Semiconductor, East Greenwich, RI

Get Power Out of PC Parallel Port An article which includes circuits, shares how to us a parallel port to connect to a very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many circuits.   __ Designed by Tomi Engdahl

Get Power Out of PC Parallel Port This text tries to clear out the mystery of how to get power out of PC serial power.  There are quite many small circuit which take all their operating power from serial port, where there are no real power output pin.  Examples for this type of circuits are PC mouse and software protection dongle.  You might wonder how this is possible. __ Designed by Tomi Engdahl

Get power out of PC RS-232 port An article which includes circuits, shares how to us a parallel port to connect to a very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many circuits.    __ Designed by Tomi Engdahl

Getting the Internet on His Watch 23-Feb-04 -Design News:   When he found a bunch of surplus miniature, alphanumeric LED displays, he knew he had the makings of a watch-but how far to go? Adding a barometer, altimeter, and temperature sensor makes it a perfect outdoor accessory.  The coup de grace is the Trippy Bits / four letter word function-random bits __ Gadget Freak

Glossary of Frequently Used High Speed Data Converter Terms App Note/ 740 / Aug-06__ Maxim Integrated

Gold Wafer Smartcard Programmer Using the software CHIP-CAT 2.0, the flash and the external EEprom of various smrartcards can be written.   __ Designed by Mail @ MAKInterface.de

GPS receiver (Gamin, Eagle etc) to PC interface cables GPSy (TM) has extensive documentation on how to create your own data cables, and if you are handy with a soldering iron (or know how to use crimp connectors) , there are some instructions.   __ Designed by ©  Global Mapping Systems and Karen Nakamura

Graphical Alarm Clock (Below is a video of some of the features of the clock.  Portions of the video are a little blurry, but that is due to the web cam and not the display of the clock) Launch in external player Why build the electronics of a clock? Well, 

Graphics Controller Handles Interleaved Memory 02/16/95 EDN-Design Ideas The Intel 82786 graphics controller does not generate a proper data-transfer cycle if your video RAM (VRAM) is organized into two interleaved banks (Fig 1).  The circuit in Fig 2 overcomes this device's deficiency. __ Circuit Design by YS Tam, Canadian Marconi Co, Kanata, ON, Canada

Greek telecard reader This telecard reader can read the contain of any  telecard until 64 bytes (512 bits) and display it  to  hyper terminal software, using RS232 port __ Designed by © Vassilis Serasidis

Ground-free DVM Module Supply from 5 V NOTE : Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Group Delay Equalizer has Gain More than One 10/12/95 EDN-Design Ideas For numerous applications, flat group delay (linear phase) is necessary to maintain system performance.  The common group-delay equalizer of Fig 1a has unity gain and is a popular way to equalize data filters or alias filters when phase compensation is necessary.  The alternative equalizer of Fig 1b, however, can provide a gain greater than one for systems that require additional gain (and when providing that gain elsewhere is impossible or impractical).    __ Circuit Design by Mark Weigel, Scottsdale, AZ


Computer Interface:  #'s         A -  B        C -  E
        F -  H        I -  L         M -  P        R  - T       U  - Z


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