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Computer Interface Circuits

Computer Interface: 
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Last Updated: October 13, 2017 03:04 AM


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

A Better Approach to Designing an RTD Interface with a Spreadsheet 18-Sep-08 EDN-Design Ideas An improved Design Ideas directly calculates component values for an RTD circuit using an Excel spreadsheet __ Circuit Design by Aubrey Kagan, Emphatec, Markham, ON, Canada

A Handy USB Breakout Box for Project Development You can build it in 10 minutes and for less than $15__ SiliconChip

A Laboratory Control System for Cold Atom Experiments We have developed a powerful yet inexpensive and easy to construct experiment control system.  The construction of the system together with the control software is described here.  All circuits and software are free to download and use for nonprofit.  The system was developed for the BEC   (Bose-Einstein condensation) experiments in the group of Mark Raizen at the University of Texas at Austin and is based on a system that one of the authors developed previously for experiments at the Ecole Normale Superieure in Paris.   __ Designed by dd Meyrath and Florian Schreck

A Low-Cost PC-to-I2C Interface for Debugging Tracking down problems in circuits which are programmed via an I2C bus can be tricky and time-consuming, unless you take advantage of a debugging program running on a PC.  Here's a low-cost, easy-to-build printer port to I2C interface designed to work with the Philips/NXP debugging program URD312.exe.__ SiliconChip

A MIDI to RS232 adapter The article contains two parts: a description of a circuit that translates the MIDI signal level to RS232 levels   (and vice versa) , and programming notes to send and receive MIDI packets.  The first part, the circuit, is general purpose --although using this converter to connect a MIDI keyboard to the serial port of your PC may require a special RS232 card.  The second part, though, is specific to the H0420 programmable MP3 player.  In fact, the article was written specifically to connect this MP3 player to a MIDI chain

A Passive Ethernet Hub I tested this concept on a little network consisting of three PCs running under Windows 2000.  It works well.  The network adapters are normal Intel and 3Com models, set to 10 Mbps and Half Duplex.  The __ Designed by Miroslav Adzic Serbia Montenegro

A 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

A PC-Controlled Burglar Alarm System Fancy a full-featured alarm control panel with dialler capabilities? This one is PC-programmed and controlled and can handle up to eight zones.  The PC only needs to be powered up for arming and disarming, or you can use an optional keypad.__ SiliconChip

A Scenix (and PIC) Programmer I was trying to think of a suitable name for this project, and after literally seconds of careful deliberation, I gave up and decided to call it Fluffy.  Sorry.  Anyway, Fluffy is a SX programmer for people who have already experimented with PIC chips, and want to try out the Scenix SX family.  I built Fluffy because I wanted to experiment with the SX's, but didn't want to spend $300 or so bucks on the official development system.  To build it, you will need a PIC16F84   (a 16C84 will probably also work, but I don't have any to test!).  Note that this implies you should already have a working PIC programmer.  If you don't, you might want to check out COM84, or any of the multitude of free, cheap PIC programmers available on the web.   __ Designed by Ben  last name not found

A Serial Infrared Remote Controller This is a simple, cheap device that can be connected to any serial port to control most components that have infrared remote controls.  I designed and built it   (on a solderless breadboard) in 1991.  In 1992 I wrote a lengthy description of it for an electronics class.  In 1994 I finally designed a PC board for it, using a free, X-based PC board design program called pcb, and in 1995 I etched several of the boards and made the final product __ Designed by John DuBois

A Single Supply RS-232 Interface for Bipolar a to D Converters DN29 Design Notes__ Linear Technology/Analog Devices

A Stroke of Genius for Smart TVs 4-Nov-15 -Design News:   In this age of the Internet of Things (IoT), connected devices are getting smarter.  We have smart phones, smart homes, smart cars, smart appliances, and even smart TVs.  But this last example begs the question:  If my TV is so smart, why is my remote control so dumb? Anyone who has tried to use a __ Gadget Freak

A Transaction Approach to Error Handling EDN-Design Ideas 04/28/94    You can apply the transaction-based recovery concept used in databases to any application.  Doing so helps provide more reusable and maintainable programs.  Programs contain two major paths: a forward path that does the work and a reverse path that rolls back the work when the program detects errors.  Typically, these paths are so tightly bound together that both paths are difficult to read.  Code that is difficult to read results in code that is difficult to write, debug, enhance, and reuse.    __ Circuit Design by Bruce A Rafnel, Hewlett-Packard Co

A Universal I/O Board with USB Interface This hardware I/O board will let you drive a host of digital and analog I/O   (input/outputs) via the USB interface on your laptop or desktop computer.  Based on an Atmel Atmega32 microprocessor and not much else, it works on Windows, Linux and Macs.__ SiliconChip

A Versatile Hybrid Synthesizer for UHF & Microwave Projects Controlled byPC parallel port, this hybrid DDS/PLL synsizer delivers full-octave coverage between 1000 and 2000 MHz with sub-1 Hz resolution and commercial-quality phase-noise performance.  

A Windows Based EPROM Programmer This new design can read the and program virtually all commonly-used EPROMs and OTPs.__ SiliconChip

A Windows-Based EPROM Programmer-Part 2 Second article gives the full assembly details & describes how to check the programmer's basic hardware operation.__ SiliconChip

A worked Stepping Motor Example Perhaps some of the most commonly available stepping motors, for the experimenter, are the head positioning motors from old diskette drives.  These can be found at electronics swap meets, in computer surplus outlets, and even in trash dumpsters.  In addition to a stepper, a typical full-height 5.25 inch disk drive includes a 12 volt DC motor with tachometer and motor control circuit board, two microswitches, and a matched LED-photosensor pair   (schematic design 6/06)  __ Designed by Douglas W. Jones

AB-5: Isolated RS485 & RS422 Advantages of NVE's IsoLoop high-performance integrated transceivers over traditional optocouplers.  

AC Power Line 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

Access odd memory locations without hardware 05/27/99 EDN-Design Ideas Some risc controllers, like the NEC V850 family, use an internal 32-bit architecture with an external 16-bit bus.  The architecture also allows interfaces with 8-bit memories.  HoweverPDF has several circuits, please scroll to find this one.    __ Circuit Design by Sorin Zarnescu, NEC Electronics, Santa Clara, CA

Accessing GPIOs using SYSfs interface of Linux A lot of development boards with different distributions of Linux are available in the embedded market. These boards come with different processors and therefore require different methods/libraries to handle their GPIOs...__ 12/29/2104 EFY

Accurate USB 2.0 temperature sensor needs only a handful of parts 05/24/07  EDN-Design Ideas A USB-to-serial converter forms the heart of an accurate USB temperature sensor __ Circuit Design by Silvio Lauckner, Ismaning, Germany

Achieve Simple Circuit IR data transmission from a PC’s serial port 10/11/07 EDN-Design Ideas By transmitting appropriate hex values from a PC's serial port to a pair of IR LEDs, a remote-control IR receiver can enable 38.4-kHz data transmission __ Circuit Design by Andreas Grün, Wedemark, Germany

Active Termination for Scsi-2 Bus App Note 34, May 1990__ Linear Technology/Analog Devices

Active-filter & oscilloscope inspect a Class D Amplifiers output 12/01/06  EDN-Design Ideas Ease debugging of bridge-output pulse-width-modulated audio amplifiers with this circuit __ Circuit Design by John Guy, Maxim Integrated Products Inc, Sunnyvale, CA

Adapt Differential Input to Drive Coax 05/08/97 EDN-Design Ideas Uses an HFA1100 or HFA1105 to convert a balanced input signal to a single-ended output signal, uses positive feedback to characteristic-impedance matching while increasing the available output swing, as compared with using a simp __ Circuit Design by Donald Whitney Jr, Harris Semiconductor, Melbourne, FL

ADC interface conditions high-level signals 30-Oct-03 EDN-Design Ideas Designers who build equipment for the industrial market share a wIdeaspread problem.  At one extreme, they must build equipment that supports ±10V bipolar voltages, often riding on a high common-mode level, a requirement enforced by 30 years of legacy industrial equipment.  At the other extreme, the analog signal needs conditioning to match the full-scale range of a low-voltage, single-supply __ Circuit Design by Moshe Gerstenhaber and Stephen Lee, Analog Devices, Wilmington, MA

Add CAD functions to Microsoft Office 03/21/02 EDN-Design Ideas Microsoft Word has excellent drawing capabilities.  You could use it effectively to perform some CAD tasks, such as schematic entry.  Word is by far the most popular text processor on the market, and it would seem desirable for technical writers to be able to create a single integrated document file combining both text and graphics in an editable format __ Circuit Design by Alexander Bell, Infosoft International, Rego Park, NY

Add current boost to a USB charger 09/19/02 EDN-Design Ideas The popular USB interface can charge a portable device while transferring data.  But for high-capacity batteries, the 500-mA output current of USB hosts and powered hubs greatly extends the charging time.     (Unpowered USB hubs supply nothan 100 mA.   ] Thus, a system that accepts charging power from an ac adapter as well as the USB port isconvenient __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Add Simple Circuit disable function to a panoramic-potentiometer 02/15/07  EDN-Design Ideas Improved control circuit places monaural image in a stereo field __ Circuit Design by Lawrence Mayes, Malvern, United Kingdom

Add speech encoding/decoding to your Design 02/04/99 EDN-Design Ideas   (Scroll to find this one)  Adding speech capabilities to a design can sometimes lead to complex algorithms and expensive DSPs or specialized audio chips.  However, with  completion of a simplified adaptive differential pulse-code-modulation  (ADPCM]algorithm, you can now implement se audio capabilities in low-cost 8-bit µCs, which typically.   Page includes several designs.   __ Circuit Design by Rodger Richey, Microchip Technology Inc, Chandler, AZ

Add switch-and-LED I/O to DSPs serial port 05/07/98 EDN-Design Ideas   (file contains multiple circuits scroll to find this one.)When you debug an embedded DSP design, it's handy to have a bank of switches and LEDs to simulate inputs or to display intermediate results.  You can attach 16 switches an __ Circuit Design by Stan Sasaki, Twenty-First Designs, Lake Oswego, OR

Add voice command to virtual instrumentation 05/30/02 EDN-Design Ideas Debates still persist in the engineering community about the relative merits of analog and digital controls of instrumentation.  Meanwhile, a revolutionary new type of control—voice-command control—is gaining acceptance in many application areas  (Reference 1].  This design idea focuses on the practical implementation of the Voice Commander voice-command interface in a virtual-instrume __ Circuit Design by Alexander Bell, Infosoft International Inc, Rego Park, NY

Add voice commands to your CAD system 05/02/02 EDN-Design Ideas The first time I activated the Language Bar  (Speech Tools] in my Microsoft Word 2002 and started dictating this Design Idea, the on-screen title displayed "cat" instead of "CAD.   " By using the "Add/Delete Words" feature, I've trained the system to recognize the "CAD" acronym.  This was my first experience with the MOSR  (Microsoft Office Speech Recognition] tool, which is part of the latest Micros __ Circuit Design by Alexander Bell, Infosoft International, Rego Park, NY

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