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Computer Interface Circuits

Computer Interface: 
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Last Updated: October 24, 2017 02:54 PM


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

Simplified PC Connections for Gpib Instruments Application Note__ Aligent

Simulate input-offset current for current mirrors 24-Jun-04 EDN-Design Ideas Simulating the output-offset current of a current mirror is straightforward.  You simply have to apply an input current, measure the output current, and calculate the difference.  This output-offset current, however, is not equal to the input-offset current, especially when the circuit is not a 1-to-1 mirror __ Circuit Design by Johan Bauwelinck, Gent University, Gent, Belgium

Single µC pin makes half-duplex RS-232C 08/05/99 EDN-Design Ideas In many µC designs, nearly all the I/O pins are occupied.  If only one I/O pin is available, the circuit in Figure 1 can help you implement a serial RS-232C interface.  For many purposes, half-duplex operation using a software-driv __ Circuit Design by Marin Ossman

Single board supports two bus widths 01/04/96 EDN-Design Ideas The design in Figure 1 allows for a single board to support both an 8- and a 16-bit bus width.  The 8-bit Am186EM µC would use both SRAMs and have0 Ohm resistors or jumpers connecting A17 and WHB to the SRAMs.  __ Circuit Design by John Hansen, Advanced Micro Devices Austin, TX

Single Interface Chip Controls Two Smart CarDS DN289 Design Notes__ Linear Technology/Analog Devices

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

Single wire connects microcontrollers 10/22/98 EDN-Design Ideas   (File has several circuits, scroll to find this one)  Low-cost µCs, such as Motorola's 68HC705 Series, offer great simplicity at the expense of some useful functions—notably, serial data transmission __ Circuit Design by Abel Raynus, Armitron International, Melrose, MA

Single-wire keypad interface frees microcontroller-I/O pins 31-Mar-05 EDN-Design Ideas Using this interface topology, you can reduce the number of keypad interface wires to just one and thus save critical microcontroller I/O ports __ Circuit Design by Israel Schleicher, Prescott Valley, AZ

Small mezzanine-board format offers More I/O 04/01/99 EDN-Design Ideas NOTE :  File contains many designs.   Scroll to this one.   You can now get both modules and carrier boards for the PC-MIP mezzanine format.  MEN and SBS-Greenspring(now called SBS Technologies] developed the format as a smaller alternative to PMC modules and lets you put six PCI-based modules on any CompactPCI, PCI, or VME motherboards.  Motorola sponsors the format, and about 20 companies now support it.  PC-MIP uses an unaltered PCI bus Page includes several designs __ Circuit Design by Graham Prophet

Smart Battery Charger This unit was constructed in the shell of a Radio Shack battery charger.  The original unit charged only one type of battery at a time and only in pairs.  This unit allows for mix and match for AAA, AA, C, and D cells.  Each battery is individually monitored and charged.  An LED for each one flashes to show the current charging condition as follows[list:68e9b49a6d]Dim with bright flash: No battery detected Solid on: Battery charging Blinking on: Battery charged[/list:u:68e9b49a6d] When a battery is first inserted, a small charge is pulsed to it.  In between the pulses, the battery is __ Designed by © 2006 Luhan Monat

Smart Laptop Docking Station You can easily convert your ordinary docking station into a smart electronic laptop docking station with anti theft alarm.  The add-on sensor circuit required for this is built around IC CNY70 (IC1)...__ Electronics Projects for You

Smartcard PC Emulator 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 "inverse convention" as defined in this standard.   __ Designed by Markus Kuhn

SMBus Accelerator Improves Data Integrity-Design Note 193 DN193 Design Notes__ Linear Technology/Analog Devices

Soft limiter for oscillators uses emitter-degenerated differential pair 10/12/06 EDN-Design Ideas Phase-shift network plus a few active components yields low-distortion outputMost oscillator circuits include a nonlinear amplitude control that sustains oscillations at a desired amplitude with minimum output distortion.  One approach uses the output sinusoid's amplitude to control a circuit element's resistance, such as that of a JFET operating in its triode-characteristics region.  Another control method uses a limiter circuit that allows oscillations __ Circuit Design by Douglas Sudjian, Resonext Communications Inc, San Jose, CA

Soft-Start Module Simple circuit that reduces surge current on start of an induction motor.   __ Designed by Wichit Sirichote

Software Implements Digital Potentiometer 06/08/95 EDN-Design Ideas In some applications (for example, dynamic biasing of laser diodes) , the use of digital potentiometers, or trimDACs, has limitations because of resolution, accuracy, or interface difficulties.  Using the simple (but maybe not so obv __ Circuit Design by Gray Creager,  Xicor Inc, Milpitas, CA

Software makes full use of 8051's interrupt system 12/06/01 EDN-Design Ideas The program in Listing 1 uses a pseudo-RETI instruction to provide a five-priority-level interrupt system for the 8051P microcontroller.  The interrupt-priority order, from high to low, is INT0 IT0 INT1 IT1 INTP.  Before the pseudo-RETI instruction arrives in the IT0 or IT1 interrupt-service routine, the address of the first instruction, which is after the pseudo-RETI instruction, goes ba __ Circuit Design by Deng Yong, Shanghai Jiaotong University, China

Software PLL locks VCXO to reference 08/01/98 EDN-Design Ideas (File has several circuit ideas.  Scroll to find this one.)   The circuit in Figure 1 provIdeas a precisely controlled clock signal.  The method modifies the controller's quartz oscillator such that the control voltage at point P1 controls the frequency.  A D/A converter using an R-2R ladder network connected to output port D generates the control voltage.  A precise reference-frequency signal connects to the controller's analog-comparator input, AIN0.  In this application, the reference frequency is 162 kHz (derived from a long-wave broadcast station).  You can use any other 10- to 200-kHz frequency.   __ Circuit Design by Martin Ossmann, Philips Research Labs, Aachen, Germany

Software provides interrupt system for 8052 11/23/00 EDN-Design Ideas By using a “pseudo-RETI” instruction, the program in Listing 1 provIdeas a three-priority-level interrupt system for the 8051 mC.  Among the three interrupt sources in the routine, external Request 0(INTO) hasPDF contains multiple circuitsscroll to find this circuit __ Circuit Design by Deng Yong, Shanghai Jiaotong University, China

Software provides three-priority-level interrupt for 8051 09/14/00 EDN-Design Ideas By using a pseudo-RETI instruction, the program in Listing 1 provIdeas an 8051µC with a three-level-priority interrupt system.  Among the three interrupt sources in the listing , External Request 0 (INT0) has the highest priority, and Internal Time/Counter 0 (IT0) has the lowest priority.   __ Circuit Design by Deng Yong, Department of Instrumentation Engineering, Shanghai Jiaotong University, Shanghai, China

Software routine minimizes large logic table 07/03/97 EDN-Design Ideas You can define combinatorial logic circuitry by explicitly stating the output patterns that result from particular input patterns.  Such behavioral description is sometimes more convenient than writing logic equations; virtually all logic-design systems accept table entry, among other entry formats.  Unfortunately, limitations of allowable table size preclude direct minimization of large logic tables.  The technique proposed here uses Espresso, a public-domain logic minimizer available from the University of California--Berkeley. __ Circuit Design by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland

Software routine stabilizes hardware register 07/18/96 EDN-Design Ideas Microprocessor peripheral devices with multibyte registers often harbor a subtle bug that can bite the unwary software engineer.  If your program reads the peripheral device's registers at the same time that the device is updating those registers, the program can obtain a mixed result.  One or more of the bytes could be left over from a previous reading,  __ Circuit Design by Greg Young, Z-World Engineering, Davis, CA

Software snippet provides improved subset-sum algorithm 09/25/03  EDN-Design Ideas The subset-sum problem is one of the most frequently occurring NP(nondeterministic, polynomial-time]-complete] problems.  It asks whether a subset of numbers in a set of positive integers adds up exactly to a given value.  A relaxed version of the problem tries to identify a subset of numbers that adds up to a maximum value no greater than a given value __ Circuit Design by Ivan Basov, Brandeis University, Waltham, MA

Software speeds 8051 RS-232C receiver 12/04/97 EDN-Design Ideas This method allows for receiving data from a half-duplex, 9600-bps or faster serial link in an 8051-based system without using a hardware UART.  The method's goal is to minimize performance degradation that software-service routines incur.  Bit-cell time for 9600-bps transmission __ Circuit Design by Jerzy Chrzaszcz, Warsaw University of Technology, Poland

Solar Charged LED Utility Light Tired of always spending money on flashlight batteries only to have them fail just when you need them? Try this simple circuit out.  It would make an excellent science fair project.  The white LEDs are quite bright, they provide enough light to illuminate a small room at night.  The LEDs produce a nicely focused beam.  You can read by the light of this device.   __ Designed by G. Forrest Cook

Solar Energy Meter Simple project that turns 8051SBC to be a dedicated instrument for measuring the amount of energy produced by photovoltaic power system.   __ Designed by Wichit Sirichote

Solar Powered Reading Lamp The goal of this project was to produce a self contained reading lamp that could be used by students in developing countries for reading at night.  The circuit can be used for a wide variety of lighting applications __ Designed by G. Forrest Cook

Solar Recorder The PIC Solar recorder for daily insolation measurement.   __ Designed by Wichit Sirichote

Sonic Distortion Circuit Diagram Only __ Designed by J.D. Sleep

Sound Blaster Microphone Preamplifier Dynamic microphones can be connected to SoundBlaster if a suitable microphone preamplifier is built which can amplify the signal levels from dynamic microphones so much that they give enough level for SoundBlaster.  This amplification can be quite easily done using simple single transistor microphone preamplifier circuit __ Designed by Tomi Engdahl

Sound Card Based Signal Generators Previously, E-DSP visited the possibility of using your sound card as a signal/function generator.  I was curious about the results, but did not have a Windows machine close by to test it.  After some searching, I found a Linux alternative and was able to test the limitations of my Sound Blaster Live!

Sound Card Interface for PC Test Instruments You can have a virtual electronics lab in your PC.  Just attatch this simple interface to your sound card.__ SiliconChip

Sound Card Interface with Tone Keyer This is an improved version of the audio interface commonly used to connect a computer soundcard to a transceiver's receive and transmit audio circuits.  This kind of interface is used by computer programs that send and receive SSTV, RTTY, CW, PSK31 and various other digital modes entirely in software.  Soundcard interfaces are not data controllers, TNCs, decoders

Sound Card with PCM2702 Make a sound card is no more a complex issue.  If you use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully functional USB sound card.  This sound card can be

Soundcard Joystick Port Problem Solver Typical PC soundcards (for example Sound Blaster family) has added MIDI interface to the joystick connector by using pin 12 for MIDI output and pin 15 for MIDI input.  This causes sometimes problems with some joysticks and adapters which work pefectly on standard joystick port.  The following conversion circuit enables standard joystick Y-cables __ Designed by Tomi Engdahl

SPDIF RCA to (Optical + RCA) Adapter I needed to connect one RCA digital SPDIF output to a TOSLINK optical input.  As many times, a simple device with that functionality was again much more expensive that what I believed reasonable.  I found some circuits on the net and I adapted those designs to my needs. __ Designed by EB4EQA

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