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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:

PIC Diode Tester This is a simple use of the PIC 16F84 about a diode tester.   __ Designed by Manolis Xenias

PIC Micro to ISA Bus Interface Schematic Only

PIC Project #1 RS-232 to I2C Interface The I2C232 provides an RS232 interface to the I2C bus.  The interface uses ASCII commands for use with any terminal program.   The MicroChip PIC16C63 provides the intelligence and both the SCI and I2C peripherials to power the I2C232 adapter. __ Contact: ronrus s@ emicros.com

PIC to PC USB 2.0 interface with FT245BM Here's an example of how to interface a PIC18F452 to a PC via the USB port.  The windows-pc (98, Me, 2000, XP, 2003) runs a program (C# application, Microsoft Visual Studio .NET 2003) to communicate with the USB interface, which transfers data to and from the PIC18F452. __ Designed by Michel Bavin

PIC USB Development Board Since I wanted to do some USB development work with the PIC18F4550 and PIC18F2550 board (for projects like my C64 VICE front-end and Atari joystick adaptor) I needed a USB reference board to develop the software.  Initially I ported the Microchip

PIC USB Interface with FT245 This is a simple design that interfaces a PIC 16F877 microcontroller to the USB bus using the FTDI FT245 USB FIFO device. 
It has been designed using a simple single sided PCB with only.  (__ Designed by Ian Stedman

PIC16f84 Debugging Terminal Build a simple 9600 BAUD 8n1 LCD terminal for debugging and testing the projects having RS232C output __ Designed by M Asim Khan  asimkhan @ sat.net.pk

PIC16f84 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

PIC16F84 Serial I/O Expander with Picbasic This article shows how to use the PIC16F84 microcontroller with PicBasic to design a quick & effective, serially controlled, I/O-Expander.  Using PicBasic makes developing handysingle-chip devices like this extremely simple.   __ Designed by © Reynolds Electronics

PIC18f2550 Project Board The new PIC18F2550 Project Board was designed as the development platform for student projects.   __ Designed by Wichit Sirichote

Pic-Plot GPIB to RS-232 converter Get rid of dry plotter pens or unclear camera snapshots of test instruments when reporting your lab test session.  This adaptor will capture plots or prints of your GPIB instrument to your PC through the serial port.   __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

Pic-Plot2 GPIB to USB converter Pic-plot goes to USB  Without any additional adapter, the new Pic-plot2 directly communicates with your PC or laptop through the USB port.  Gives faster downloads from your GPIB instrument and it is self-powered from the host PC: no need of DC adaptor.   __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

Pin Diagrams Hardware schematic that shows pin diagram for common memory & interface chips __ Designed by Wichit Sirichote

Platinum-RTD-Based Provides High Performance with Few Components 4-Sep-08 EDN-Design Ideas A low-cost and low component count circuit provIdeas an accurate output voltage from a platinum RTD __ Circuit Design by Jordan Dimitrov, Toronto, ON, Canada

Playing a MAC through a Standard Telephone Line how to get sound from computer to Telephone line

PLD code reveals PC-Board revisions 10/17/02 EDN-Design Ideas The PLD(programmable-logic-device] code in Listing 1 implements a pc-board-level revision-detection system that detects whether PLD pins are shorted together on a pc board.  It is often advantageous to field a single PLD programming file that works for several generations of physical hardware.  The PLD needs to understand what the board revision is, so that it can enable or disable functions, pi __ Circuit Design by Clive Bolton, Bolton Engineering Inc, Melrose, MA

PLD Implements Fast Four-Phase Clock Generator 10/27/94  EDN-Design Ideas The circuit in Fig 1a can clock pipelined logic in PLDs by an external agent at one-half the usual frequency.  You can use this circuit when designing pipelined ALUs and switched-capacitor circuits.  I used this circuit to drive a 40M-sample/sec CMOS flash __ Circuit Design by Said Jackson, Hamburg, Germany

PLD Solves RS-232C Compatibility Problem 01/19/95 EDN-Design Ideas RS-232C communication has many nasty, low-level problems.  For example, converting one form of RS-232C bit stream to another is frustrating without a general-purpose UART.
The circuit in Fig 1 strips the parity bit out of an RS-232C bit stream.  The input is a 9600-baud, 8-data bit, odd-parity, and one-stop-bit (9600,8,O,1) stream.  The output is a no- parity (9600,8,N,1) stream. __ Circuit Design by Phil Hamory, NASA/Dryden Flight Research Center, Edwards, CA

PLDs Eliminate ISA PC-Board's Jumper 06/23/94 EDN-Design Ideas Having software ask users about base addresses for newly installed ISA-bus (industry-standard-architecture, ie, the IBM PC bus) pc board is far more elegant than requiring the users to decipher HEX address and set pc-board jumpers.  GAL20R8 PLDs, programmed according to Listings 1 and 2, along with an 8-bit comparator allow software to set pc boards' base addresses.   The comparator has one input tied to the ISA address bus and the other to one of the PLDs.  This PLD contains a register initialized to some base address on power-on.  The second PLD contains a "table" (actually, a Boolean formulation) of available base addresses.    __ Circuit Design   Vladimir Bochev, Bulgarian Academy of Sciences, Sofia, Bulgaria

PLDs Implement Delay Line 03/31/94 EDN-Design Ideas PLDs such as the Altera MAX5000 family can easily generate asynchronous delays and pulses with an edge-to-edge timing resolution of 8 nsec.  Newer families can go even faster.  The development-system simulator allows you to quickly and accurately design and predict the timing of the required delay patterns.  However, you must be careful  __ Circuit Design by Trevor J Preston, Astromed, Cambridge, England 03/31/94

PLDs Substitute for Obsolete Latched 06/09/94 EDN-Design Ideas The 22V10 series of PLDs in 24DIP300 or 28PLCC packages can substitute both physically and functionally for the now-discontinued 74ALS844 and 74ALS880 latches.  Beware, however, that some early PLCC versions of the 22V10 do not have compatible pinouts.  Listings 1 and 2 contain the PLDASM source code for 22V10s that emulate the 74AS/ALS844 and 74AS/ALS880, respectively __ Circuit Design by Michael A Wyatt , SSAVD Honeywell Inc, Clearwater, FL

PLL forms Simple Circuit MSK Demodulator 12/17/98 EDN-Design Ideas In minimum-shift-keying(MSK) signaling, two frequencies that differ by the bit rate represent a one bit and a zero bit.  Normally, the frequency shift occurs at the peak of a cycle, so that neither the amplitude nor the slope of the waveform shows a discontinuity.  We needed to transmit 300-baud ASCII text using ultrasonic transducers.  These devices have a very narrow bandwidth around their 25-kHz resonant frequency, making MSK the obvious choice for modulation.  A zero Page includes several designs.  Scroll to find this one __ Circuit Design by JTom Napier, North Wales, PA

PLL IC Forms Simple Circuit Digital Phase Shifter 01/04/96 EDN-Design Ideas A phase shifter is a vital block in some signal-processing and clock-distribution applications.  Another important application is in benchmarking digital phase detectors.  The circuit in Figure 1, an especially appropriate one for evaluating phase detectors, uses only two industry-standard ICs(CD4046 and LM311].  It relies on digital PLL techniques __ Circuit Design by Haldun Karaca, DE University Bornova, Izmir, Turkey

PLL synchronizes power-supply IC 07/16/98 EDN-Design Ideas It is often desirable to synchronize a switching power supply to a system clock or to a second supply.  If the power-supply controller has no synchronization pin, you can add a low-value resistor in series with the oscillator capacitor, thereby developing a synchronizationFile has several circuits, please scroll to find this one __ Circuit Design by Kurk Mathews, Linear Technology Corp, Milpitas, CA

Ponyprog for ATMEL'S AVR The ATMEL AVR programmer works with the Windows program "Ponyprog" which works under 95, 98, XP, and can be found at [url]http://www.  lancos.  com/prog.  html[/url] On board the AVRs that can be programmed are those in the schematic.  For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector (CON10) which allows expanding the programmer's hardware.  See Ponyprog's site for other's ICs Ponyprog circuits.  The JUMP1 jumper is there to connect the crystal's circuitry to the 8- pin AVRs or to disconnect it.  Some AVRs have internal

Ponyprog for AVR & PIC16F84 All resistors are 1/4W.  The circuit is powered by 915V DC or AC.  When In Circuit Programming (ISP) connectors are used, is possible the programmer to be powered from target’s power source.  Diodes D2 and D6 protect the regulator LM7805, when target’s power is used.   __ Designed by Kyriakos Kontakos

Power Conditioning for Notebook & Palmtop Systems AN51 Notebook and palmtop systems need a number of voltages developed from a battery.  Competitive solutions require small size, high efficiency and light weight.  This publication includes circuits for high efficiency 5V and 3.3 V switching and linear regulators, back light display drivers and battery chargers__ Linear Technology/Analog Devices

Power over Ethernet Isolated Power Supply Delivers 11.5W at 90% Efficiency DN338 Design Notes__ Linear Technology/Analog Devices

Power PC 's on chip Debug features alter embedded Development 07/16/98 EDN-Design Feature  The PowerPC is one of the most talked about microprocessor families in the embedded-system market.  The PowerPC's RISC architecture offers massive processing power at attractive prices.  The latest member of the family—the 604e—offers a SPECINT92 of 225 at 166 MHz.  More important, the companies behind the PowerPC—IBM(Armonk, NY] and Motorola(Phoenix]—appear to know what it takes to firmly position the PowerPC in the embedded market, and they have the resources to succeedFile has several circuits, please scroll to find this one[ __ Circuit Design by Jim Challenger, Software Development Systems

Power Reboot Simple circuit for booting the PC base linux server.   __ Designed by Wichit Sirichote

Power Supplies for Subscriber Line Interfaces DN130 Design Notes __ Linear Technology/Analog Devices

Power Supply Converted from a PC link This ATX PS board has leads for +5 (RED) , -5 (WHITE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN).  Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes.  The fan has also been unplugged for better viewing.  Since this PS was converted for use in the logic and robotics labs, the selected voltages  __ Designed by Andy Batts

Power Supply Hub with Battery Charger, Quad-USB & Variable Outputs This article presents a simple, universal low-cost power supply hub with quad-USB and variable voltage outputs, plus a battery charger.  There are electronic equipment like battery chargers, electronic lamps and MP3...__ Electronics Projects for You

Power Supply-Basic UPS This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply.  In the event of electrical supply line failure the battery takes over, with __ Designed by Andy Collinson

Power USB Devices From a Vehicle 11/18/10 EDN-Design Ideas Supply power to two USB devices from the cigarette lighter or other power source.  [Design Ideas by Fons Janssen, Maxim Integrated Products Inc, Bilthoven, the Netherlands __ Circuit Design by Fons Janssen, Maxim Integrated Products Inc, Bilthoven, the Netherlands

Powered AA NiMH
& NiCd Battery Charger
The charger in this project is designed to charge two AA NiMH
or NiCd cells of any capacity (as long as they are the same) at about 470mA.  It will charge 700mAh NiCds in about 1.5 hours, 1500mAh NiMH
s.   __ Designed by Stefan Vorketter

PowerPC's On Chip Debug Features Alter Embedded Development 11/07/96 EDN-Design Feature   Although best known for high performance, the PowerPC family adds a new dimension to embedded-system development.  Unlike most processor families for desktop applications, the PowerPC family includes features designed around embedded-system developers' needs. __ Circuit Design by Jim Challenger, Software Development Systems

Power-supply operates from USB port 09/23/10 EDN-Design Ideas Get 1.25V to 3.75V from an adjustable regulator.    __ Circuit Design by Stefano Palazzolo, Senago, Italy

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