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Computer Interface Circuits

Computer Interface: 
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Last Updated: November 21, 2017 05:44 AM


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

Adding external memory to Atmega128. Part 1. Schematic Atmel AVR microcontroller Atmega128 is equipped with internal 4Kbytes of SRAM memory.  Is it enough? Well it depends on what project itís gonna hold.  If your project must deal with loads of data or run larger RTOS code you will definitely run

Adding external memory to Atmega128. Part 2. Software To test if external memory board works we are going to write a simple routine that tests if microcontroller can allocate memory heaps, write to and read from then.  First of all we have to set up AVRStudio project.  If your are going to use automated

Adding Second Joystick to PC Joystick Interface PC joystick interface was designed to support two joysticks, but unfortunately it has only one connector.  The second joystick can be added when you get a special Y-cable, which has connectors for two joysticks.  Those cables can be bought ready-made.   __ Designed by Tomi Engdahl

Addressable I≤C Bus Buffer Provides Capacitance Buffering Live Insertion & Nested Addressing in 2-Wire Bus Systems DN329 Design Notes__ Linear Technology/Analog Devices

ADMS programming Cable for the Yaesu FT50, VX1 & VX5 After some time playing with the FT-50RD   (brick!!) VHF/UHF handheld transceiver from Yaesu, I realized how useful would be programming it with the computer.  I bought the ADMS-1E software, which came with a nice cable featuring the expected 4 conductor jack that drives everyone crazy __ Designed by Roberto Barrios EB4EQA

ADSL Modems that Use the LT1886 as a Line Driver Yield Long Reach & Fast Data Rates DN240 Design Notes__ Linear Technology/Analog Devices

Advanced Topology USB Battery Charger Optimizes Power Utilization for Faster Charging Design Notes 336: The LTC4055 seamlessly manages power flow between an AC adapter, USB cable and Li-Ion battery, all while maintaining USB power specification compliance.  __ Linear Technology/Analog Devices

AeroComm CL4490 Experiments Wireless data networking experiments using AeroComm modules and data modems.  __ Amateur Radio circuits from Green Bay Professional Packet Radio

AFSK 1200 Modem Based on PIC16c620 Schematic Only

AIU: Analog Interface Unit If you need to add simple data acquisition capabilities to your PC, n look no furr than Analog Interface Unit.  The Analog Interface Unit   (AIU) is a simple circuit that connects to a PC parallel port, and allows you to sample and output 8-bit analog signals under software control __ Designed by David L. Jones

Aladin interface Whoever thinks about reproducing an interface for the Aladin, should first of all be aware of the fact that there are two different versions of the interface.  The first version, easier to assemble, enables the user to transfer dive data from the Aladin to the personal computer.  The other version, a more complex construction than the first one, enables the user both to transfer data from the Aladin to the PC and to configure some Aladin features via the PC.   __ Designed by Matthias

Aladin interface Whoever thinks about reproducing an interface for the Aladin, should first of all be aware of the fact that there are two different versions of the interface.  The first version, easier to assemble, enables the user to transfer dive data from the Aladin to the personal computer.  The other version, a more complex construction than the first one, enables the user both to transfer data from the Aladin to the PC and to configure some Aladin features via the PC.   __ Designed by Matthias

All-In-One USB Power Management IC Solution DN1008 Design Notes__ Linear Technology/Analog Devices

AM Transmitter The circuit is in two halfs, an audio amplifier and an RF oscillator.  The oscillator is built around Q1 and associated components.  The tank circuit L1 and VC1 is tunable from about 500kHz to 1600KHz.   __ Designed by Andy Collison

Amplifier & Current Source Emulate Instrumentation Amplifier 11/13/03  EDN-Design Ideas The classic three- or two-op-amp instrumentation-amplifier circuits are standard ways to amplify a small-amplitude differential signal contaminated with high common-mode noise.  In some applications, the signal source is floating wi __ Circuit Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria

An 8-Channel PC Relay Board Control devices via your PC parallel port with this eight-channel relay board.__ SiliconChip

An Experiment to Build a PCI Board This is the simplest bus cycle.  Target devices detect the start of the bus cycle by the FRAME# is asserted at the second clock.  At a bus cycle is initiated, the bus comand and the address is taken in to each target device attached to __ Designed by Radio LocMan

An Improved Infrared Receiver with status LED (Billy's Plug) This is the latest version of the Improved Infrared Receiver with Status LED which can control any desktop PC with an ordinary remote control.  The project comes along with a small PCB in order to save space.  It connects to the serial port as stated in the schematic and uses the freeware Girder   (www.  girder.  nl) software together __ Contact: IQ Technologies

An OBDII Interface for a Laptop Computer If you have a laptop PC you can build your own OBDII interface so you can access all the information available to a dedicated hand-held scan tool but at a much lower cost.  Not only can you access all the fault codes in your car's ECU but you can then store them in your laptop for future reference.__ SiliconChip

Analog MIDI Synthesizer Schematic only, no circuit description __ Designed by John Simonton

Analog multiplexer uses flying capacitors 01/22/04  EDN-Design Ideas This design idea     describes a way to increase the number of analog inputs to your microcontroller for cases in which adding an analog-multiplexer chip or upgrading to a microcontroller withinputs might be impractical.  If the microcon __ Circuit Design by Dick Cappels, Mesa, AZ

Analog switch expands I2C interface 11/22/01 EDN-Design Ideas Perhaps the most effective way to gain board space and increase component density is to minimize wiring on the board.  A widely used architecture that allows such miniaturization is the I2C bus.  Comprising only a bidirectional data line, SDA, and a clock line, SCL, this bus requires no chip selects or other additional connections __ Circuit Design by Luca Vassalli, Maxim Integrated Products, Sunnyvale, CA

Analog-to-Digital Conversion Notes This chapter shows how to connect an analogue signal to a PIC. 
An analogue signal is similar to a sine wave and is generally less than 5v   (5,000mV) in amplitude.  Low-level signals are generally expressed in mV, to make them instantly recognisable and easy to talk about.   __ Designed by Colin Mitchell

Analog-To-Digital Converter Normally analogue-to-digital con-verter   (ADC) needs interfacing through a microprocessor to convert analogue data into digital format.  This requires hardware and necessary software, resulting in increased complexity and hence total cost.  The circuit of A-to-D converter shown here is configured around ADC 0808, avoiding use of a microprocessor.  

Analogue to Digital Converter for PC Serial Port This circuit is a simple adapter for PC parallel port to think that there is a printer connected to computer.  This adapter is useful for testing printing speed with different software and as a part of your own designs. 
You can use this circuit to connect your simple circuits to the parallel port __ Designed by Tomi Engdahl

Analyze Analog Signal Data with a PC-Hosted Logic Analyzer & Excel Application Note__ Aligent

Animated Weather LED Display 21-Mar-14 -Design News:   This project displays the weather in the form of an animation on an LED matrix (32x32 resolution or 1024 LEDs).  The Raspberry Pi is periodically pulling weather conditions from the Internet and then sending a corresponding animated gif weather animation to the IOIO board and LED display.  IOIO is an __ Gadget Freak-Case #252

Apple II/II+/IIe IDE Drive Interface The following document describes the current status of an IDE Drive Interface for the Apple II/II+/IIe.  The project is not complete.  The interface shown here allows the IDE Drive registers to be accessed from the Apple II.  The outstanding item is the completion of the required EPROM so ProDOS recognizes the card as a block device.  Work on this EPROM is currently in progress __ Designed by Andrew Quinn

Arduino WebRadio player An inexpensive WebRadio station player that plays audio streams up-to 64-kbps.   Few components   (as always !) with great sound quality! __ Designed by © Vassilis Serasidis

Assembly Language Programming: the 8051 Microprocessor Handout for my 3rd Year students.   __ Designed by Wichit Sirichote

Assorted Computer Interfaces several circuits here, spend some time and view each of them __ Designed by YO5OFH, Csaba Gajdos

AT Keyboard Interface V1.04 Sometimes you only need a simple and cheap RS232 terminal to get sufficient control over a PC or a RS232 device.  There is no need, no space or even no power to place a monitor, a computer case and a keyboard.  Maybe there exists also __ Designed by Radio LocMan

AT PC Power Supply 1 Schematic only, no text included

AT PC Power Supply 2 Schematic only, no text included

AT PC Power Supply 3 Schematic only, no text included

AT PC Power Supply 4 Schematic only, no text included

AT PC Power Supply 5 Schematic only, no text included __ Designed by Zsolt Sebestyen  pro2sebiatinterware.hu

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