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Computer Interface Circuits

Computer Interface: 
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Last Updated: December 25, 2017 01:48 PM

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

Data acquisition system uses fault protection 04/15/04  EDN-Design Ideas ensitive systems, such as those in aircraft, must withstand fault conditions, thereby avoiding component and system damage, because a sensor failure could cause a catastrophic event to occur.  A channel protector, comprising two n- __ Circuit Design by Catherine Redmond, Analog Devices, Limerick, Ireland

Data Acquisition System with VB Build a data acquisition system with Visual Basic and the 89C51.   __ Designed by Wichit Sirichote

Data acquisition with PIC18F4550 This project is simple and small component count USB data acquisition or USB DAQ.  The main core of USB device is PIC18F4550.  The firmware for PIC modified from Microchip CDC library.  When connect this USB Data acquisition with PC then windows ask for driver after driver installed (only first time) you will have a new COMx if not connect the COMx not create by Windows.  

Data-acquisition system captures 16-bit voltage measurements using the USB 05/25/06  EDN-Design Ideas The USB has become the interface of choice for connecting to PCs.  Available on all relatively modernPCs, the USB offers a standard connector and can supply power to peripheralsat 5V and as much as 100 mA of current.  The circui __ Circuit Design by Terry Millward, Maxim Integrated Products Inc, Blonay, Switzerland

DB-15hd VGA Connector Make your own KVM or VGA Switch

DC Power Supply Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC.  The supply is suitable for microcontroller experimenting.   __ Designed by Wichit Sirichote

DC Voltage & Current Source A reference volatge and current source for testing data converter and analog amplifier.  A simple circuit built with TI LinCMOS opamp, TLC254C provides multiple outputs: +2.5V, 0 to +2.5V and 0 to 250uA.  The circuit is operated with 9V battery. __ Designed by Wichit Sirichote

DDS IC plus frequency-to-voltage converter make low-cost DAC 02/05/04  EDN-Design Ideas Precision DACs are essential in many consumer, industrial, and military applications, but high-resolution DACs can be costly.  Frequency-to-voltage converters have good nonlinearity specifications—typically, 0.002% for the AD650—and  __ Circuit Design by Noel McNamara, Analog Devices, Limerick, Ireland

Debugging a PC I Bus with a Mixed-Signal Oscilloscope 5988-7745EN Application Note__ Aligent

Decoder Safely Drives Data-Bus Buffer 07/18/96 EDN-Design Ideas Under control of the decoder chip, a 74LS245 buffer separates the onboard data bus from the ISA bus.   Figure 1 shows a common way of implementing an I/O decoder for the ISA (or similar) bus.  Under control of the decoder chip, a 74LS245 buffer separates the onboard data bus from the ISA bus.  If the DIR and G/ signals derive only from decoder inputs, they change state simultaneously at the beginning and end of an I/O cycle.  Such behavior can cause undefined operation of the buffer with possible contention on the local or ISA bus (particularly if you use a faster version of the 245). __ Circuit Design by Piotr Mazur, Wikom, Warsaw, Poland

Derive an efficient dual-rail power supply from USB 06/13/13  EDN-Design Ideas Wind the transformer yourself for the voltage you need.   __ Circuit Design by R O Ocaya

Design & build your own iPod docking station This one goes out to everyone that has an iPod or two laying about and an itchy soldering iron and thinks that the standard USB or Firewire dock just isn't quite good enough.  The tiny thirty pin dock connector on the bottom of later model iPods contains quite a few connections and we want to take advantage of all of them: audio, video, serial, USB and Firewire.   __ Designed by Will O'Brien

Design a Low Jitter Clock for High Speed Data Converters App Note/ 800 / Aug-05__ Maxim Integrated

Design a Visible Optical Link for RS-232C Communications 01/09/03 EDN-Design Ideas Embedded processor directly drives LCDThe design in Figure 1 is a visible optical link for those who need to see the transmitted data.  An isolation figure ofthan 5000V is a bonus.  Tests of the system used the COM input of a data-acquisition system, as well as a standard PC's COM port.  The MC1489 converts the RS-232C data to TTL signals __ Circuit Design by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India

Design an RTD Interface with a Spreadsheet 02/07/08  EDN-Design Ideas Using a spreadsheet and some simple math, you can design a linearizing interface to a non-linear RTD __ Circuit Design by Robert S Villanucci, Wentworth Institute of Technology, Boston

Design Considerations for RS-232 Interfaces DN27 Design Notes__ Linear Technology/Analog Devices

Design PCB Single-side PCB for Easy-Downloader V1.3 by Dr.  Homayoun Daneshgar M.  D.   __ Designed by Wichit Sirichote

Desktop Power Supply Useful for electronics hobbyists, this linear workbench power supply converts a high input voltage (12V) from the SMPS of a PC into low output voltage (1.25 to 9 volts).  An adjustable...__ Electronics Projects for You

Desktop Power Supply from a PC 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

Device to Monitor the power supply voltages of Commodore computers & warn if they are out of spec The circuit is divided into three sections for the different warning functions __ Designed by Kevin Koster

Device Will Never Let You Forget Your Password -- it's Your Heartbeat 13-Nov-14 -Design News:   Elizabeth MontalbanoBiometric identification for access to devices is nothing new, but a Canadian company has put a new spin on the technology by using people’s heartbeats to allow them to wirelessly access their devices -- including their smartphone, computer, car, or even their home.  Bionym , founded in 2011 as a __ Gadget Freak

Different Programs In the Chip using a PIC16c508 Scroll to find this circuit #3Up to 5 different programs can be burnt into a single '508A and the required program can be accessed by soldering a resistor between one of the outputs and the "input-only" lineGP3, as shown in fig: 4. 
During turn-on, a special program will put a HIGH on each output in turn and the output containing the resistor will determine the program.   __ Contact: Colin Mitchell

Differential-To-Single-Ended Converter 03/14/96 EDN-Design Ideas The circuit in Figure 1 addresses applications in which you need to convert a differential-current output to a single-ended voltage.  Several analog modules, such as the MC1495 multiplier and the LM1596 modulator/demodulator, provide differential-current outputs.  You can adjust R5 to adjust the voltage gain over the range of 5 to 201 to accommodate your application(added 07/08/09] __ Circuit Design by Hooman Hashemi, National Semiconductor Corp, Santa Clara, CA

Digital Audio/ Video Input Selector Need to connect more than one audio-video (AV) source to your colour television? Don’t worry, here’s an AV input expander for your TV.  It is inexpensive and easy to construct.  The working...__ Electronics Projects for You

Digital Audio/ Video Switch 8 channel switch.   __ Designed by Peter Jakab

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