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Computer Cable Designs
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Last Updated on: Monday, December 25, 2017 01:47 PM

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

Laptop Audio Amplifier This circuit uses a power amplifier IC LA 4440 and two 6 watt speakers to amplify the audio output of a laptop. __ Electronics Projects for You

Laptop Computer Serial Port Power Booster If you are looking at this page, you probably feel like I did when I tried to run a self-powered PIC programmer with my notebook computer.  Yes, the serial port was the ultra-low-power type and wouldn`t provide enough current to power the programmer.  The problem was clear and so was the solution.  I could have modified the programmer to get the power from somewhere else, but in the future I悲 crash with the same wall. __ Designed by EB4EQA

LCD 2 USB LCD2USB is a open source/open hardware project.  The goal of LCD2USB is to connect HD44780 based text LCD displays to various PCs via USB.  LCD2USB was meant to be cheap and to be made of easily available parts.  It is therefore based on the Atmel AVR Mega8 CPU and does not require any difficult to obtain parts like separate USB controllers and the like. __ Designed by Till Harbaum <Till @ Harbaum.org>

LED Light A simply and easy-to-make circuit, useful when working with the computer at night.  (6/08/2006) __ Designed by Jose Pino

LED Load The board supports driving two separate tri-color LEDs.  More can be setup inline if desired.  Currently the software only uses the second LED and its color represents the CPU load of the system in real-time.  Blue for idle and gradients light blue, green, yellow, orange, and finally red indicating heavy CPU utilization.  If the system fails to respond, the LED begins flashing RED to indicate a lack of communication from the software.  This lets you easily identify a crashed machine in a rack for example. __

Link Neatly Measures Temperature 10/26/00 EDN-Design Ideas Figure 1 shows a convenient and neat way to measure temperature using the USB of a PC.  An ADM1023 IC senses the temperature, and an Anchor Chips EZ-USB AN2131SCC provIdeas control.  The ADM1023 is a low-cost device with an accuracy of 1C and a resolution of 0.125C.  The IC is a two-channel device that can measure its own local temperature and the temperature of a remote location__ Circuit Design by Mary Burke, Analog Devices, Limerick, Ireland

Method Tests Cables 10/17/02 EDN-Design Ideas MOSFET serves as ultrafast plate driverEngineers have long known how to test a cable for continuity by simply connecting all conductors in series and checking with an ohmmeter.  This method is sometimes impractical, however, because it cannot check for short circuits.  The method shown in Figure 1 solves the short-circuit problem.  Connecting__ Circuit Design by Jim Keith, Bell-Mark Technologies, Dover, PA

MP-3 Stereo Transmitter with USB control from a PC This low cost MP-3 player was designed to be run from a PC via a USB interface.  The MP-3 audio from a PC sound card is transmitted to a home stereo via a synthesized FM Transmitter.  Also included is a 433 MHz wireless remote control to provide basic VCR type functionality to the whole design. __ Designed by Steve Hageman

Multi wire cable tester A multi wire cable tester with a separate LED for each wire.  Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC's.  Designed initially for my intercom, but can be used with alarm wiring, CAT 5 cables and more __ Designed by Andy Collison

Multiple Output DC/DC Converter Runs Off 2-Cell AA Batteries USB or AC Wall Adapter DN1006 Design Notes___ Linear Technology/Analog Devices

New ICs Simplify Battery Charging from the USB DN320 Design Notes __ Linear Technology/Analog Devices

Null Modem cable 9-pin Circuit only, no circuit description included. __ Designed by Tony van Roon  VA3AVR

Null Printer Adapter 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

Parallel port logic analyzer As I don't have an oscilloscope yet so I needed a cheap way to analyze some signals, I decided to build a simple logic analyzer to use with PC's parallel port.  I used the schematic from here as a base and made my own improvements to it so it would __

Parallel Port Microchip PIC Micro Controller Programmer PIC Programmer is an essential tool if you wish to learn or build projects with Microchip PIC Micro Processors.  This programmer is built using Free Windows Software called WinPicProg and other similar software from PICALLW or Oshosoft __

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

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

Printer Sharing Switch I had two computers, a Mac Mini and a generic Windows computer.  Both were on different networks, but in the same room, and I wanted to share a Lexmark USB laser printer between the two of them.  I ended up making this switch to share the printer between the two computers __ Designed by Dick Cappels

Programmer for Atmel AVR Controllers USBasp is a USB in-circuit programmer for Atmel AVR controllers.  It simply consists of an ATMega48 or an ATMega8 and a couple of passive components.  The programmer uses a firmware-only USB driver, no special USB controller is needed. __

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