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Digital  / Logic Circuits 
Digital Circuits:   #'s - C       D - G       H - M       N - R       S - T       U - Z

Last Updated on: Thursday, November 30, 2017 04:23 PM

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

Easy Downloader -  Build your own a personal writer forprogramming HEX code into Flash based microcontroller AT89C2051  (2k) andAT89C4051  (4k) .  Simple hardware and Easy use software in DOS and Windowversion.  Single-side and double side PCB files included.  sourcecode with sdcc version! __ Designed by Wichit Sirichote

Easy-To-Build Bench Power Supply -  It runs from a 9VAC plugback and offers six fixed dual-polarity DC voltages from 3V to 15V.__ SiliconChip

Easy-To-Use Flash-Memory Modules Emulate Disk Drive -  09/01/94 EDN-Design Ideas Because more and more flash-memory modules look just like familiar disk drives to your system, designing in fast and rugged mass storage has never been simpler.  Companies promoting the use of flash memory in mass-storage applications seem to have made an interesting discovery: To convince customers to use flash instead of a disk drive, make the flash look like a disk drive.  Increasingly, new flash storage products incorporate a hardware controller that emulates a disk drive's system interface.    __ Circuit Design by Gary Legg, Executive Editor 09/01/94

EEPROM Project -  Many projects require the use of an external EEPROM to store data.  This project will give you all the details on how to interface the Basic Stamp II with a 64K SPI Bus Serial EEPROM.  Great for those datalogging applications __ Designed by Shaun Wilson

Effects of Digital Crosstalk in Data Converters -  App Note/ 1761 / May-06__ Maxim Integrated

Effects of ParasitICs In Simulations 12/11/00  -  App Note  Doc #930__ California Eastern Laboratories

Efficient Processor Power System Needs No Heat Sink -  DN135 Design Notes__ Linear Technology/Analog Devices

Egyption Talking Frog Box -  This device 'listens' to a conversations and then interjects words and phrases at inappropriate times.   __ Designed by Luhan Monat-Mesa Arizona

Eight-Digit Code Lock for Appliance Switching -  This code lock is useful for appliances requiring exclusive or authorised use by those who know the preset code.  If desired, the code can be changed.The circuit doesnt require additional AND...__ Electronics Projects for You

Eight-pin C forms one-chip programmable VCO -  09/24/98 EDN-Design Ideas NOTE :  multiple circuits, scoll to this one.  The circuit in Figure 1 uses a Microchip 8-pin C   (PIC12C671]as a voltage-controlled oscillator   (VCO].  Because  PIC12C671 has an internal 4-MHz oscillator, four-channel 8-bit A/D converters, and built-in power-reset circuitry, you need no external components to configure  VCO.  The C reads two analog inputs through AN0 and AN1 __ Circuit Design by Yongping Xia, Teldata Inc, Los Angeles, CA

El-Cheapo Musicians' Lead Tester -  Checking leads is a snap with this handy tester.__ SiliconChip

Electric cockroach zapper -  Using a PIC for this device provides a lot of useful functionality.  The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery.  The longer the current is on, the higher the voltage.  Once the inductor reaches saturation, however, you are just waisting power.   __ Designed by Luhan Monat-Mesa Arizona

Electric Shutter Release for Cameras -  Commercial remote shutter releases are usually expensive.  Here's one you can build for just a few dollars.__ SiliconChip

Electrolytic Capacitor Reformer & Tester -  Got a bunch of old electrolytic capacitors you'd like to use but don't know if they are any good? Or do you need to re-form the electrolytics in an old valve amplifier or vintage radio set? This Electrolytic Capacitor Reformer and Tester will do the job for you, at any of 11 different standard voltages from 10V to 630V.__ SiliconChip

Electrolytic Capacitor Reformer & Tester, Pt.2 -  Last month we introduced our new electrolytic capacitor reformer and testerideal for anyone working with vintage radios, valve equipment or indeed the hobbyist who has gathered a collection of electrolytics over the years.  Now you can not only test them, you can  (usually!) breathe new life into them if they've suffered from the ravages of time!__ SiliconChip

Electronic Lock -  The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad.  The first 4 outputs from the CD4017 decade counter  (pins 3, 2, 4, 7) are gated __ Designed by Bill Bowden

Electronic Locker -  This circuit is an Electronic Locker.  It is controlled by a switches combination  (by a code) .  There is a switch matrix on the door of the locker.  This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals

Electronically Generate Rotating Magnetic Fields -  18-Feb-10 EDN-Design Ideas Generate magnetic fields with a microcontroller instead of mechanical parts __ Circuit Design by F Ferrero, J Blanco, JC Campo, and M Valledor, University of Oviedo, Gijn, Spain

Embedded Memory Enhances Programmable Logic for Complex Designs -  11/07/96 EDN-Design Feature The growing densities of PLDs are making the chips suitable for increasingly complex designs.  Those designs require high-performance scratchpad RAM for temporary storage of data that passes through the logic circuitry that th __ Circuit Design by Rick Nelson, Contributing EDFtor

Emergency Power -  This unit was constructed in a plastic 4-outlet juction box  ($5 from Home Depot) .  The front panel is cut from 60-thou Lexan, and a scrapped Pep-Boys battery charger provided the transformer.  The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents.   __ Designed by Luhan MonatMesa Arizona

Engine/Race Computer Board -  The objective of this project is to design a high speed digital engine tachometer.  This requires the design and development of a hardware and software solution to monitor the status of an engine in real time.  In addition, information relating to the overall health and systems of the vehicle can be displayed.   __ Designed by Stephen Manley-smanley @ nyx.net

Enhanced 4 Digit Alarm KeypA - D -  This is an enhanced 4 digit keypad which may be used with the Modular Alarm System __ Designed by Ron J.

Enhanced Sports Scoreboard -  This upgraded version of the Professional Sports Scoreboard now includes 2-digit fouls displays for the home and away teams.__ SiliconChip

EPROM adapter for ATMEL 89 Programmer -  The EEprom programmer software supports the following devices.28C16 28C256 28C17 29C256 28C64 __ Designed by Kyriakos Kontakos

EPROM Programmer Mk2 -  This design was never completely finished, so consider it to be in the very early experimental stage.  I don't sell kits, programmed PLD's, or provide support for this project, and I will never be published.  But if you want to take a bash at making it yourself, be my guest, it may or may not work, I guarantee nothing.  Try it at your own risk.  PLEASE don't contact me about this __ Designed by David L. Jones

ESR Meter Mk.2 -  Forget about capcitance meters; an ESR meter is the way to go when it comes to identifying faulty electros.__ SiliconChip

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Digital or Logic Circuits:  #'s - C       D - G       H - M       N - R       S - T       U - Z

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