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 doesn’t require additional AND...__ Electronics Projects for You
Eight-pin µC 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 µC (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 µC reads two analog inputs through AN0 and AN1 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 Design by F Ferrero, J Blanco, JC Campo, and M Valledor, University of Oviedo, Gijón, 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 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 Monat, Mesa, AZ
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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