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Easy Debugging Terminal - Build a simple 9600 BAUD 8n1 LCD terminal for debugging
and testing the projects having RS232C output....(added 7/03) |
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E-B-C Transistor Pin Identifier - Tests transistors and diodes for polarity Simple
circuitry 9V Battery operation (added 02/05) |
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E-H 201C Electrometer schematic - (added 07/07/07) |
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E-H 215 RL Electrometer schematic - (added 07/07/07) |
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EICO 1050 Battery Eliminator schematic - (added 07/07/07) |
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EICO 147a signal tracer manual w/schematic - (circuit added 07/07/07) |
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EICO 232-239 VTVM manual w/schematic - (circuit added 07/07/07) |
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EICO 250 AF VTVM schematic - (added 07/07/07) |
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EICO 315 RF/AF signal generator schematic - (added 07/07/07) |
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EICO 320-322 RF signal generator manual w/schematic - (circuit added 07/07/07) |
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EICO 324 RF signal generator manual w/schematic - (circuit added 07/07/07) |
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EICO 377 AF sine/square wave generator manual w/schematic - (circuit added
07/07/07) |
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EICO 379 AF sine/square wave generator manual w/schematic - (circuit added
07/07/07) |
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EICO 488 Electronic Switch schematic - (added 07/07/07) |
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EICO 677 tube tester information, manual w/schematic - (circuit added 07/07/07) |
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EICO 680 transistor tester manual w/schematic - (added 07/07/07) |
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EICO 710 grid-dip meter schematic - (circuit added 07/07/07) |
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EICO 950B impedance bridge manual w/schematic - (circuit added 07/07/07) |
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Elecraft XG2 receiver test oscillator - (schematic / circuit added 05/07) |
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Electric field & leakage detector - (diagram added 05/07) |
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Electrical Current Indicator - I designed this circuit as a simple current
indicator for any load ranging from 40 watts to 250 watts. The circuit turns on
a small LED, whenever it detects current flowing to a remote load. ….(designed by
David A. Johnson) |
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Electricity Metering - Similar considerations can be made for the automatic meter
reading where one possible solution consists in using ST7538, ST's Power Line
Modem.…(app note added 6/07) |
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Electrolytic capacitor tester - Firstly, we will describe the "add-on" version for
the 5x7 Display as this is the cheapest version and, quite frankly, it only deserves a
few dollars as a piece of test equipment. It's "all the rage" to have an Electrolytic
Tester for servicing equipment and yet I have serviced over 36,000 appliances without
one. Possibly it took me a long time to realise electrolytics have the capability of
drying out because old-style electros were inherently.....(diagram added 05/07) |
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Electromagnetic Emissions Test Report on Solid State Energy Meter - Electro Analog
Devices Application Notes (app note added 6/06) This report describes
electromagnetic immunity testing performed on September 9, 1999 through September 10,
1999 on the Solid State Energy Meter. Testing was performed pursuant to IEC 1036:1996,
a standard for alternating static watt-hour meters for active energy. |
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Electromagnetic Emissions Test Report on the AD7755 - AD7755 Analog Devices
Application Notes (app note added 6/06) This document describes
electromagnetic emissions testing performed on the Energy Meter (AD7755) on
September 8, 1999, pursuant to EN55022 requirements. It may be used to demonstrate
compliance with the European Union emissions requirements pursuant to the EMC
directive |
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Electromagnetic field detector (mitedu) - This circuit is sensitive to low
frequency electromagnetic radiation and will detect for example hidden wiring or the
field that encompasses a transformer. Pickup is by a radial type inductor, used as a
probe which responds well to low frequency changing magnetic and electric fields.
Ordinary headphones are used to for detection. The field that surrounds a transformer
is heard as a50 or 60Hz buzz. (added 5/02) |
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Electromagnetic field detector (tomi.geo) - This lovely circuit is a real gem!
Easy to assemble and more sensitive than many commercial devices available. It's based
around an LF351 low-noise operational amplifier and a 1mF choke acting as the sensor.
Unlike most other simple EMF detectors, this one has a meter output for accurate
reading, but alternatively, you can also....(added 10/05) |
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Electromagnetic Field Detector (zen22142) - This circuit is sensitive to low
frequency electromagnetic radiation and will detect for example hidden wiring or the
field that encompasses a transformer. Pickup is by a radial type inductor, used as a
probe which responds well to low frequency changing magnetic and electric fields.
Ordinary headphones are used to for detection. The field that surrounds a transformer
is heard as a50 or 60Hz buzz. (added 6/06) |
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Electromagnetic Field Probe with Meter Output - This tester is designed to locate
stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up
to frequencies of around 100kHz. Note, however that this circuit is NOT a metal
detector, but will detect metal wiring if it conducting ac current. Frequency
response....(circuit added 05/07) |
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Electromechanical damping stabilizes analog meter readings - 09/29/05 EDN-Design
Ideas: Electronics damps meter-needle swings.....(design idea added 9/08) |
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Electronic distance meter Based on Motorola 68HC908QY4 - (circuit / schematic
design added 6/06) |
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Electronic siren - An electronic siren made from discrete components.
(schematic added 03/04/05) |
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Eliminate thermoelectric EMF in Low ohm measurements - 06/13/02 EDN-Design Ideas:
When two different-metal conductors connect together in a loop and one of the
junctions is at a higher temperature than the other, an electrical current flows
through the loop. The magnitude of this current depends on the type of metals involved
and the temperature differential of the junctions. When you open such a loop, a
thermoelectric voltage.....(design idea added 1/05) |
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EMF Field Probe - This tester is designed to locate stray electromagnetic (EM)
fields. It will easily detect both audio and RF signals up to frequencies of around
100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal
wiring if it conducting ac current. Frequency response ....(circuit added 05/07) |
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Emulator Speeds Testing - 09/25/03 EDN-Design Ideas: Designing and testing
embedded hardware can be frustrating if you have to rely on somebody else's
perhaps-unready firmware to test your hardware. Often, hardware is ready for testing
before debugging and system firm-ware are available from software developers.
Microprocessor emulators are solutions but.....(design idea added 1/05) |
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Envelope Tracker Quells Jitter - 07/07/94 EDN-Design Ideas: Fig 1's envelope
tracking circuit solves the problem of receiving ac-coupled NRZ data over a coaxial
data link. Because the spectral content of the NRZ data approaches dc (even with
alternate frame inversion), the signal tends to integrate in any ac-coupled stage
preceding the zero-crossing detector,.....(design idea added 6/06) |
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Environmental Compensation on the AD7145 - AN-829 Analog Devices Application Notes
(app note added 6/06) |
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E-Power Meter - Intersil Application Block Diagram (app note added 6/06) |
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ERA-SM Test Board: Instructions for Use - Application Note MiniCircuits.com
(app note added 08/08/08) |
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ESD Gun Tests IC - 09/12/96 EDN-Design Ideas: You can use the simple ESD-test
gun in Figure 1 to test the effects of ESD through sensitive ICs. A piezo-electric
type kitchen gas lighter (the so-called ESD gun)is an excellent fast-static-charge
generator. This gun can cause ESD through air and also through conducting and
semiconducting materials.....(design idea added 2/06) |
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ESD Sensitivity Testing of Mini-Circuits ERA-4XSM - AN-60-028 Application
Note MiniCircuits.com (app note added 08/08/08) |
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ESD Sensitivity Testing of Mini-Circuits ERA-5XSM - AN-60-029 Application
Note MiniCircuits.com (app note added 08/08/08) |
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ESR & Low Ohms Meter (Jan '96) - I (Bob Barker) originally designed this
instrument for my own use, to help identify partly-open-circuit electrolytic
capacitors in-circuit, which cause so many faults in switching power supplies,
camcorders, TVs, monitors, etc. If you already have one, take a look at the ESR meter
hints page, and if you're having problems with a meter you just built, check out the
ESR meter problems page. (circuit added 02/06) |
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Ethernet 10Base T Simulator Jig yields Zero Emissions - 10/22/98 EDN-Design Ideas:
(design idea added 3/03) |
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Ethernet Weather Station - Using an add-on card to the already existing avr
ethernet board we build a weather station. That is: A weather station with a build-in
webserver. My original plan was to have sensors for temperature, air pressure and
wind. I started a prototype and it worked very well except for the wind measurement
part. I plan to improve the wind measurement hardware and add it at a later point in
time. ….(electronic schematic added 11/08) |
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Exclusive 2.5 GHz Frequency Counter - A frequency counter is one of the most
important measuring tool we need as homebrew's of RF electronic. This frequency
counter has very high performance and still is very easy to build and to use. Anyone
can build it and have a professional frequency measuring tool. The counter is based
around a LCD display with 2 lines and 16 chars. I have used a HD44780 based display
which is very common. A PIC16F870 circuit controls all counting and display functions.
A prescaler is added to make it possible to measure up to 2.5GHz with high
sensitivity. The Display Module Size (W x H x T): 80mm X 36mm. The controller PCB has
the same size. This makes the unit very small and slim. ….(circuit design added 11/08) |
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Exclusive 2.5 GHz Frequency Counter with Blue 2x16 LCD display - This project
explain a very powerful frequency counter which has many useful software functions.
The software can add or subtract 3 different IF frequencies (±455 kHz ,±10.7 MHz and
±21.4 MHz). You have also two level of resolutions, 1kHz and 100Hz.....(schematic
added 04/05/06) |
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Expanded Scale Battery Volt Meter - This circuit is used to measure the voltage on
a 12V (nominal) lead acid rechargeable battery system. It was specifically designed
for use in solar powered systems, but is general enough that it can be used for
automotive or other 12V systems. Lead acid batteries normally spend their working
lifetime in the voltage range of 11-15 Volts. This meter circuit was designed
to....(added 10/05) |
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Expanded scale indicator revisited - 08/08/02 EDN-Design Ideas: The
visualization aid that a previous Design Idea describes allows only the expansion of
the upper end of the scale (Reference 1). But what can you do if, according to your
project requirements, you need to expa.....(design idea added 1/05) |
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Expanded Scale Voltmeter uses Just Two Parts - 01/20/94 EDN-Design Ideas:
The expanded voltmeter doesn't require trimpots to obtain usable accuracy or require
the tedious selection of Zener diodes. This circuit consists of only two parts and a5V
meter. The circuit is completely linear and requires no calibration except the rare
mechanical zeroing of the meter. By using.....(design idea added 6/02) |
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Exploring the Architectures of Network Analyzers - Aligent Application Note
(app note added 04/05/06) |
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External Tracking Generator - 100kHz...1000MHz - (electronic circuit added 6/07) |
