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Simple dual constant-current
load tests low-current power supplies - 21-Jun-07 Issue of EDN
You can use a simple 9V-battery-powered constant-current load to test small
power supplies at various loads.... [Design Idea by John S Lo Giudice,
STMicroelectronics, Schaumburg, IL] |
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Simple Electronic S Meter - Many amateurs who would like to add
some type of S meter to their favorite QRP project are often stunned at the
high cost of panel meters. Figure 1 provides a low cost alternative and
helps to demonstrate operational amp principles. Although this S meter has
only 4 leds, this is often enough to distinguish the weak from the strong
signals.... [Radio Amateur Society of Norwich BY Mike Martell N1HFX] |
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Simple emulator speeds testing - 25-Sep-03 Issue of EDN
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 are often expensive, hard to use, and sometimes inappropriate
for use by hardware developers,.... [Design Idea by Navdhish Gupta, Chicago,
IL] |
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Simple 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.... EDN is migrating links. This link
is not verified. Search the "title" + "EDN" for new link. |
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Simple Field Strength Meter - This Field Strength Meter is simple and also
quite sensitive. It uses an ordinary digital voltmeter to measure RF signal strength
up to a few hundred MHz…. [Designed by Andy Collison] |
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Simple Logic Probe uses Bicolor LED - 03/13/98 EDN Ideas....A project posed
the challenge of replacing existing analog potentiometers (used to set brightness and
contrast levels]in video monitors with digitally controlled potentiometers. The
different brands and models of monitors presented widely varying voltages across the
potentiometers. The design….PDF has several circuits, scroll to this one.... [Design
Idea by Mark Shill, Burr-Brown Corp, Tucson, AZ] |
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Simple MIDI Tester - Sometimes when experimenting with different soundcards
and MIDI interfaces it is useful to see if there is some data going in MIDI interface.
This can be easily tested with this adapter, which converts the midi signals to
visible light pulses. Just the circuit and plug it to the MIDI output of....(added
4/05) |
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Simple Phase Meter Operates to 10 MHz - 07/04/96 EDN-Design Ideas....You
need phase measurements to set up and verify electronic devices in amplifiers and in
audio, control, ultrasound, and echo systems. Phase measurements can be problematic,
because not many simple, inexpensive phase meters are available. Moreover, using an
oscilloscope is time-consuming and imprecise. The phase meter described.... [Design
Idea by Ronald Mancini, Harris Semiconductor, Melbourne, FL] |
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Simple polarity detector (Aaron Cake) - This tester can be used to check the
polarity of any power source, and is therefore very useful when installing automotive
equipment, alarm systems or anything else you can think of. Because this circuit is so
simple and cheap, even frying one with an over voltage is not a big deal....(added
6/05) |
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Simple procedure tests transducer - 03/01/96 EDN-Design Ideas....Testing
electromechanical transducers can be as simple as measuring a dc voltage. The circuit
in
Figure 1 and an accompanying test method enable you to measure the damping
coefficient ([beta]) of speakers, microphones, seismic geophones, and other
transducers that exploit electromagnetic phenomena. You can also tailor this method
for testing electrostatic devices, such as capacitive micromachined sensors. In
general, you can measure the damping in any second-order system or signal, which
conforms to the following basic equation for the free transient process...[Design Idea
by Alexander Belousov, SMP Inc Long Island City, NY] |
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Simple Remote Control Tester - Here is a handy gadget for test- ing of
infrared (IR) based re- mote control transmitters used for TVs and VCRs etc. The IR
signals from a remote control transmitter are sensed by the IR sensor module in the
tester and its output at pin 2 goes low. This in turn switches on transistor T1 and
causes LED1 to blink. At the same time, the buzzer beeps at the same rate as the
incoming signals from the remote control transmitter.... |
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Simple RF Power Meter - Here is a simple set up which will enable them to
measure the out put power of their transmitter. All that they require is a good
multimeter which has a sensitivety of 20k ohms/4 Watts which is adequate for low power
transmitters. (electronic circuit added 9/04) |
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Simple scheme detects shorts - 07/08/99 EDN-Design Ideas....When you
manually assemble complex boards, it's common to short-circuit adjacent component or
IC pins. Determining which section of the circuit you have shorted is not too
difficult, but finding the precise point where the short exists can be a formidable
task,....[File contains multiple circuits. Scroll to find this one.].... [Design
Idea by Luis Miguel Brugarolas, SIRE, Madrid, Spain] |
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Simple Servo Tester - …. |
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Simple setup tests-bit error rate - 18-Mar-04 Issue of EDN
Traditionally, the reception quality of a digital receiver is expressed in terms of
BER (bit-error rate]. This figure is the proportion of received bit errors in a
given period. Typically, you measure the BER in the lab by applying an RF signal,
modulated by a pseudorandom code, to the receiver under test.... [Design Idea by
Israel Schneiderman, Rosslare Israel Ltd, Rosh Ha'ayin, Israel] |
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Simple Technique Measures Small Capacitance - 09/01/97 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Simple tester checks Christmas-tree lights - 12/23/99 EDN on Components
Why is it that you always test 48 bulbs before you find the bad one in a 50-light
string?This simple circuit allows you to divide and conquer, greatly reducing the time
it takes to find the bad bulb. [Design Idea by William Dias, Brown&Sharpe, North
Kingstown, RI] |
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Simple tester checks LCDs |
| - 3-Oct-02 Issue of EDN Manufacturers
of electronic equipment use LCDs for calculators, watches, mini-videogames, and
pagers, for example. In comparison with LED-based displays, which consume power on the
order of tens of milliwatts, an LCD consumes only a few microwatts. [Design Idea by D
Prabakaran, NL Polytechnic College, Tamil Nadu, India] |
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Simple Voltmeter Monitors TTL Supplies - National Semiconductor Application
Note (app note added 2/06) |
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Simpson 260-6P VOM manual w/schematic - (circuit added 07/07/07)
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Simulate signals for telecomm tests - 9/11/98 EDN-Design Ideas....The
circuit in Figure 1 is a miniature gadget that is helpful in telecommunication
applications. The function of the device is to simulate data flow with predefined
patterns and use these patterns to check a cable's or a receiver's functionality. The
circuit generates a signal in accordance....File has several circuits, please scroll
to find this one.... [Design Idea by Samuel Kerem, Patton Electronics, Gaithersburg,
MD] |
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Sine Wave Generator (Andy Collison) - A classic Wien Bridge oscillator using
an Op-Amp covering a frequency range of 15 to 150kHz in four switched
steps…..(electronic schematic / circuit added 4/02) |
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Single IC forms inexpensive inductance tester - 2-Aug-07 Issue of EDN
A simple Pierce oscillator measures the inductance of a device under test.... [Design
Idea by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy] |
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Single switch controls digital potentiometer - 19-Sep-02 Issue of EDN This
Design Idea is an evolution and simplification of another (Figure 1, Reference 1].
Replacing the three inverted-input NOR gates with their logical equivalents,
positive-input NAND gates, makes these three gate symbols consistent with the fourth,
which was drawn as a positive-input NAND gate. The 74HC132's data sheet describes the
device as a quad, two-input NAND gate with hysteresis.... [Design Idea by im Bach,
Delphi Delco Electronics Systems, Kokomo, IN] |
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Single-chip Digital voltmeter - This 4 1/2-digit DVM circuit is built around
a Maxim ICL7129ACPL A/D converter and LCD driver….(schematic / circuit added 6/07)
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Single-supply circuit measures –48V high-side current 02/21/08 EDN-Design
IdeasThis circuit measures –48V high-side current using a single positive supply….
[Design Idea by Wenshuai Liao, Analog Devices, Beijing, China; Stephen Lee, Analog
Devices, Wilmington, MA; and Yanhui Zhao, Beihang University, Beijing, China] |
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Single-switch controls digital potentiometer - 7-Feb-02 Issue of EDN
The control of electronic potentiometers in most today's applications comes from
controller-generated signals. However, a significant number of applications exist that
require adjustments using manual, front-panel controls. The circuit in Figure 1 uses
one IC, one switch, and 10 discrete components.... [Design Idea by Chuck Wojslaw and
Gary M Craig, Catalyst Semiconductor, Sunnyvale, CA] |
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Slew Rate Verification for Wideband Amplifiers - AN94 Linear Technology
Wideband amplifiers achieve slew rates beyond 2500V/µs. Verifying slew rates at this
speed requires special techniques. In particular, a subnanosecond rise time input step
is necessary for accurate slew rate measurement. A pulse generator with a 360
picosecond rise time is shown,.... |
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SmartCard PC Emulator - ….... |
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Software Download AN-624 - Soft Analog Devices Application
Notes....[App Note]This program controls and reads data from the Analog Devices
ADE7754 Polyphase energy metering IC to perform the calibration of a three-phase
energy meter. It is designed for use with the EVAL-ADE7754EB (evaluation board)
. Use it in conjunction with Application note AN-624. |
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Software Download txt, 90,167 bytes - Soft Analog Devices Application
Notes....[App Note]This program controls and reads data from The Analog Devices
ADE7756 Single Phase, Bi-Directional Power/Energy IC to measure Active Energy, Voltage
RMS and Current RMS. Use it in conjunction with Application note AN-578. |
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Solar Cell Test Fixture - If you are considering building your own solar
panel, you might try building the solar cell tester shown below. When constructing a
solar panel it is important to make sure that all the solar cells used in the panel be
closely matched for their short circuit current. One weak cell will lower the
efficiency of the whole panel. The system shown allows individual solar cells to be
tested for their short circuit current under a constant light intensity condition....
[Hobby Corner Circuit by Dave Johnson] |
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Solar Current Meter - This circuit is used to measure the current from a
solar panel. It has very low power loss for currents in the 0-10A range. It also works
as a general purpose DC current meter. The circuit can be used on either the positive
or negative side of a DC circuit.... [G. Forrest Cook] |
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Solar Panel Current Meter - This circuit is used to measure the current from
a solar panel. It has very low power loss for currents in the 0-10A range. It also
works as a general purpose DC current meter. The circuit can be used on either the
positive or negative side of a DC circuit [Designed by G. Forrest Cook] |
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Solar PV Cell Test Fixture - This is an illustration of a test fixture,
which can be used to test individual solar cells for short circuit current.
Using a PIN photo diode and a control circuit, the solar cells can be tested under
constant light level conditions. A halogen incandescent lamp is used as the light
source.... [Designed by David A. Johnson] |
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Solar Shed Lighting Circuit Testing - Analysis of a typical solar shed LED
lighting circuit…. [REUK - Renewable Energy UK website] |
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Some simple test equipment to build - amateur radio construction projects….
[from Peter Parker's website] |
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Some test equipment to build - amateur radio construction projects…. [from
Peter Parker's website] |
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Sound Level Meter - One chip replacement for the standard analog meters,
based on LM3915 audio level IC.… [Aaron Cake's design] |
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Sound Pressure Level Meter - The Schematic and PCB have now been CompletedIt
All works well....(Circuit design added 12/08) |
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Soundmeter - A simple soundmeter using the PIC 16F628 or 16F84 (electronic
schematic added 05/06) |
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Spark detector uses proximity - 27-Nov-08 Issue of EDN Use a
Hall-effect sensor to measure engine rpm with a voltmeter.... [Design Idea by Robert
Most, Ferris State University, Big Rapids, MI] |
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Spectrum analyser provides faster measurement - 04/01/99 Issue of EDN
Hewlett-Packard’s ESA-E spectrum analysers (Picture] let you perform measurements in
less time and access a range of software routines to aid common measurement tasks.
Five models cover 1.5 to 26.5 GHz; they have 5-msec full-span RF sweep times and can
repeat measurements as fast as 28 times/sec. Span accuracy from the synthesized source
is ±1%, and amplitude accuracy is ±1 dB. Ultimate....Page includes several designs.
Scroll to find this one....(EDN Design Ideas] [Design Idea by Graham Prophet] |
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Spectrum Analyzer Measurements & Noise - Aligent Application Note (app
note added 6/07) |
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Speed IM testing - Application Note MiniCircuits.com (app note added
04/05/06) |
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Sprague TO-5 Tel-Ohmike capacitor analyzer manual w/schematic - (circuit
added 07/07/07) |
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Sprague TO-6A Tel-Ohmike capacitor analyzer manual w/schematic - (circuit
added 07/07/07) |
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Standardized Core Makes Building & Supporting a Functional Test System Easier & Less
Costly - Agilent Application Note (added 6/06) |
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Star Delta Wiring Calculator - An online calculator to work out the output
voltage and current for an alternator wired in star or delta configuration…. [REUK -
Renewable Energy UK website] |
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Stereo Test Tone Generator - The purpose of this circuit is to create a pair
of sine waves for testing stereo equipment. While it is useful for many types of audio
test tone generation, the circuit is specialized for the purpose of aligning an[[../fmst/index.html|FM
Stereo Modulator]], like the type used in low power FM stereo transmitters. Two tone
outputs are available, the low tone has a secondary output that is 180 degrees out of
phase with the primary output. The circuit is also handy for testing computer sound
card inputs. [G. Forrest Cook] |
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Storage Oscilloscope Adapter - Yes, it's finally here !. The DSOA Mk3 has
been a long time coming (many years in fact), but it was finally published in the
October/November 98 issues of EA. EA October 98 issue cover shot of DSOA Mk3 Here are
the basic specs….(electronic schematic added 11/08) |
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Stress Meter - This project comes with all parts, PC board and a
pre-programmed chip for STRESS METER. But you are encouraged to add more sub-routines
to the program and learn to program the chip yourself. You will need the "Chip
Programmer Model F" and the software provided below....(Circuit design added 05/07)
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Suddent ionospheric disturbance (SID) receiver - Schematic only, no circuit
description included…. |
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Super Probe, 16 functions with very few parts - The Superprobe project was
designed to see how much could be done with a PIC chip and just a few parts. The image
at the right shows the capacitance measuring mode. This device is designed
around a PIC16F870, a 4 digit LED display module and very little else.
[img:eb8cceb438]http://www.circuitdb.com/download.php?fileID=135[/img:eb8cceb438]
[i:eb8cceb438]Note: I have recieved a lot of inquiries on this project. To date,
several have been duplicated world-wide. Many have been constructed in other types of
cases. As long as the circuit is wired as shown, and the object code (below) is....
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Super Simple SONAR - Thomas Scarborough's electronics design have been
popular. Here, therefore, is a “super simple” SONAR (designed by him). SONAR stands
for SOund NAvigation Ranging. It is a technique which is used to determine the
distance and direction of objects by acoustic means -- usually in water, but also in
air. The SONAR described here has the most basic functionality -- it simply reports
the existence of an object up to a few metres’/yards’ distance. It would, for example,
shriek when a reversing vehicle approached a wall (X1 and X2 would be mounted just far
enough apart NOT to shriek until the.... |
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Supervisory circuit monitors-modem connection - 04/09/98 EDN-Design
Ideas....In telemetry or security applications in which a modem connection
automatically establishes itself between two systems, a failure in one of the systems
can interrupt the data exchange while the connection remains established until someone
physically breaks the line or restarts the failed system. This
situation....several circuits included, scroll the find this one.... [Design Idea by J
Bas�lio Sim�es and Jorge Landeck, Instrumentation Center of the University of Coimbra,
Coimbra, Portugal] |
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Supervisory IC Makes Simple Line Monitor - 03/01/96 EDN-Design Ideas.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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S-video to RCA - …. |
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Switch on delay circuit - Schematic only, no circuit description
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Sylvania 145 Audio Oscillator schematic - (circuit added 07/07/07)
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Synthetic Isolators-great for checking the SWR of antennas, Amplifiers, mixers, etc.
- (circuit added 07/07/07) |
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System Cabling Errors & DC Voltage Measurement Errors in Digital Multimeters
5988-5511EN - Aligent Application Note 1389_1 (app note added 4/08)
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