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Test batteries without a voltmeter - 11/09/00 EDN-Design
Ideas....The circuit in Figure 1 is an easy approach to testing batteries
without exiting the voltmeter. The battery holders in sizes AAA, AA, C, and
D make this tester so much faster than a voltmeter....PDF contains multiple
circuits, scroll to find the one of interest.... [Design Idea by Nam Phan,
Pasadena, CA] |
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Test Timer - The output
goes high for a fixed period of time when power to unit under test (UUT)
is turned on, and again when it is turned off. It was used with a
magnetic sensor to test the spin-up and spin-down time of a gyroscope.
[Designed by Andrew R. Morris] |
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Test Video A/D Converters Under Dynamic Conditions - AN-297-Analog
Device Application Notes....[App Note] |
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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….
[Design Idea by William Dias, Brown&Sharpe, North Kingstown, RI] |
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Testing & Troubleshooting Digital RF Communications Receiver Designs -
Aligent Application Note (app note added 04/05/06) |
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Testing CDMA Base Station Amplifiers - Aligent Application Note (app
note added 6/07) |
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Testing inductors at application frequencies - Coilcraft RF Magnetics
Application Notes -(added 6/06) |
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Testing Linearity of the LTC2400 24-Bit No Latency Delta SigmaTM A/D Converter Help
from the Nineteenth Century - Design Solutions 11 Design Notes (Linear
Technology) (app note added 2/06) |
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Testing of COP400 Family Devices - National Semiconductor Application Note
(app note added 2/06) |
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The experimenter’s pot-Digital Potentiometer - ….... [Site is under
construction right now] |
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The Ultimate Universal Remote Control - Gadget Freak Case 147: Couch
potatoes should be particularly interested in Bill Bowden's remote control IR
receiver, which allows users to control the power of virtually any electrical
appliance (including those not equipped for remote) using their standard remote
control. It's based on an IR receiver circuit, |
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Thermal Techniques in Measurement & Control Circuitry - AN5 Linear
Technology 6 applications utilizing thermally based circuits are detailed. Included
are a 50MHz RMS to DC converter, and anemometer, a liquid flow meter and others. A
general discussion of thermodynamic considerations involved in circuitry is also
presented. |
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Three Channel Spectrum Analyzer - ….(Circuit design added 03/08)
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Three Level Audio Power Indicator - Battery-operated3 LED display that
connect it to loudspeaker output (added 04/02) |
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Three-Level Audio Power Indicator - Battery-operated 3 LED display.
Simply connect it to loudspeaker output. (electronic circuit added 06/07/08)
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Tilt/fall detector has staggered thresholds - 18-Feb-10 Issue of EDN
Comparators and a voltage-divider network let you set threshold levels.... [Design
Idea by Marián Stofka, Slovak University of Technology, Bratislava, Slovakia] |
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Time Domain Reflectometer - Brief description of operation: Pulse source for
time domain reflecometry. Circuit protection: Output is short circuit proof.
Circuit complexity: Simple one IC construction, can be built on small piece of Vero
board. Circuit performance: Works very well with cables from 5 meters to 500
meters (no longer cables tested, should work for up to.... |
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Tiny pH Meter - This tiny pH-meter is very tiny: 11cm2 including the PSU
circuit! I built it for the College Saint Pierre a few years ago. It is based on a
circuit developped at the Facultes Notre-Dame de la Paix, Namur, Belgium. I modified
several components to allow a smaller power supply.... |
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Tiny Pulser - The author repeatedly needed several different digital signals
for testing his circuits, and a simple function generator did not provide a
satisfactory solution. He quickly developed a design for a pulse generator….must
register on this site.... [Published in Elecktor July/August 2010] |
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Tiny twisted-pair transmission line solves test-fixture woes - 16-Dec-05
Issue of EDN Commonly available wire fits in tight spots.... [Design Idea by
Glen Chenier, Allen, TX; Edited by Brad Thompson and Fran Granville] |
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TL431 Battery Voltage Monitor - Monitor the voltage of a battery or battery
bank using an TL431 (aka LM431) shunt regulator…. [REUK - Renewable Energy UK website] |
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Trace voltage-current curves on your PC - 11-Oct-01 Issue of EDN Some
years ago, one of the fundamental electronic instruments was the laboratory curve
tracer. A CRT display would sweep out terminal behavior (current versus voltage] from
which you could derive mathematical models. Classic presentations of diodes,
transistors, and other devices enlightened designers about linear and nonlinear
operation.... [Design Idea by Clayton Grantham, National Semiconductor, Tucson, AZ] |
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Track multisite temperatures on your PC - 18-Apr-02 Issue of EDN The
low-cost circuit in Figure 1 allows you to track four remote temperatures with
thermistor sensors through the parallel port on your PC. This four-zone
thermometer instrument has a temperature range of -40 to +90°C and a resolution of
better than ±1°C. You can calibrate its accuracy to within 1°C over a 0 to 50°C span
and within 3°C over a -40 to +90.... [Design Idea by Clayton Grantham, National
Semiconductor, Tucson, AZ] |
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Tranistorized Dip Meter - This dip meters use 2SC2369 transistor for RF
Oscillator and 2SC458 for AM Tone Oscillator. VR 10 K potentiometer is a linear type
it adjust the working voltage of the RF oscillator part from 0~9 Volt DC, [hk@ardiwinata.net] |
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Transformerless Power Supply (Aaron Cake) - I have received a few emails
asking for a transformerless power supply. Here is such a supply. This supply
uses no heavy step down transformer and has an extremely low parts count. The circuit
can be built very small and can supply small currents for small projects. The major
downfall of this supply is that it is not isolated from the AC line and can only
supply small currents.... |
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Transformerless Power Supply (jose pino) - Simple, low cost and easy to
build power supply. Ideal for applications that doesn't requiere too much power.
(5/28/2006) |
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Transformerless Power Supply (Len Galasso) - This power supply uses the
reactance of a non-polarized capacitor at 60hz to step-down the voltage from the
normal 117VAC level to about 20 volts or so, which is rectified by the diode….(Circuit
design added 7/06) |
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Transformerless Power Supply (Ron J) - This circuit will supply up to about
20ma at 12 volts. It uses capacitive reactance instead of resistance, so it doesn't
generate very much heat. The circuit was desigusing an optically-isolated triac....(added
6/03) |
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Transient test correctly-models nonlinear parts - 11/23/94 EDN-Design
Ideas.... EDN is migrating links. This link is not verified. Search the "title"
+ "EDN" for new link. |
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Transistor junction monitors remote temperature - 06/22/00 EDN-Design
Ideas....The circuit in Figure 1 uses a regular, general-purpose transistor as the
sensing element and a thermal-diode monitor IC to measure temperature. The ADM1021
usually connects to an on-chip thermal diode on a CPU die itself, but in this
application the sensor connects to a regulator low-cost discrete npn transistor, the
2N3904.... [Design Idea by Matt Smith, Analog Devices, Limerick, Ireland] |
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Transistor quickly wakes sleeping LDO - 09/01/98 EDN-Design
Ideas....Portable systems, such as telephone handsets, make extensive use of
low-dropout (LDO] regulators. These components provide noise-sensitive parts
with a stable power-supply line. When a telephone enters standby mode, most of the
circuits go to sleep by disabling the LDO's outputs. Operating....File has many
circuits, scroll down.... [Design Idea by Christophe Basso, Motorola Semiconductor,
Toulouse, France] |
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Transistor Spot Checker - (circuit added 07/07/07) |
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Transistor Tester - …. |
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Transistor Tester & Signal injector - There have been a lot of transistor
tester circuits in recent electronics magazines, but this one is different. It has
more features and includes a signal injector so you can test audio sections of radios
and the front end of FM transmitters etc....(electronic design added 02/03/04)
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Transistor tester fits into your pocket - 20-Dec-01 Issue of EDN It
can be helpful to rapidly and easily determine the polarity (npn or pnp] and function
of a transistor. The pocket-transistor tester in Figure 1 is ideal for quickly testing
without regard to such parameters as gain and frequency response. You connect the
transistor, or device under test, between the collectors, T, of an astable
multivibrator.... [Design Idea by Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland] |
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Transistor Trio Makes Vector Anemometer - 09/01/97 EDN-Design Ideas....A
previously published Design Idea (Reference 1] uses a heated transistor as an
airspeed-to-frequency converter. Because it uses only one transistor, the circuit
cannot determine the direction of airflow. Alternatively,.... [Design Idea by W
Stephen Woodward, Chemistry Department, University of North Carolina--Chapel Hill] |
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Transistor & FVCs Make Linear Anemometer - 09/26/96 EDN-Design
Ideas....The basic operation of this front-end sensor is identical to that of the
earlier circuit. Q1 is the self-heated airflow sensor; Q2 senses ambient temperature.
Zero-adjust resistor R2 sets the zero-airflow quiescen.... EDN is migrating links.
This link is not verified. Search the "title" + "EDN" for new link. |
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Transition counter gauges thermal stability - 01/04/96 EDN-Design
Ideas....The transition count of Figure 1is an easy way to determine if the
temperature in a heater is stable. The stable state maximizes the transitions. This
circuit works like a digital filter with controlled frequencies and is simpler than
many other analog- and digital-circuit alternatives....[Design Idea by Jose Luis Arce,
Tecnosuma Havana, Cuba] |
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Transmission Line Characteristics - National Semiconductor Application Note
(app note added 2/06) |
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Transmission Line Enclosure Speakers - Built for my Ambisonic surround rig,
and an interesting project. But don't do this unless you're clinically insane; Buy
them instead. (electronic circuit added : 08/08/08) |
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Transmission Line Terminations - ....(spice design added 02/09) |
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Transmission line tests 1 kW device using only 100W - 20-Feb-03 Issue of EDN
A 13.56-MHz, ISM (industrial, scientific, and medical]-band RF-measurement device had
the test requirement of a 50-hour, 1-kW burn-in. The device under test needed to be
simultaneously stressed at an RF potential and RF current equivalent to 1 kW, but the
only spare RF source at hand was a 100W RF generator.... [Design Idea by David
Cuthbert, Meridian, ID] |
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Transmission lines simulate digital filters in PSpice - 17-Apr-08 Issue of
EDN You can simulate digital filters in PSpice by using transmission lines as
delay elements.... [Design Idea by David Báez-López, Department of Electrical and
Computer Engineering, Ryerson University, Toronto, ON, Canada] |
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Transmitter accurately transfers voltage input - 15-May-03 Issue of EDN
When you connect remote sensors to a central process controller, a simple, robust, and
commonly used interface is the 4- to 20-mA loop. The advantages of this current loop
include the simplicity of just two twisted wires that share both power and signal, the
loop's high noise immunity in harsh environments, and the de facto loop standard
within the process-control industry.... [Design Idea by Clayton Grantham, National
Semiconductor, Tucson, AZ] |
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Triac Test - These two testing procedures are for use with a digital
multimeter in the Ohm's test-range. Testing procedure was actually designed for
testing inside micro-waves (magnetrons), but should be no difference in any other
circuit. Test inor out circuit….. [Tony van Roon's circuit] |
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Triac tester allows for manual or automatic operation - 20-Aug-09 Issue of
EDN Build a simple triac tester with a switch or an automated tester with a
microcontroller.... [Design Idea by Abel Raynus, Armatron International, Malden, MA] |
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True RMS Detector - National Semiconductor Application Notes,28-Jun-1996 /
(app note added 6/02) |
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TTL Pulse Reading Logic Probe - This circuit uses LEDs to display logic
states for high, low, rising pulse, and falling pulse, it is generally useful for
debugging logic circuitry…. [G. Forrest Cook] |
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TV Oscilloscope Adaptor - This is an adapter attached to a TV set.
This machine changes a TV to a Oscilloscope. See the photo!This photo indicates a sine
wave 50mV 120Hz. See the circuit! Free oscillater makes an 15kHz pulse signal (A).
This signal is amplified by an buffer AMP. On the other hand , an amplifier makes 300
times of input signal. And it is shifted to 6V center. A comparater ….(electronic
schematic added 11/08) |
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TV Oscilloscope Adaptor #2 - Low frequency TV Oscilloscope (circuit added
8/06) |
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Two Crystal Test Circuits - Two simple test circuits to check operation of
quartz crystals….(circuit added 09/09/09) |
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Two Sensors Measure Three Line Currents - 09/01/95 EDN-Design Ideas.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Two Tone Audio Oscillator use for SSB Tests - amateur radio construction
projects…. [from Peter Parker's website] |
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