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Machine Vibration Activates Hour Meter - 01/16/97 EDN-Design
Ideas....Battery-powered digital hour meters commonly monitor how long a
machine is in operation by detecting when the machine is supplied with
power. However, it is often difficult or dangerous to connect a
battery-powered hour meter to a line-powered machine. When the machine being
monitored.... [Design Idea by David Johnson, P.E. www.discovercircuits.com] |
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Magnetic field probe requires few components - 15-Dec-06 Issue of
EDN Hall-effect sensor and DMM explore stray fields.... [Design Idea
by Sandeep M Satav and VV Rama Sarma, EMI-EMC Centre, RCI, Hyderabad, India;
Edited by Brad Thompson and Fran Granville] |
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Magnetometer - .... |
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Mains Voltage Indicator - The solidstate voltmeter circuit
described here indicates the mains voltage with a resolution that is
comparable to that of a general-purpose analogue voltmeter. The status of
the mains voltage is available in the form of an LED bar graph....
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Make a Low Cost Benchtop Power Meter - 09/11/98 EDN-Design Ideas....With a
few inexpensive ICs and passive components, you can easily make a multirange power
meter suitable for use on your benchtop. The circuit in Figure 1 measures currents
from microamps to amps and voltages as high as 100V. The voltage at VOUT, which you
can monitor with a DVM, indicates the load's power. Two….File has many circuit, please
scroll down.... [Design Idea by Jim Todsen, Burr-Brown Corp, Tucson, AZ] |
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Make Your Own Shunts - Using a modern multimeter to measure current can
sometimes be difficult. Many of these meters will only measure up to one amp.
However, may 112-volt DC powered projects draw a lot more than that. If you have ever
thought of purchasing a commercial shunt to solve the problem, your know just how
expensive they can be.... [Tony van Roon's circuit] |
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Making Differential Probes - For sensing audio signal voltages across
devices that are not ground referenced (added 6/03) |
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MAR/RAM Test Fixture Instructions - Application Note MiniCircuits.com
AN-60-018 (app note added 04/05/06) |
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M-Audio Recorder Use - It easily outperforms my soundcard! But there is a
problem (as usual). The device emits a huge amount of hum and buzz and a receiver
can't be anywhere near it. A lot of it sounds just like 60 Hz line noise, too, making
it more confusing. I came up with a solution that completely eliminates the
interference....(electronic design added (6/07) |
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MAV Test Fixture Instructions - Application Note MiniCircuits.com (app
note added 04/05/06) |
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MAX6953 Development board - ….(electronic schematic added 08/08) [Site is
under construction right now] |
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Measure humidity and temperature on one TTL line - 30-Aug-01 Issue of EDN
By combining the responses of an Analog Devices (www.analog.com] AD590 temperature
sensor and a Humirel (www.humirel.com] HS1101 humidity sensor, you can generate a
single TTL-level signal containing information from both sensors (Figure 1).
This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running
oscillator.... [Design Idea by Shyam Tiwari, Sensors Technology Pvt Ltd, Gwalior,
India] |
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Measure Inductance with DC Superimposed - 07/06/95 EDN-Design Ideas....
[Design Idea by HB Farensbach, Consultant, Albano, Italy] |
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Measure nanoamps to ensure accurate computer clocks - 05/10/07 Video Design
Ideas-EDN In this EDN Video Design Idea, Jim Williams, staff scientist with
Linear Technology, explains why PC clocks are invariably wrong, and how engineers can
surmount the extreme measurement challenge involved in solving the problem.
(electronic Design Idea added 9/08] EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
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Measure open circuited cables using a multimeter - 26-Sep-02 Issue of EDN
You can use a multimeter with capacitance-measurement capability to measure the length
of wire or cable to an open circuit. The capacitance of a pair of wires (or a wire to
a shield] is directly proportional to the length of the wire. If you know the
capacitance per foot of wire, then you can calculate how far it is to the open
circuit.... [Design Idea by Ron Duffy, Agilent Technology, Colorado Springs, CO] |
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Measure power-line distortion with a mixed signal THD analyzer - 22-Nov-07 Issue
of EDN A mixed-signal total-harmonic-distortion-analyzer device measures the
distortion of the mains ac voltage.... [Design Idea by John R Ambrose, Mixed Signal
Integration, San Jose, CA] |
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Measurement methods - Application Note MiniCircuits.com (app note
added 04/05/06) |
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Measuring Input & Output Impedance - From the AC impedance triangle, the
input or output impedance of a two terminal network can be determined by measuring the
small signal AC currents and voltages. For the input, the voltage is measured across
the input terminals and the current measured(Circuit design added 07/07/07)
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Measuring Jitter in Digital Systems AN 1448-1 - Agilent Application Note
(added 6/06) |
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Measuring RF Voltages with a VOM - .... |
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Measuring self resonant frequency - Coilcraft RF Magnetics Application Notes
-(added 6/06) |
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Measuring sensitivity of transponder coils - Coilcraft RF Magnetics
Application Notes -(added 6/06) |
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Measuring the Capacity of a Battery - Find out how to measure the capacity
of a battery…. [REUK - Renewable Energy UK website] |
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Measuring the speed of light with Chocolate Chips 21 - Over the past week,
I’ve been really busy with exams and projects. Trying to save time by finding the
speed of light on Google, I stumbled upon an extremely interesting article on
measuring the speed of light with a microwave. As any decent cook knows, microwaves do
not heat evenly. In fact, this article explains their heating patterns are relative to
the speed of light!....(project added 6/07) |
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Mercury battery replacement - Many old cameras and other devices used
mercury batteries, which are no longer available. Here is an analysis of the problem,
and a few solutions. [Manfred Mornhinweg] |
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Mercury Battery replacement For Antique Instruments - I have recently been
trying to restore a Radector radiation survey meter, vintage 1950s. This instrument
uses a 10 atmosphere argon filled ion chamber as the radiation detector and has an
electrometer type vacuum tube sealed inside the chamber. The design is simple
and, for the time, quite elegant. Unfortunately it.... |
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Method simplifies testing high Q devices - 21-Feb-02 Issue of EDN The
design of low-phase-noise oscillators requires careful attention to resonator unloaded
Q. In the construction of a low-phase-noise, high-frequency oscillator, the goal is to
achieve an unloaded-Q figure greater than 400 in a reasonable package. Also, you need
to monitor the effect of the package and pc-board arrangement.... [Design Idea by Alan
Victor, IBM Microelectronics, Research Triangle Park, NC] |
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Method Tests Cables - 10/17/02 EDN-Design Ideas....Engineers have long known
how to test a cable for continuity by simply connecting all conductors in series and
checking with an ohmmeter. This method is sometimes impractical, however,
because it cannot check for short circuits. The method shown in Figure 1 solves the
short-circuit problem. Connecting.... [Design Idea by Jim Keith, Bell-Mark
Technologies, Dover, PA] |
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Mic Circuit Tester - Small oscillator to check mic & line circuits during
sound setup. 440 Hz Tone generator for testing XLR microph1-lines (added 5/02)
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Microcontroller functions as voltmeter - 10-May-07 Issue of EDN PIC
microcontroller and FETs enable a four-digit voltmeter.... [Design Idea by Noureddine
Benabadji, University of Sciences and Technology, Oran, Algeria] |
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Microcontroller serial port measures pulse width 07/15/10 Issue of EDN Many
industrial and instrumentation systems need to measure the duration of pulse inputs,
such as frequency from rotational-speed sensors, gating and strobe pulses from
external systems, and PWM (pulse-width-modulated) inputs. Designers generally use
on-chip timers and edge-driven interrupts for this purpose. If one of these components
is unavailable, however, you can employ an unused on-chip serial- synchronous receiver
to make those measurements.…. [Design Idea by Vishwas Vaidya, Tata Motors Ltd, Pune,
India] |
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MicroController simplifies battery state of charge measurement - 04/26/07
EDN-Design Ideas…. EDN is migrating links. This link is not verified. Google the
"title" + EDN for new link. |
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Microcontroller, JFET form low-cost, two-digit millivoltmeter - 22-Jun-06
Issue of EDN Software subroutines replace hardware A/D converter.... [Design
Idea by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria;
Edited by Brad Thompson and Fran Granville] |
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Microphone Polarity Tester - (electronic schematic / circuit added 4/02)
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MIDI interface/cable Tester - (circuit / schematic added 6/05) |
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MIDITester - (circuit / schematic design added 6/06) |
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Millen 90501 Secondary frequency standard schematic - ....(electronic
circuit added 07/07/07) |
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Millen 90651 Grid-dip meter manual w/schematic - (circuit added 07/07/07)
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Millen 90651A grid-dip meter schematic - ....(electronic circuit added
07/07/07) |
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Millen 90652 solid-state dipper schematic - ....(electronic circuit added
07/07/07) |
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Millen 90662A grid-dip meter schematic - ....(electronic circuit added
07/07/07) |
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Millen 90903 oscilloscope (new version) schematic - ....(electronic circuit
added 07/07/07) |
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Millen 90903 oscilloscope (old version) schematic - ....(electronic circuit
added 07/07/07) |
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Millen 90912 instrumentation oscilloscope schematic - ....(electronic
circuit added 07/07/07) |
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MilliGauss Meter - The circuit provides an easy yet reliable way to detect
the intensity of a.c. (or e.l.f.) fields around the home or workplace. It is doubly
effective because it does not merely detect the electromagnetic radiation emitted by
electrical appliances, but the electromagnetic energy actually absorbed by the body.
The circuit in is a standard charge pump....(electronic design added 9/02)
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Mini DDS direct Digital Synthesizer - .... |
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Missing codes Tester checks 16 Bit ADC in 7 sec - 06/10/99 EDN-Design
Ideas....As the resolution of ADCs increases from 12 to 16 bits and higher, the
difficulty in testing the "nomissing-codes "specification grows proportionately. To
fully guarantee no missing codes for a 16-bit ADC requires testing all 2 16-1 possible
output.... EDN is migrating links. This link is not verified. Google the "title"
+ EDN for new link. |
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Mixed Signal Testing using the IEEE 1149.4 STA400 - National Semiconductor
Application Note (app note added 2/06) |
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Modified Scope Probe Tests Surface Mount Assemblies - 09/25/97 EDN-Design
Ideas....he small sizes and pad areas of surface-mount components make them difficult
to probe. Typically, when you use an oscilloscope probe, it is difficult to keep the
probe tip and ground bayonet from slipping off the pad areas of the surface-mount
devices. The modified oscilloscope probe.... [Design Idea by Robert Buono, Mahwah, NJ] |
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Modulated Laser Diode Tester - This circuit can either be used to test laser
diodes or as a general purpose modulated light source. The circuit has an adjustable
diode threshold current and an adjustable modulation frequency. The frequency can be
adjusted from below 30KHz to above 50MHz. It is powered from a 9v battery. …. [Hobby
Corner Circuit by Dave Johnson] |
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Monitor alarm and indicator
display multiple deviation boundaries - 22-April-10 Issue of EDN-Design
Ideas....Use a microcontroller and its ADCs to indicate process errors. [Design Idea
by William Grill, Riverhead Systems, Lenexa, KS] |
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Monitoring Additional Supplies with the ADM1062-ADM1069 Super Sequencers™ -
AN-781 Analog Devices Application Note....[App Note] |
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Monitoring High Voltages with the ADM1062-ADM1069 Super Sequencers™ - AN-782
Analog Devices Application Note....[App Note] |
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Monitoring Negative Voltages with the ADM1062-ADM1069 Super Sequencers™ -
AN-780 Analog Devices Application Note....[App Note] |
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Morse Monitor - Electroinic design circuit…. [from Harry Lythall's website] |
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MOSFET Tester - This testing procedure is for use with a digital multimeter
in the diode test-range with a minimum of 3.3 volt over d.u.t. (Tony van Roon's
diode-under-test). If your multi-meter is less than that it will not do the
test. Check your meter manual for the specs….. [Tony van Roon's circuit] |
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Moving coil meter measures low-level currents - 3-Mar-05 Issue of EDN
Although an analog moving-coil meter may lack the resolution and accuracy that a
digital readout provides, a meter remains the display of choice for certain
applications. A digital readout simply cannot provide information about a
measurement's rate of change, and tracking a reading's trend is easier on an analog
meter.... [Design Idea by Kevin Bilke, Maxim Integrated Products Inc, Hook Hants, UK] |
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Multi Wire Cable Tester - A multi wire cable tester with a separate LED for
each wire. Will show open circuits, short circuits, reversals, earth faults,
continuity and all with four IC's. Designed initially for my intercom, but can be used
with alarm wiring, CAT 5 cables and more.... [Andy Collison] |
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My Method for Measuring Gig/Tera Ohm Resistors - ….(electronic
schematic added 12/08) |
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Network Lead Tester - This was designed for confirming the continuity and
correct wiring of computer network leads, but it can be adapted to check any lead with
up to 8 wires by using appropriate connectors.… [Designed by John Hewes] |
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Network Wiring Tester - Like all its counterparts, this network wiring
tester comprises two elements, a transmitter unit, powered and fitted at the network
start point, and a receiver unit, passive, which can be moved around from socket to
socket. Each of these units carries eight LEDs,….must register on this site....
[Published in Elecktor July/August 2010] |
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Noncontact Devicetests power supplies - 03/01/01 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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NPN/PNP Transistor Tester - I designed this circuit about 30 years ago and
still use it from time to time. It is powered from a 3v battery. It makes a tone when
the transistor tests good. It can be used to determine device type (NPN or PNP) and
the base, collector or emitter transistor pins. It can also test most transistors will
still connected to a circuit. …. [Hobby Corner Circuit by Dave Johnson] |
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NTSC Test Signal Generator - An accurate test signal generator for
television calibration and measurements. (added 6/06) |
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Off Line Telephone Tester - Here is a circuit of an off-line Telephone
tester which does not require any Telephone line for testing a Telephone instrument.
The circuit is so simple that it can be easily assembled even by a novice having very
little knowledge of electronics. (added 4/08) |
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Opamp Design & Test Board - Quickly assemble an opamp circuit for testing.
Very easy and intuitive to use.... |
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Optimizing Bluetooth Device Battery Drain Measurements in Manufacturing -
Agilent Application Note 1396 (added 4/08) |
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Oscilloscope helps obtain Bode plots in non 50Ω environments - 29-Mar-07
Issue of EDN Vertical amplifier isolates high-Z circuit from low-Z
network-analyzer input.... [Design Idea by Antonio Eguizabal, Freescale Semiconductor
Inc, Tempe, AZ; Edited by Charles H Small and Brad Thompson] |
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Oscilloscope testing module (huntron circuit) - ….(Circuit design added
03/08) |
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Owens Bridge Inductance Measurement Device - The circuit is a very simple
RCRCRC filtered supply and a current source. The filtered supply provides 174 bolts at
no load, and drops to 106 volts at 400mA. Ripple must be relatively low. In this
supply, ripple is about 2 mV at 400mA load, so it is sufficiently filtered. Available
voltage ranges from 154 volts at(added 8/03) |
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