|
Machine Vibration Activates Hour Meter - 01/16/97 EDN-Design Ideas: by David
Johnson 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....(added 09/05) |
|
Magnetic field probe requires few components - 12/15/06 EDN-Design Ideas:
(design idea added 05/06/07) Hall-effect sensor and DMM explore stray
fields. |
|
Magnetometer - (schematic added 8/03) |
|
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.....(electronic Circuit / Schematic added 10/04) |
|
Make a Low Cost Benchtop Power Meter - 09/11/98 EDN-Design Ideas: (design
idea added 6/06) |
|
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 electronic design added 2/06) |
|
Making Differential Probes - For sensing audio signal voltages across devices that
are not ground referenced (added 6/03) |
|
MAR/RAM Test Fixture Instructions - Application Note MiniCircuits.com AN-60-018
(app note added 04/05/06) |
|
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) |
|
MAV Test Fixture Instructions - Application Note MiniCircuits.com (app note
added 04/05/06) |
|
MAX6953 Development board - ….(electronic schematic added 08/08) |
|
Measure humidity and temperature on one TTL line - 08/30/01 EDN-Design Ideas:
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 added 1/05) |
|
Measure Inductance with DC Superimposed - 07/06/95 EDN-Design Ideas:.....(design
idea added 3/03) |
|
Measure nanoamps to ensure accurate computer clocks - (Video Design Ideas- EDN,
5/10/07 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) |
|
Measure open circuited cables using a multimeter - 09/26/02 EDN-Design Ideas:
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 added 1/05) |
|
Measure power line distortion with a mixed signal THD analyzer - 11/22/07 EDN-Design
Ideas: A mixed-signal total-harmonic-distortion-analyzer device measures the
distortion of the mains ac voltage.....(design idea added 9/08) |
|
Measurement methods - Application Note MiniCircuits.com (app note added
04/05/06) |
|
Measuring Input and 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) |
|
Measuring Jitter in Digital Systems AN 1448-1 - Agilent Application Note
(added 6/06) |
|
Measuring RF Voltages with a VOM - (schematic added 8/03) |
|
Measuring self resonant frequency - Coilcraft RF Magnetics Application Notes
-(added 6/06) |
|
Measuring sensitivity of transponder coils - Coilcraft RF Magnetics Application
Notes -(added 6/06) |
|
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) |
|
Mercury Battery Replacement - There are many older battery-powered instruments on
the surplus market that require mercury batteries but these batteries have been banned
for environmental reasons. Simply substituting another battery type may give
unsatisfactory…(circuit added 04/05/06) |
|
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....(added 05/08) |
|
Method simplifies testing high Q devices - 02/21/02 EDN-Design Ideas: 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.....(design idea added
1/05) |
|
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 added 1/05) |
|
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) |
|
MicroController functions as voltmeter - 05/10/07 EDN-Design Ideas: PIC
microcontroller and FETs enable a four-digit voltmeter.....(design idea added 9/08) |
|
MicroController simplifies battery state of charge measurement - 04/26/07 EDN-Design
Ideas: (design idea added 04/07) |
|
Microphone Polarity Tester - (electronic schematic / circuit added 4/02) |
|
MIDI interface/cable tester - (circuit / schematic added 6/05) |
|
MIDITester - (circuit / schematic design added 6/06) |
|
Millen 90501 Secondary frequency standard schematic - ....(electronic circuit
added 07/07/07) |
|
Millen 90651 Grid-dip meter manual w/schematic - (circuit added 07/07/07) |
|
Millen 90651A grid-dip meter schematic - ....(electronic circuit added 07/07/07) |
|
Millen 90652 solid-state dipper schematic - ....(electronic circuit added
07/07/07) |
|
Millen 90662A grid-dip meter schematic - ....(electronic circuit added 07/07/07) |
|
Millen 90903 oscilloscope (new version) schematic - ....(electronic circuit added
07/07/07) |
|
Millen 90903 oscilloscope (old version) schematic - ....(electronic circuit added
07/07/07) |
|
Millen 90912 instrumentation oscilloscope schematic - ....(electronic circuit
added 07/07/07) |
|
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) |
|
Mini DDS direct Digital Synthesizer - (schematic added 8/03) |
|
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.....(design idea added 6/06) |
|
Mixed Signal Testing using the IEEE 1149.4 STA400 - National Semiconductor
Application Note (app note added 2/06) |
|
Modified Scope Probe Tests Surface Mount Assemblies - 09/25/97 EDN-Design Ideas:
(design idea added 3/03) |
|
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. ….(designed
by David A. Johnson) |
|
Monitoring Additional Supplies with the ADM1062-ADM1069 Super Sequencers™ - AN-781
Analog Devices Application Note (app note added 6/06) |
|
Monitoring High Voltages with the ADM1062-ADM1069 Super Sequencers™ - AN-782
Analog Devices Application Note (app note added 6/06) |
|
Monitoring Negative Voltages with the ADM1062-ADM1069 Super Sequencers™ - AN-780
Analog Devices Application Note (app note added 6/06) |
|
Morse Monitor - (circuit / schematic design added 6/06) |
|
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 electronic design
added 6/06) |
|
Moving coil meter measures low level currents - 03/03/05 EDN-Design Ideas:
(design idea added 5/05) 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. |
|
MPU temperature meter - Multi point temperature meter which displays tempertures
to an LED display with time divided. This is good for monitoring temperature of PC
components. (added 6/06) |
|
MPU temperature meter #3 - Multi point diode temperature meter to replace
thermister temperture meter. This is for diode temperture sensors icludes on-die
thermal diode of micro-processor. (added 6/06) |
|
Multi Wire Cable Tester - (electronic schematic / circuit added 4/02) |
|
My Method for Measuring Gig/Tera Ohm Resistors - ….(electronic schematic added
12/08) |
|
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 (circuit added
06/07/08) |
|
Nida Minilab 400 multi-purpose trainer information page - (added 07/07/07) |
|
Noncontact Devicetests power supplies - 03/01/01 EDN-Design Ideas: (design
idea added 2/06) |
|
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. ….(designed by David A. Johnson) |
|
NTSC Test Signal Generator - An accurate test signal generator for television
calibration and measurements. (added 6/06) |
|
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) |
|
Opamp Design and Test Board - Quickly assemble an opamp circuit for testing.
Very easy and intuitive to use (electronic schematic / circuit added 4/02) |
|
Optimizing Bluetooth Device Battery Drain Measurements in Manufacturing - Agilent
Application Note 1396 (added 4/08) |
|
Oscilloscope helps obtain Bode plots in non 50Ω environments - 03/29/07 EDN-Design
Ideas: Vertical amplifier isolates high-Z circuit from low-Z network-analyzer
input.....(design idea added 9/08) |
|
Oscilloscope testing module (huntron circuit) - ….(circuit design added 03/08) |
|
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) |
