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Data acquisition system captures 16-bit voltage measurements using the
USB - 05/25/06 EDN-Design Ideas....USB interface simplifies
PC-based data capture system.... EDN is migrating links. This link is
not verified. Search the "title" + "EDN" for new link.
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Data-acquisition circuit measures almost everything - 11/09/00
EDN-Design Ideas....Using a product developed for PCmotherboard
environmental monitoring, you can configure a lowcost, general-purpose
DAS (dataacquisition system) (Figure 1). The….PDF contains multiple
circuits, scroll to find the one of interest.... [Design Idea by Matt
Smith, Analog Devices, Limerick, Ireland] |
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DC
Current Indicator #4 - The circuit below uses some common
components to turn on an LED whenever DC current above a certain level
is detected. The circuit uses a very popular LM393 dual voltage
comparator from National Semiconductor and a common 1N4148 signal diode.
The diode acts as a crude 0.7v voltage reference. Only one of the
comparators inside the 8 pin package is used. A pair of resistors
across the diode forms a voltage divider, which produce a reference
voltage of about 0.015v.... [Designed by David A. Johnson] |
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DC Current Indicator 6 - The circuit below is a simple way to indicate
when DC current is flowing through a wire. The circuit is designed so it
will turn on a LED indicator light, whenever the voltage drop across a shunt
resistor exceeds about 0.1 volts. The value of the resistor can be selected
based on the desired current flow. Although I show a circuit for 12v operation,
the circuit can be used over a wide range from 3v to perhaps 24v.... [Designed by
David A. Johnson] |
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DCC Ammeter (ZXCT1009) - The circuit shown on this page allows
inexpensive digital multimeters to measure currents in DCC systems. The 2010
circuit is designed to use a 20 milliamp DC milliammeter to monitor the current
but other types of meters could also be used with this circuit. [from Rob
Paisley's Model Train web site] |
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Debugging Terminal-Easy - Build a simple 9600 BAUD 8n1 LCD terminal for
debugging and testing the projects having RS232C output.... |
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Decibel Meter - The circuit below responds to sound pressure levels from
about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a
transistor stage and one LM324 op-amp section. You can also use a dynamic
microphone but I found the speaker was more sensitive. The remaining 3 sections of
the LM324 quad op-amp are used as.... |
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Defining & Testing Dynamic Parameters in High Speed ADCs, Part 1 - Maxim
Application Notes / 728 / May-05....[App Note] |
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Delay Simulator Debugs Communications Equipment - 10/27/94 EDN-Design
Ideas.... Phone calls over satellite circuits experience a Ľ-sec transmission
delay in each direction. The low-cost circuit (around $20]in Fig 1a simulates this
delay and provides hooks for inserting noise, echo, and other impairments.
Designers debugging modems, fax machines, and other communication.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Delayed DC Power - This circuit Creates a Tiny Power Delay to a Circuit.
Read Why I designed it....(Circuit design added 12/08) |
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Delta Sigma ADC Bridge Measurement Techniques - AN96 Linear Technology AN96
features several applications that demonstrate how to take full advantage of
Linear Technology's delta sigma ADCs when interfacing to sensors. In many cases,
signal conditioning can be greatly simplified or eliminated completely. This
note explains where it is appropriate to use amplifiers and how to optimize
amplifier gain. Also included....(app note added 6/06) |
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Design makes handy audible circuit tracer - 9-Jan-03 Issue of EDN
The circuit tracer in Figure 1 is a handy tool for finding connectivity paths on a
pc board. Because the sense voltage you use to measure the path is lower than a
transistor's VBE voltage, you can use the design in circuits containing
semiconductor elements without affecting the measurement. The tracer's output
takes the form of audio tones.... [Design Idea by Jerry O'Keefe, Cupertino, CA] |
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Designing & Characterizing TRL Fixture Calibration Standards For Device Modeling
11/20/01 - Application Note California Eastern Laboratories Doc
#954....[App Note] |
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Designing & Testing 3GPP W-CDMA User Equipment - Aligent Application
Note (app note added 04/05/06) |
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Designing & Testing CDMA2000 Base Stations - Aligent Application Note
(app note added 04/05/06) |
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Designing Energy Meters with the PIC16F873A - Microchip Application Note
Published 12-Sep-05....[App Note] |
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Designing RF Probe - make your self simple and highly useful RF probe.
An essential tool for every home brewer...... |
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Detect missing pulses to avoid losing data 10-Jun-10 Issue of EDN In an
SWIR (short-wave-infrared] indium-gallium-arsenide-based imaging system, the
system must detect every trigger pulse; otherwise, lost data will result.
This Design Idea solves the problem of a data-conversion system that does not
enable an acquisition in the first of 256 trigger pulses. Figure 1 shows the SWIR
sensor, IC1. The AD-Trig signal, Pin 24, produces one pulse for each of 256
pixels. Figure 2.... [Design Idea by Chien-Hung Chen and Tai-Shan Liao, National
Applied Research Laboratories, Hsinchu, Taiwan] |
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Dew Sensor - .... |
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Digital Capacitance Meter (Elm-chan) - This is a simple capacitance
meter which can measure capacitance value easy. There are some measurement methods
for capacitance, at one time the capacitance was measured with a impedance bridge
or a dip meter….(circuit added 9/04) |
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Digital LED Ammeter - Measures current up to 10A with selected 100mA,
10mA and 1mA resolutions. (circuit added 8/06) |
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Digital LED Voltmeter - Measures voltages up to 199.9V with 0.1V
resolution. (circuit added 8/06) |
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Digital Mains Voltage Indicator - .... |
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Digital Radar Speedometer - This circuit is a Digital Radar Speedometer.
It allows us to evaluate the speed of any object moving, especially cars and other
vehicles. The speed is calculated in kilometers per hour (KPH). Its display has
three digits. This radar works with the laser reflexion. It sends laser
radiation to the object and this object reflects the laser radiation …. [Site is
under construction right now] |
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Digital Volt & Amp Meter with Temperature Control - This project was
designed and constructed as enhancement to the 0-30V Stabilized Power Supply
Project with the DIY electronics hobbyist in mind. The circuit uses a single PIC
Microchip to perform the Voltage, Current and Temperature conversions and display
functions. The PCB Board uses large ….... |
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Digital voltmeter - Schematic only, no circuit description |
| Digital volume control (Aaron Cake) -
based on DS1669 Digital Pot IC (added 5/02) |
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Digital Wattmeter - The extra input B is for a later SWR brigde project,
also the TX serial output will be in use later. The uncalibrated signal response
is: +1/-1 dB from 1MHz to 450MHz. Input SWR vill varry from 1.00 to 1.30,
depending on input frequency. To make the SWR this good, you need to assemble the
input circuit correct and adjust the capasitor. Input power range: -60 to +30dBm
that is 1 nW to 1 Watt. ….... |
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Digital/Standard Phone Line Tester - make sure that the line is suitable
for modem use and your PCMCIA does not damage if you plug it in ASCII format
(added 5/02) |
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Digitally programmable instrumentation Amplifier offers autozeroing -
10/30/08 EDN-Design Ideas....The current trend in advanced instrumentation amps is
to use no external resistors. In these amplifiers, a gain-control word, comprising
a binary-coded one, sets the voltage gain. Several integer gains within one to
1000 are currently available; however, this range does not.... [Design Idea by
Marián Štofka, Slovak University of Technology, Bratislava, Slovakia] |
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Digitally programmable resistor serves as test load - 3-Mar-05 Issue of
EDN Figure 1 illustrates a digitally programmable precision resistance that
can serve as a microprocessor-driven power-supply load in custom-designed ATE
(automatic-test equipment]. An 8-bit current-output DAC, IC1, a DAC08, drives
current-to-voltage converter IC2A, which in turn drives the gate of power MOSFET
Q1.... [Design Idea by Francesc Casanellas, Aiguafreda, Spain] |
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Digitally programmable-gain amplifier uses divergent exponential curve -
8-Jan-09 Issue of EDN The divergent-exponential and negative time constants
are the core concepts of the DENT
(differential-divergent-exponential-negative-time-constant] digitally
programmable-gain-amplifier topology.... [Design Idea by W Stephen Woodward,
Chapel Hill, NC] |
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Dip Oscillator for HF - amateur radio construction projects…. [from
Peter Parker's website] |
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Distortion Analyser - A simple distortion meter you can use with an
oscilloscope or millivoltmeter.... |
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DMM Measures Light Level - 08/15/96 EDN-Design Ideas....The circuit in
Figure 1 allows you to measure light using a regular digital voltmeter. The
TSL230B (IC1] is a programmable light-to-frequency converter whose output
frequency is proportional to the light level. Inputs S0 and S1 set the sensitivity
of IC1 to 1X, 10X, or 100X. S2 and S3 control the internal programmable....
[Design Idea by Yongping Xia, EBT Inc, Torrance, CA] |
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DP83815 MacPHYTER & DP83816 MacPHYTER-II High Data Rate Stress Testing -
National Semiconductor Application Note (app note added 2/06) |
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DSP Algorithm Measures Frequency & Damping - 10/08/98 EDN-Design
Ideas....The time-domain DSP algorithm described here allows you to measure the
key parameters—natural frequency and damping—in linear, second-order
electromechanical systems. The method applies to a range of electromechanical
transducers (electromagnetic or electrostatic], including dynamic speakers,
seismic geophones, micromachined sensors, and other systems....Contains several
designs, scroll to find this one. [Design Idea by Olga Belousova, Los
Alamos, NM, and Alexander Belousov, New York, NY] |
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DTMF RECEIVER - Today, most telephone equipment use a DTMF receiver IC.
One common DTMF receiver IC is the Motorola MT8870 that is widely used in
electronic communications circuits. The MT8870 is an 18-pin IC. It is used in
telephones and a variety of other applications. When a proper output is not
obtained in projects using this IC, engineers or technicians need to test this IC
separately. A quick testing of this IC could save a lot of time in research labs
and manufacturing industries of communication instruments. Here’s a small and
handy tester circuit for the DTMF IC. ….(design added 11/08) |
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Dual HI/LO Switched Relay Board - (design idea circuit added 09/08)
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Dynamic Testing of High Speed ADCs, Part 2 - Maxim Application Notes /
729 / Feb-06....[App Note] |
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Dynamic-load circuit determines a battery's internal resistance -
31-Mar-05 Issue of EDN Meet the challenge of measuring a battery's internal
parameters with a nonstatic load approach.... [Design Idea by Jim Williams, Linear
Technology Corp, Milpitas, CA; Edited by Brad Thompson] |
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