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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.....(design idea added 9/08) |
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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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DCC Ammeter - The circuit shown on this page is a reasonably Low Cost, Hi-Tech
ammeter that can be used with DCC systems. The circuit's meter output is always has
the same polarity regardless of the input polarity. This allows a low cost DC
voltmeter or milliammeter to be used to monitor a DCC current....(added 04/05/06) |
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Debugging Terminal - Build a simple 9600 BAUD 8n1 LCD terminal for debugging and
testing the projects having RS232C output....(added 7/03) |
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Debugging Terminal - Easy - Build a simple 9600 BAUD 8n1 LCD terminal for
debugging and testing the projects having RS232C output....(added 7/03) |
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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 ....(electronic circuit added 10/05) |
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Defining & Testing Dynamic Parameters in High Speed ADCs, Part 1 - Maxim
Application Notes / 728 / May-05 (app note added 5/08) |
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Delay Simulator Debugs Communications Equipment - 10/27/94 EDN-Design Ideas:
Phone calls over satellite circuits experience a ¼-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.....(design idea added 3/03) |
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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 - 01/09/03 EDN-Design Ideas: 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.....(design idea added 1/05) |
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Designing and Characterizing TRL Fixture Calibration Standards For Device Modeling
11/20/01 - Application Note California Eastern Laboratories Doc #954 (app
note added 6/06) |
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Designing and Testing 3GPP W-CDMA User Equipment - Aligent Application Note
(app note added 04/05/06) |
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Designing and 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 added 6/06) |
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Designing RF Probe - make your self simple and highly useful RF probe. An
essential tool for every home brewer. . (added 9/04) |
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Dew Sensor - (electronic circuit added 10/05) |
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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 - (electronic Circuit / Schematic added 10/04) |
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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 ….(circuit design added 08/08) |
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Digital Volt and Amp Meter with Temperature Control - ….(design added 08/08) |
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Digital Volt Meter with Video Output - (electronic circuit added 09/05) |
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Digital Voltmeter - ….(electronic schematic added 08/08) |
| 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.
….(circuit design added 11/08) |
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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 gain amplifier uses divergent exponential curve - 01/08/09
EDN-Design Ideas: , 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 added 08/09) |
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Digitally programmable instrumentation amplifier offers autozeroing - 10/30/08 EDN-Design
Ideas: , Digitally programmable amplifier offers autozeroing.....(design idea
added 08/09) |
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Digitally programmable resistor serves as test load - 03/03/05 EDN-Design Ideas:
(design idea added 5/05) 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. |
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Dip Oscillator for HF - (electronic design / schematic added 2/05) |
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Distortion Analyser - A simple distortion meter you can use with an oscilloscope
or millivoltmeter (electronic schematic / circuit added 4/02) |
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DMM Measures Light Level #1 - 08/15/96 EDN-Design Ideas: (design idea added
3/03) |
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DP83815 MacPHYTER and DP83816 MacPHYTER-II High Data Rate Stress Testing -
National Semiconductor Application Note (app note added 2/06) |
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DSPbased Wireless Analyzer Targets 2.5 and 3G Networks - 02/20/03 EDN-Design
Ideas: PDF contains multiple circuits, scroll to find this circuit.....(design
idea added 8/03) |
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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 load circuit determines a battery's internal resistance - 03/31/05 EDN-Design
Ideas:.....(design idea added 5/05) |
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Dynamic Testing of High Speed ADCs, Part 2 - Maxim Application Notes / 729 /
Feb-06 (app note added 5/08) |
