Dallas DS1620 Based USB Digital Thermometer:  (Electronic circuit added 4/05)

Decoding the HCS101 for Non-Secure Applications:  Microchip Application Note - Published 29-Jul-04   (added 2/06)

Design Considerations for a Ku-Band DRO in Digital Communication System (5/99) :  Application Note - California Eastern Laboratories - Doc #928  (Circuit / schematic design added 6/06)

Design Guidelines for Off-line Forward Converters using FPS / AN-4134:  Fairchild Application Notes / (Circuit / schematic design added 6/06)

Design of Power Factor Correction Circuit Using FAN7527B / AN-4121:  Fairchild Application Notes / (Circuit / schematic design added 6/06)

Designing a Digital Compass using the PIC18f2520:  Microchip Application Note - Published 8-Aug-05   (added 2/06)

Designing an Fcc Approved Ask Rfpic™ Transmitter:  Microchip Application Note - Published 2-Jan-03   (added 2/06)

Designing Energy Meters with the PIC16F873a:  Microchip Application Note - Published 12-Sep-05   (added 2/06)

Designing Low Noise Amplifiers for PCS Applications (8/25/97) :  Application Note - California Eastern Laboratories - Doc #923  (Circuit / schematic design added 6/06)

Devicenet™ Group 2 Slave Firmware for PIC18 with Can:  Microchip Application Note - Published 6-Oct-03   (added 2/06)

Difference Amplifier uses Digital Potentiometers:  05/30/02 EDN Design Ideas  /  (added 1/05)  You sometimes need to measure a small signal in the presence of a large common-mode signal. Traditional instrumentation amplifiers that use two or three op amps in their internal structure find common use in these applications. The circuit in Figure 1 presents an alternative approach that is useful when low cost and low drift are important, but when you don't need high precision....

Digital Call Sign Annunciator:  (Electronic circuit added 4/05)

Digital Camera Interface:  (PDF) project shows how a CMOS ‘Camera On a Chip’ image sensor can be interfaced to an XSA-100 Board through an I2C bus. The pixel data is buffered in the XSA-100 SDRAM and is then uploaded through the parallel port to be displayed on a PC. (Electronic Schematic / circuit added 4/02)

Digital Camera Subs as a Scope Camera:  12/09/99 EDN Design Ideas /  (Schematic / circuit added 10/05)

Digital Coding Schemes for Mixed Signal Communication:  Microchip Application Note - Published 18-Jul-01   (added 2/06)

Digital Combination Lock:  (added 9/02)

Digital Current Source is Nonvolatile:  02/07/02 EDN Design Ideas  /  (added 1/05)  Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers. The circuit in Figure 1, for example, is particularly suited for setting the drive current for the optical pump in widely tunable VCSELs (vertical-cavity surface-emitting lasers). ...

Digital Delay Unit for Surround Sound:  (added 9/02)

Digital Dimming DALI Ballast for 32w/T8 110V Input:  This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI).  (circuit design added 3/05)

Digital Dimming DALI Ballast for 36w/T8 220V Input:  This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI).  (circuit design added 3/05)

Digital Engine/Race Computer Board:  The objective of this project is to design a high speed digital engine tachometer. This requires the design and development of a hardware and software solution to monitor the status of an engine in real time. In addition, information relating to the overall health and systems of the vehicle can be displayed.  (Schematic / circuit added 10/05)

Digital Filter Makes Simple SPICE Eliminator:  04/10/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03))  

Digital Noise Reduction Techniques for Combo Ii:  National Semiconductor - Application Note   (added 2/06)

Digital PC Oscilloscope:  (circuit added 7/02)

Digital Pedometer Circuit:  (Electronic circuit added 4/05)

Digital Position Encoder Does Away withADC:  05/08/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03))  

Digital Pot Adjusts Lcd's Contrast:  02/04/99 EDN-Design Ideas  / (added 5/03)   You can use a digitally controlled potentiometer for many purposes. In this example, you can use the device to regulate the contrast of a standard (such as two lines by 40 characters) LCD. You can use the circuit in Figure 1 in a portable test system, in which you need to change the contrast of the LCD as a function of the viewing angle. You choose the contrast setup from a menu and then use up or down buttons with µC IC1 to adjust the contrast. The µC stores the contrast value in the digital potentiometer, IC2. This design uses a Xicor 10-k unit (dubbed "EEPOT"), but you could use other devices in the design.  The EEPOT connects to the LCD's VO line. You could connect....

Digital Pot Corrects for System Drift:  11/10/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03))  The circuit in Fig 1 looks simple but usually comes as a revelation to designers. Under control of the system's µP, the digital potentiometer, IC1, becomes a variable set-point reference that can adapt to the long-term drift of the variable measured. The digital potentiometer replaces schemes involving A/D and D/A converters (see "Autocalibrator nulls dc offsets," EDN, June 9, 1994, pg 139, and "Infinite-hold circuit zeros out long-term drift," EDN, March 3, 1994, pg 90)....  

Digital Potentiometer Autonulls Opamp:  10/22/98 EDN-Design Ideas / (Electronic Circuit diagram added 03/03))  

Digital Potentiometer Controls LCD Bias:  03/17/94 EDN-Design Ideas / (added 03/03) Designers of pen-based computers can easily relegate some controls that were previously mechanical, such as switches and potentiometers, to on-screen icons. For example, the circuit in Fig 1 shows one way that digital logic can control the -24V-dc LCD bias using two general-purpose I/O command lines. The DS-1669 from Dallas Semiconductor is a 64-step potentiometer available in 10-, 50-, and 100-kV ranges. The up-count (UC) and down-count (DC) pins digitally control the wiper of the potentiometer. A low-going pulse to either of these pins increases or decreases, respectively, the wiper's position on the pot relative to RL. This change in position adjusts the base current in Q1, whose collector connects to the adjust pin on an LM337 negative voltage regulator. By changing the amount of current injected into the LM337's adjust pin, the circuitry simulates having another resistor in parallel with R1, and the voltage output at VOUT changes accordingly. Tapping a pen on icons that represent contrast-or other computer functions, including brightness, LCD/CRT and suspend resume-controls the I/O pins.....

Digital Potentiometer Controls Phase Shift:  02/15/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03))  

Digital Potentiometer Programs and Stabilizes Voltage Reference:  05/30/02  EDN - Design Ideas / (added 11/03)    The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its digital controls provide programmability. You can use a digital potentiometer in two ways in an analog circuit. You can use it as a two-terminal variable resistance, or rheostat, or as a three-terminal resistive divider..

Digital Potentiometers Enable Programmable Biquadratic Filter:  07/22/04 EDN Design Ideas  / (Schematic / circuit added 10/05)  Of the many types of analog filters available to designers, few allow easy adjustments of the filter parameters. The biquadratic, or biquad, filter is an exception, however. You can change that filter's corner frequency (ω0), Q, and gain (H) by adjusting the values of three resistors. For that purpose, the lowpass biquad circuit of Figure 1 includes three digital potentiometers configure...

Digital Remote Thermometer:  Remote sensor sends data via mains supply Temperature range:00.0 to 99.9 °C (Circuit added 9/04)

Digital Resolver Integration:  AN-234 - Analog Devices Application Notes  (added 2/06)

Digital Signal Controls Sine Generator:  05/15/03 EDN Design Ideas  /  (added 1/05)  The circuit of Figure 1 produces an accurate, variable-frequency sine wave for use as a general-purpose reference signal. It includes an eighth-order elliptic, switched-capacitor lowpass filter, IC3, which uses a 100-kHz square-wave clock signal that microcontroller IC2 generates. (Any other convenient square-wave source is also acceptable....

Digital Signal Processing with the PIC16C74:  Microchip Application Note - Published 26-Aug-97   (added 2/06)

Digital Signal Processor (DSP) for Radio Communications:  (Electronic circuit added 7/03)

Digital Signals Decoding Interfaces:  (Electronic circuit added 4/05)

Digital Signals Produce Pure Sine Waves:  10/09/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03))  

Digital Step Km Counter Max.:  Pedometer has a range of 9.950 meters with2-digits. Slip it in pants pocket for walking and jogging (Circuit added 9/04)

Digital Stereo Potentiometer:  in PDF format, text in Finnish (Electronic Schematic / circuit added 4/02)

Digital Stopwatch 0-60sec:  (Electronic circuit added 4/05)

Digital Stopwatch 0-99sec:  (Electronic circuit added 4/05)

Digital Sync Tip Clamping:  10/08/98 EDN-Design Idea / (Electronic Circuit diagram added 03/03))   -- Digital sync-tip Clamping allows an ac-coupled ADC to digitize analog video without restoring the horizontal Timing. A new approach to video signal conditioning.

Digital Tachometer Avoids Analog Vices:  11/10/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)) The digital tachometer in Fig 1a is a component of the digital seek servo loop in Fig 1b. The loop produces an error signal that causes a motor to follow a sophisticated velocity profile (Fig 2). Although you could use an analog tachometer, the digital one costs less, performs better, is less sensitive to temperature, and implements easier in a custom IC....   

Digital Timer has Independent on/Off Periods:  03/28/96 EDN-Design Ideas / (added 03/03)  

Digital Video Processor:  (Electronic circuit added 7/03)

Digital Volt Meter:  (Circuit / schematic design added 6/06)

Digital Voltmeter #2:  This is just a schematic view of a digital voltmeter all components and values are listed. (Circuit / schematic design added 6/06)

Digital Voltmeter:  (Circuit added 9/04)

Digital Volume Control has Log Taper:  04/11/02 EDN Design Ideas  /  (added 1/05)  Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw: a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper. ...

Digital Volume Control:  based on DS1669 Digital Pot IC (Electronic circuit added 5/02)

Digital Water Wave/Tide/Level Meter (PIC16F876):  (added 6/03)

Digitally Addressable DALI Dimming Ballast:  (Electronic circuit added 4/05)

Digitally Control Gain over a ±40 Db Range:  09/12/97 EDN-Design Ideas / (Electronic Schematic / circuit added 4/02)   -- digitally control an amplifiers gain over a ±40-dB range gain Resolution of1.25 dB

Digitally Control Room Light Intensity:  11/11/04 EDN Design Ideas  / (added 5/05)  Many people favor different light and temperature settings for different rooms depending upon their mood or whether they are working or relaxing. The circuit in Figure 1 controls the intensity of the artificial light in a room and monitors the temperature of two zones. The two main circuit blocks are the PIC16C67 master controller and the ADT7516 temperature-sensor interface, which includes a ...

Digitally Programmable Resistor Serves as Test Load:  03/03/05 EDN Design Ideas  / (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.

Digital-Simulation Logic-Value Systems:  02/03/97 EDN-Design Feature / (added 2/06)    In addition to representing logical values, simulators need to represent the strengths of those values. The problem lies in how a simulator can accomplish this task. —Clive "Max" Maxfield, Intergraph Electronics

Dinsmore 1490 Digital Compass:  (Circuit / schematic design added 6/06)

Direct Digital Synthesis (DDS):  A tutorial giving information about the basics of direct digital synthesis and synthesizers with phase generator, accumulator, digital to analogue converter, and mentioning the alias problem that can occur. (Electronic Circuit added 03/06)

Downloading Hex Files to External Flash Memory using PIC17cxxx Picmicro ® Microcontrollers:  Microchip Application Note - Published 6-Nov-98   (added 2/06)

DRCS: CLC5526/CLC5956/CLC5902 Diversity Receiver Chipset:  National Semiconductor - Application Note   (added 2/06)

DS1821 Programmable Thermostat:  (Electronic circuit added 4/05)

DS92lv16 Power Up Reset:  National Semiconductor - Application Note   (added 2/06)

Dual Polarity Amplifier has Digital Control:  09/12/96 EDN-Design Ideas / (Circuit / schematic design added 6/06)  

Dynamic Characteristics of Tracking Converter:  AN-264 - Analog Devices Application Notes  (added 2/06)