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Last Updated: December 01, 2017 03:41 AM


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Dual Battery Load Sharing with Automatic Switchover to a Wall Adapter -  An application circuit for dual battery load sharing with automatic switchover of load from batteries to a wall adapter is shown in this circuit.  When the wall adapter is not present, whichever battery that has the higher voltage provides the load current until it has discharged to the voltage of the other battery.  The load__ Linear Technology/Analog Devices App Note, Jul 8th 2011

DUAL- COLOUR STROBOSCOPE -  Stroboscope is a device used to make a cyclically moving object appear slow-moving or stationary.  This is realised by illuminating the object intermittently with short pulses of light.  Stroboscope is used in the study of insect flight.  It can also be used for experiments with simple pendulum, studying details of rapidly moving objects and strobo-animation.__ Designed by Raju Baddi

Dual Comparator -  forms temperature-compensated proximity Detector __ Maxim Integrated

Dual controller provides 2μs step response & 92% efficiency for 1.5V rails -  12/29/13  EDN-Design Notes   Use a heated diode as a flow sensor.   The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency, and low duty cycle capability.  The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized to an external clock.  The LTC3838 accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs. __ Circuit Design by Mike Shriver

Dual DC Motor speed control with reverse -  I built this way back in 2000 to power a remote control "tank" I built in high school.  Circuit schematic, source code, and pictures of the project are all shown.   __ Contact: Paul Wilkins

Dual DC Motor Speed Controllers Navigate Robots -  03/29/01 EDN-Design Ideas Mobile robots need simple and lightweight dc-motor-speed-control hardware that can work with low-power batteries.  Flip-flop type navigation systems allow only one motor to operate at a time while the other motor remains off.  Navigation direction changes __ Circuit Design by Shyam Sunder Tiwari, Robotics Software Pvt Ltd, Gwalior, India

Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing & ±50mA VTT Reference -  11/01/13  EDN-Design Notes   Solid-state circuit breaker for microcontrollers.  The LTC3876 is a complete DDR power solution, compatible with DDR1, DDR2, DDR3, and DDR4 lower voltage standards.  The IC includes VDDQ and VTT DC/ DC controllers and a precision linear VTT reference.  A differential output sense amplifier and precision internal reference combine to offer an accurate VDDQ supply.  The VTT controller tracks the precision VTTR linear reference with less than 20mV total error.  The precision VTTR reference maintains 1.2% regulation accuracy, tracking one-half VDDQ over temperature for a ±50mA reference load.   __ Circuit Design by Ding Li

Dual Fan Controller -  A birthday present gone too far.  An overengineered temperature-based automatic twin fan controller with brass face to keep a kitchen PC cool.    __ Contact: David Cook

Dual LED Flasher -  Some useful circuits using the LM555 IC.  Scroll to find the Dual Led Flasher circuit __ Designed by Jose Pino

Dual Motor Control for Robots -  Presented here is a simple circuit that can drive two motors for a small robot, allowing the robot to negotiate an obstacle course.  Two light-dependent resistors (LDRs) are used to detect...__ Electronics Projects for You

Dual Polarity Amplifier has Digital Control -  09/12/96 EDN-Design Ideas The circuit in Figure 1 can amplify a signal either in an inverting or a noninverting mode.  When switch S1 is on and S2 is off, the circuit behaves as a regular inverting amplifier.  When S2 is on and S1 is off, the circuit feeds the signal to the noninverting input of the op amp; thus, the circuit behaves as a noninverting amplifier.  If S1 and S2 are monolithic analog switches, you __ Circuit Design by Rick Downs, Dallas Semiconductor Corp, Dallas, TX

Dual Relay Driver Board -  A simple and convenient way to interface 2 relays for switching application in your project.  This relay driver boosts the input impedance with a regular BC547 NPN transistor (or equivalent).  Very common driver.  It can drive a variety of relays, including a reed-relay.  Transistor Q1and Q2 are a simple common-emitter amplifier that increases the effective sensitivity of the 12 volt relay coil about a 100 times, or in other words, the current gain for this circuit is 100__ Learning Electronics

Dual Slope-Sampling Solar Engine -  If you had time to experiment with the ALF type SE circuit you may have discovered some of its shortcomings with regard to a Power Smart Head adaptation. The problem is that HCMOS gates are power hungry when used as SE voltage comparators when the analog input voltage is near the CMOS switching threshold. If an HCMOS gate is used without sampling, the chip supply current can be as high as 70mA with the comparator input voltage near the trigger threshold (Vcc / 2). __ Designed by Wilf Rigter

Dual Stepper Motor Driver for a Robot Differential Drive -  This article describes the hardware and the software used to control two stepper motors suitable for a robot differential drive.  The circuit accepts two 2-bit words that command each of the motors to go forward, backward, hold a position, or to idle.  It also provides an output signal when a step is being taken.  It is a flexible design allowing for unipolar and bipolar motors __ Designed by J. L.  John Girard

Dual stepper Motor drivers using UDN2540 -  The UDN2540B is a quad darlington power driver, manufactured by Allegro.  Each output can sink up to 1.8A continuous.  The typical applications include print heads, relays, solenoids, and stepper motor control.  It is a replacement for L6221A.  In this Dual stepper motor drivers design we use two UDN2540B to drive two stepping motors at the same speed.  Each motor can be independently controlled.  The S1, S2 switches control the ON/OFF and the moving direction of Motor1.  The S3, S4 control the Motor2, respectively __ Contact: info @ wzmicro.com

Dual Tandem Flashing Light-Powered by a 9 Volt Battery -  This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure.    (Personally, I can't recommend you buy anything but the Rollins Railroad Designs kit; for $4.00 you can't go wrong.  The 555 IC is about $1.50 by itself at Radio Shack).  If you choose to buy all the parts yourself, realize you need ONLY two LEDs, not two of each; you should be able to mix and match colors.   __ Designed by ML Rollins

Dummy Alarm -  This project makes a superbright LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm.  The circuit is designed to use very little current to prolong battery life so that it can be left on permanently.  This is a simple project, ideal for a beginner __ Designed by John Hewes

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