Easy Drive™ ADCs Simplify Measurement of High Impedance Sensors  -  DN379 Design Notes (Linear Technology) . . .  [Linear Technology]

Economical circuit drives white LEDs  -  11/23/00 EDN Design Idea   Newly available white LEDs are replacing CCFLs (cold-cathode fluorescent lamps] in handheld applications using a back-lit LCD. These applications include PDAs (personal digital assistants], digital cameras, and cellular telephones,. . .  [by Eddy Wells, Texas Instruments]

EDE1200-UNIPOLAR Stepper Motor Driver (PCB)   -  Miscellaneous circuit for model trains. . .  [Designed by Rob Paisley]

Efficient unipolar stepper motor driver (only uses power when it makes a step)  -  This circuit is based on the UNIPOLAR stepper motor. The main feature of this circuit is low power consumption in the motor circuit. This is achieved by only turning on the individual outputs of the driver for 1/10th of a second for each step the motor makes. . .  [from Rob Paisley's Model Train web site]

Embedded Processor Directly Drives LCD  -  01/09/03    EDN Design Idea   Driving a bare LCD does not necessarily require specialized interface circuitry or peripherals. This Design Idea  describes an alternative drive scheme, which you can easily implement using the general-purpose outputs of a microcontroller. . .  [by Daniel Malik, Motorola, Czech Republic]

Extending Battery Life with the TPS61040 White Light LED Driver  -  TI Application Note. . .   

Failsafe multichip LED module driver  -  05/12/14 EDN Design Idea   Keep a power LED module with multiple strings operating despite fault conditions. The operational life of an LED depends upon how effectively the current flowing through it is kept within the specified limits under all possible working conditions. For multi-chip LED modules, the tightly binned LEDs are arranged in strings having multiple LEDs connected in series, parallel, or series-parallel configurations, sharing a common constant current or voltage source, and each LED string is typically driven at a regulated current that is substantially equal among all of the LED strings. Although a small imbalance in string currents does not cause noticeable differences in brightness, parameters like the compound forward voltage (sum of VF of all LEDs connected in series), and its critical dependence on temperature and magnitude of forward current (IF) flowing through it,. . .  [by Subodh Johri]

Fast precision LED driver  -  The circuit allows a precision regulated drive current to be set to drive an LED, and in response to a TTL level signal, the LED is switched on and off with rise and fall times of less than 500 nanoseconds and less than 7% overshoot. This was designed for biological experiments to study the photo repsonse of cone cells rabbit eyes. . .  [From Dick Cappels' project pages]

Feedback Circuit Eliminates CCD-Driver Delay Mismatch  -  09/18/03  EDN Design Idea   In a CCD (charge-coupled device], packets of charges shift across the array. The transistor array, also called a bucket-brigade shift register, receives drive from a dual-phase clock signal. Dual-phase clock signals comprise two. . .  [by Mike Wong, Intersil-Elantec, Milpitas, CA]

Flashing LED Advertising Badge #1  -  I have seen numerous flashing light badges at trade shows and conventions. They are often handed out as gifts to promote some business. The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/26/02]

Flashing LED Power Indicator  -  This circuit flashes a power indicator LED to keep the average current low . . . [Circuit by David A. Johnson P.E.,  06/04/00]

Flashing Light to simulate Car Alarm  -  Whenever the car’s ignition is turned off, this circuit activates a flashing LED, which can be positioned to appear as an active alarm system . . . [Hobby Circuit designed by David A. Johnson P.E.,  10/16/05]

Flexible Outputs from Square Wave Driver  -  This circuit can produce an output signal ranging from DC to 100KHz. It can source a voltage ranging from 1v to 30v. It can sink a voltage ranging from zero volts to –30v. It can drive up to 200ma of current and can even be switched to a floating tristate . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/08/00]

Flyback Transformer Driver  -  This is an efficient flyback driver for modern cylindrical rectified television flybacks. Many sites doesn't provide circuits driving these transformers, they simply say that they are bad.
. . . .  [by IQ Technologies Industry, unless otherwise noted online]

Flyback Transformer Driver  -  This is by far the best project for someone who is already familiar with High Voltage, but wants to take their experiments to the next level: It requires very little previous experience and skills with soldering and identifying components, and there are virtually no adjustments to be made. The danger is minimal, as fly back transformers are intrinsically low power devices, not capable of outputting lethal currents (due to the hair-thin secondary windings) , and. . .   

Flying inductor LED series voltage boost circuit  -  A circuit that goes in series with a white LED and a 1.5volt cell to make > 3 Volts to drive a white LED. . .  [From Dick Cappels' project pages]

Form Push-Pull Driver using N-Ch And P-Ch Transistors   -  This circuit can produce high speed output signals with fast rise and full times. The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts. The output current is only limited by the rating of . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/27/00]

Four DIPs provide as many as 80 sequential-LED outputs  -  08/21/08  EDN Design Idea   A simple circuit uses HCMOS parts and adds one 74HC540 to multiplex the outputs of two 4017 counters for as many as 80 outputs. . .  [by Greg Carkner, Cobourg, ON, Canada]

Four Output (-6.5V AT 500uA, 20V AT 500uA, 10V AT 2mA, 5 LED) Supply for Color LCD Displays  -  From a 2. 7V to 4. 2V input, the LT1944 can generate 3 required bias voltages (-6. 5V AT 500uA, 20V AT 500uA, 10V AT 2mA) and drive a string of 5 white LEDs for backlighting . . .  [Linear Technology App Note - , Mar 24, 2010]

Frequency source feeds entire lab  -  01/23/03    EDN Design Idea   Plumbing a laboratory with a standard frequency makes a lot of sense if the lab uses multiple frequency counters, spectrum analyzers, and other frequency-dependent test equipment. Rather than spending time keeping all of the. . .  [by Mitchell Lee, Linear Technology Corp, Milpitas, CA]

Full Bridge Transistor Motor Driver  -  a nifty little circuit that monitors the battery voltage as it gets charged. . .  [by P. Townshend - EduTek Ltd]

Full Bridge Mosfet Motor Driver  -  an ingenious design that prevents shoot through, ideal for PWM/robotics / radio control. . .  [by P. Townshend - EduTek Ltd]

Generate 0.5v Negative Supply  -  A while back someone needed a simple way to generate a negative 0. 5v supply from a conventional transformer type AC to DC power supply. The circuit below uses a couple schottky diodes and a filter capacitor to perform the feat . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/10/11]

Generating a ±10.24V true bipolar input for an 18-Bit, 1Msps SAR ADC  -  01/27/15  EDN Design Idea   This fast, hi-res, differential-input ADC is easily driven. . . .  [EDN Design Idea]

Glowplug Driver for Radio Control  -  An on/off switch is not required for the glowplug driver since it only draws current when a glowplug is attached. As a matter of fact, the circuit is only powered (via Q1) via a connected glowplug. Just in case you were wondering how the positive (+) side of the circuit is connected. The starter motor runs directly from the flight box battery, via the jacks on the power-panel, and has it's own on/off switch. Same scenario for the fuel pump, but includes a reverse switch to pump the fuel in or out the tank/cannister. . .  [Tony van Roon's circuit]

Glowplug Panel  -  of Glowplug panel. . . .  [Tony van Roon's circuit]

Grade Crossing Bell Ringer Circuit  -  This circuit is a driver for a mechanical - Grade Crossing Bell Ringer - that was originally built for the London Model Railroad Group. . . .  [from Rob Paisley's Model Train web site]

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