Balanced Line Driver & Receiver -  Use these to eliminate hum for long signal leads __ Designed by Rod Elliott  ESP

Bipolar 20mA current-loop driver for robotic valves & other applications -  01/06/14  EDN-Design Ideas Drive bipolar current loops using a single supplyThis Design Idea drives the ±20mA current loops that are often used to control two-way proportional pneumatic or hydraulic servo valves in high power robotics applications.  Most current drivers are capable of driving unipolar outputs only.  Bipolar current drivers often require negative supply voltages.   Design by Clive Bolton

Buffer & Driver for Square-Wave Signals -  Most square-wave generators have a single output that doesn’t have a high driving capability/slew rate or is not adjustable in the required amplitude range.  Also, when conducting experiments or testing the __ Designed by Electronics Projects for You

Car Ignition Coil Driver from 12 Volts DC -  A Simple Circuit to run a Car Ignition Coil to Obtain High Voltage.  Or a 12 volt to 110 or 220 volt transformer for low power applications.   __ Designed by G.L. Chemelec

Car Ignition Coil Driver from Direct 110 VA - C -  This SCR Circuit can run a Car Ignition Coil in your home, to Obtain High Voltage.   __ Designed by G.L. Chemelec

CD ROM Drive as Digital Audio CD Player -  This circuit converts CD ROM drive in computers into a standalone audio CD player by just connecting power supply options to CD ROM and interconnecting it to either a tape deck or an audio amplifier.   __ Designed by M.P.VERMA

Ceramic Speaker Driver Also Drives Motors -  10/07/10 EDN-Design Ideas DC coupling turn the speaker driver into a motor driver.    Design by John Guy, National Semiconductor Corp, Santa Clara, CA

Character LCD Displays. Part 1 -  LCD character displays can be found in espresso machines, laser printers, children's toys and maybe even the odd toaster.  The Hitachi HD44780 controller has become an industry standard for these types of displays.  This tutorial will

Character LCD Displays. Part 2 -  This tutorial continues from Character LCD DisplaysPart 1.  In this part we will connect the LCD module to an Atmega8 microcontroller, then write some code to drive it.  The Circuit Our first task is to build the circuit.  Click to

Cheap PWM IC makes synchronous gate driver -  02/04/99 EDN-Design Ideas NOTE : Page includes several designs.  Scroll to find this one.  A system with a µP, memory, and peripherals usually requires several power-supply voltages.  Designers typically use local switching regulators to produce the desired voltage rails.  One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to some other, lower voltage.  This approach has gained vast acceptance, thanks to its relative simplicity Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Circuit Adapts Differential Input to Drive Coax -  05/08/97 EDN-Design Ideas Uses an HFA1100 or HFA1105 to convert a balanced input signal to a single-ended output signal, uses positive feedback to characteristic-impedance matching while increasing the available output swing, as compared with using a simple series termination resistor Design by Donald Whitney Jr, Harris Semiconductor, Melbourne, FL

Circuit Drives 9V Solenoids From 3V Battery -  08/17/95 EDN-Design Ideas At times, it may be necessary to power a solenoid-type pulsed actuator from a low-voltage battery in portable equipment.  The circuit in Fig 1 accomplishes this task using a standby current of 10 µA.  The design takes advantage of the fact that solenoids like being actuated by capacitive discharge at much higher levels than their nominal voltage.  This mode of operation results in a good, crisp response by the solenoid plunger.    Design by Craig Varga, Linear Technology Corp, Milpitas, CA

Circuit efficiently drives inductive loads -  05/25/00 EDN-Design Ideas In the driver circuit in Figure 1 , the system controller provIdeas the V COMMAND signal.  V COMMAND equals the desired load current multiplied by R 8 .  When the controller applies this voltage to R 1 , the output of IC 1 goes high, applying voltage to the gates of Q 1 and Q 2 .  These transistors turn on, allowing load current to flow to ground through Q 1 and R 8 Design by Carlisle Dolland, Honeywell Engines and Systems, Torrance, CA

Circuit for driving a liquid crystal (LCD) shutter to simply pass or block light -  Many of our customers request samples of a simple liquid crystal display shutter that can pass or block light.  Usually this light is in the visible spectrum, however occasionally we hear of applications where IR or UV wavelengths are involved.  If your application is for a shutter that operates outside the visible spectrum, please let us know at the time you request your sample.  __ Liquid Crystal Technologies

Circuit for Measuring Motor Speed Uses Low-Cost Components -  11/08/07  EDN-Design Ideas A microcontroller-based circuit provIdeas both an LCD readout and an analog motor-speed output Design by R Garcķa-Gil, J Castelló, and JM Espķ, Escola Tčcnica Superior d’Enginyeria, University of Valencia, Spain

Circuit forms simple, low-cost, 1-kV driver -  13-May-04 EDN-Design Ideas High-voltage drivers have recently received much attention, because they play an important role in driving piezoelectric and electro-optical components, for example.  Figure 1 shows a simple, low-cost, 1-kV driver.  The circuit uses offline, current-mode-control techniques and a flyback switching-power-supply design Design by Tai-Shan Liao and Prasit Champa, National Science Council, Hsinchu, Taiwan

Circuit Makes Universal VCSEL Driver -  10-Jul-03 EDN-Design Ideas VCSELs  (vertical-cavity surface-emitting lasers] are commercially available infrared semiconductor lasers with λ≅850 nm.  Short-cavity-length, high-quality Bragg mirrors impart properties to VCSELs that differ from those that earlier Design by Andrzej Wolczko, Institute of Electronics AGH, Krakow, Poland

Circuit provides effective LCD drive -  09/28/00 EDN-Design Ideas LCDs find wide use in portable instruments, thanks to their attractive display and low power consumption.  The circuit in Figure 1 is an effective driver for LCDs.  The circuit comprises two main sections—the ICM7211 drivers  (IC2  Design by Luo Ben Cheng, Chinese Academy of Science, Beijing, China

Circuit Smoothly Drives Stepper Motors -  05/28/09  EDN-Design Ideas Adding an analog switch make the motor bidirectionalThe circuit in This design idea     drives low-power, unipolar stepper motors using only a shift register, a few resistors, and low-power transistors.  Adding an inexpensive 4053 an Design by Uwe Schüler, Institute of Physiology, Tübingen, Germany

Circuit tests VCOM drivers -  11-Nov-04 EDN-Design Ideas Flat-panel LCD monitors offer excellent image quality andcompact form factor than CRTs—hence, their steadily increasing popularity.  Unfortunately, the complexity of their manufacturing process makes LCD monitors considerablyexpensive than CRTs.  The amplifier that drives VCOM, the voltage on the backplane of the LCD panel, must be able to drive large capacitive loads, deliver h Design by Soufiane Bendaoud, Analog Devices, San Jose, CA

Circuit Tricks Increase LCD Contrast -  04/24/97 EDN-Design Ideas A popular combination in embedded designs is the Microchip Technology PIC µC mated to one of the many available LCD modules.  These combinations provide a low-cost, simple way to add intelligence to any design.  The LCD modules are specified to operate from one 5V supply, but the lack of a negative voltage to bias the LCD backplane severely limits the available LCD contrast.    Design by Steve Hageman, Hewlett-Packard, Santa Rosa, CA

Circuits Drive Single-Coil Latching Relays -  13-Nov-08 EDN-Design Ideas Five driver circuits operate single-coil latching relays Design by Alfredo H Saab and Tina Alikahi, Maxim Integrated Products, Sunnyvale, CA

Clamped AC-Input Video Cable Driver -  This circuit shows a means of driving composite video on standard 75Ω cable with just a single 3.3 V power supply.  This is possible due to the low output saturation levels of the LT6205 and the use of input clamping to optimize the bias point of the amplifi er for standard 1VP-P source video.  The circuit provides an active__ Linear Technology/Analog Devices App Note, Mar 25th 2010

Clock with Timer & Solar Panel Regulator -  This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel.  The timer output is used to control a 12 volt load for a 32 minute time interval each day.  Start time is set using 9 dip switches and ends 32 minutes later. __ Designed by Bill Bowden

Code Provides Adjustable Differential Drive for Robots -  10/16/03  EDN-Design Ideas Intelligently modifying the motor-drive commands to a robot can give you control finesse during competitions.  Moving a joystick hard right, for example, might have different effects, depending on the robot's speed and direction.  So Design by Alton Harkcom, EGO North America, Newnan, GA

Compact Fluorescent Lamp Driver -  Operates from a 12V DC supply and can drive up to four 9W CFLs at full brightness.  Use it as part of a solar power installation or anywhere you require good lighting without mains power.__ SiliconChip

Compact Laser-Diode Driver Provides Protection for Precision-Instrument Use -  04/03/08  EDN-Design Ideas A compact, cathode-grounded laser-diode driver provIdeas protection against ESD damage, start-up spikes, overshoot, and possible fluctuation due to external optical feedback Design by Jiaqi Shen and Xiaoshu Cai, University of Shanghai for Science & Technology, Shanghai, China

Composite-VGA encoder/decoder eases display upgrade -  09/28/06 EDN-Design Ideas Upgrade an RGB video system without adding cables Design by Werner Schwiering, Joystick Scoring Ltd, Whitby, ON, Canada

Connecting AT90S2313 with LCD display 2x16 char & 4x4 keypA - D -  Connect some 2x16 characters LCD display and 4x4 keypad with AVR microcontroller __ Designed by © Vassilis Serasidis

Constant current LED driver using an NPN transistor to control an N-channel MOSFET -  Here's a really simple and inexpensive  ($1) LED driver circuit.  The circuit is a "constant current source", which means that it keeps the LED brightness constant no matter what power supply you use or surrounding environmental conditions you subject the LED's to.

Controller provides multiple alarm-driver formats -  01/15/98 EDN-Design Ideas Using a piezoelectric element for alarm applications offers low cost, low power, and flexibility.  By coupling this element with a 12C508 programmable controller (Microchip Technology, Chandler, AZ], you can implement an eight-pin alarm generator.  This approach provIdeas multiple driver formats with a minimum of additional cost and footprin Design by William Grill, Riverhead Systems, Littleton, CO

Converter Drives Fluorescent Tube -  03/31/94 EDN-Design Ideas In the last few months, several designers have published circuits for cold-cathode fluorescent-tube  (CCFT) power supplies, and a specialized power-supply IC is also now available.  However, a significant number of CCFT applications Design by Steven C Hageman, Calex Manufacturing Co, Concord, CA