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Techniques for 92% Efficient LCD Illumination -  Linear Technology AN55 __ Designed by Jim WilliamsAug 1st, 1993

Techniques for 92% Efficient LCD Illumination -  AN55 Linear Technology This publication details several LCD backlight circuits which feature 92% efficiency.  Other benefits include low voltage operation, synchronizing capability, higher output power for color displays, and extended dimming range.   __ Linear Technology/Analog Devices

Techniques illuminate backlit LCDs with high efficiency -  01/06/94 EDN Technical Article: Getting a backlight LCD lamp to turn on is just the first step in the design process.  Achieving and maintaining high efficiency requires attention to both circuit-design and physical-layout details.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Temperature Controller Drives Peltier Cooler -  06/08/95 EDN-Design Ideas The circuit in "Peltier element controls itself," by Dmitrii Loukianov  (EDN, October 27, 1994, pg 86) is elegant, but it suffers from two potential problems that could arise in some applications.  The first is possible switching-noise injection from capacitive and inductive coupling at the front end of a sensitive analog-signal-conditioning chain  (for example, in a CCD-cooling application) .      __ Circuit Design by Dr Trevor Preston, Cambridge, UK

Test 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.  __ Circuit Design by Soufiane Bendaoud, Analog Devices, San Jose, CA

Tester checks LCDs -  10/03/02 EDN-Design Ideas RF oscillator uses current-feedback op ampManufacturers of electronic equipment use LCDs for calculators, watches, mini-videogames, and pagers, for example.  In comparison with LED-based displays, which consume power on the order of tens of milliwatts, an LCD consumes only a few microwatts.    __ Circuit Design by D Prabakaran

The LM3410 LED Driver -  The LM3410 IC is a constant current LED driver useful in either boost converter or SEPIC design applications.  A SEPIC  (Single Ended Primary Inductance Converter) design allows the power supply’s output voltage to be set above, below or equal to its input voltage.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

The LT1993-2 Driving an LTC2255 ADC Sampling at 96.12Msps with a 70MHz, 4-Channel WCDMA Signal -  70MHz IF signal driver into ADC.  Four to one transformer on input with capacitive coupling into input of LT1993-2, LC filter on output provides Out of Band Filtering.  __ Linear Technology/Analog Devices App Note, Jul 2, 2012

Three-Phase Motor Driver Prevents Stall -  01/05/95 EDN-Design Ideas The circuit in Fig 1 drives a small 24V, 50-Hz motor at about 30 to 40 Hz for use as a chopper motor.  The best starting speed for the motor is about half the final running speed.  Therefore, the circuit uses an intermediate speed to prevent a stall condition.  The circuit uses IC1Ato count down two cycles after the selection of the intermediate speed.  IC1B's Johnson divide-by-three counter and IC2's gates generate the 1208 phase angle __ Circuit Design by PM Kirkby, Crumpsall Electronics, Surrey, England

Timer chip makes universal solenoid drive -  09/01/95 EDN-Design Ideas Mechanical actuators that develop a force from magnetic interaction operate efficiently with high power until seated  (the pull-in state) .  You should then reduce the power to a lower holding level.  These rules are especially true for long-stroke solenoids.  Currently, the only available solenoid-driver ICs are Motorola's MC3484 Series and National Semiconductor's LM1984, which are both designed to drive automotive fuel injectors.  Upon activation, either IC ramps the current to a peak value and switches to a holding current that is one-fourth as large.   __ Circuit Design by Richard Panosh, Vista, Bolingbrook, IL

Tricks improve on Excel LCD initialization -  04/11/02 EDN-Design Ideas A previous Design Ideas on using Excel for LCD initialization relies on the user for cutting and pasting from Excel into an editor (Reference 1].  It appears that it would take a minimum of six keystrokes or mouse strokes from one character to a new character to perform this operation.  This procedure does not allow for the addition of comments, which would be advantageous in the maintenance __ Circuit Design by Aubrey Kagan, Weidmüller Ltd, Markham, ON, Canada

Two Channel Gate Driver for Large IGBT Modules -  The BG2A is a fully isolated two channel gate drive Circuit designed for use with dual IGBT modules.  The BG2A utilizes Powerex VLA500-01 or VLA502-01 hybrid gate drivers to provide efficient switching of modules rated up to 1400A.  The hybrid gate driver features a built-in high speed opto-coupler, short circuit protection and an isolated DC to DC converter with 2500VRMS isolation.  

Two Components Drive Stepper Motor -  EDN-Design Ideas 01/19/95    The extremely simple circuit in Fig 1 drives a stepper motor directly from 120V ac, 60 Hz.  Usually you need switched-dc voltages to drive a stepper motor.  But a stepper motor will run off ac lines if you introduce a 90° phase shift between the voltages applied to the motor's two windings. __ Circuit Design by Carl Spearow, Basler Electric,m Highland, IL

Two-channel audio Amplifier drives stepper Motor -  12/01/06  EDN-Design Ideas Pulse-width-modulated stereo power amplifier saves components __ Circuit Design by Phill Leyva and Bill Quach, Maxim Integrated Products, Sunnyvale, CA

Ultra Low Power LCD Indicator -  This circuit serves as an ultra-low power replacement for multiple LED on-off indicators.  It also has the advantage of being easy to read in full daylight.  With the parts shown, it is possible to display four bits of information.   __ Designed by G. Forrest Cook

Ultracompact LCD Backlight Inverters -  Linear Technology AN81 __ Designed by Jim WilliamsSep 1st, 1999

Ultracompact LCD Backlight Inverters -  AN81 It has become desirable to fashion laptop computers with large area screens, leaving little room for the display's backlight inverter electronics.  Miniaturization limitations of high voltage magnetic transformers impose limits on achievable space reduction.  Another voltage step-up technology, piezoelectric transformers, __ Linear Technology/Analog Devices

UltraLow Distortion IF Amplifier/ ADC Driver with Digitally Controlled Gain -  LT5514__ Linear Technology/Analog Devices

UltraLow Power, 18-Bit, Differential PulSAR ADC Driver  -  A PC with Windows® XP or Windows 7 equipped with an USB port was used to run the PulSAR evaluation software.  , Getting Started The software was installed as described at www.  analog.  com/EVAL-CED1Z , and www.  analog.  com/AD7982_adc_EVAL-CED1Z The PulSAR evaluation software, which is LabVIEW® based, was used to control the Audio Precision input signals and also to monitor the ADC inputs and output.  The software allows the collection and processing of INL, DNL, and FFT data as shown in Figure 2, Figure 3, and Figure 4.  __ Analog Devices from the Lab

Ultralow-cost, two-digit counter features few components -  17-Aug-06 EDN-Design Ideas Two seven-segment displays and one microprocessor count from zero to 99 EDN-Design Ideas __ Circuit Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria

Universal Input TRIAC Dimmable 4W LED Driver -  The LT3799 is an isolated flyback controller with power factor correction specifically designed for driving LEDs.  The controller operates using critical conduction mode allowing the use of a small transformer.  Using a novel current sensing scheme, the controller is able to deliver a well regulated current to the secondary side without using an opto-coupler.  A strong gate driver is included to drive an external high voltage MOSFET.  Utilizing an onboard multiplier, the LT3799 typically achieves power factors of 0.97__ Linear Technology/Analog Devices App Note, Jun 21, 2010

Universal PWM Driver -  PWM drivers are used in analysing, testing, installing and powering all kinds of electronic and electrical devices.  We have published a few designs in Elektor over the years: here we present a ‘de luxe’ version.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

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 __ Circuit Design by Andrzej Wolczko, Institute of Electronics AGH, Krakow, Poland

Using All four Amplifiers of the LT1397 to Drive Large zCapacitive Loads -  Four paralleled amplifiers increase load capacitor current drive capability.  A small ballast resistor at each output increases isolates the effects of each amplifier's different output offset.  __ Linear Technology/Analog Devices App Note, Jun 29th 2012

VCOM adjustment uses any logic-supply voltage 09/30/04 EDN-Design Ideas All TFT [thin-film-transistor] LCD panels require at least one appropriately tuned VCOM signal to provide a reference point for the panel’s backplane.  The exact value of VCOM  varies Page includes several designs.  Scroll to find this one __ Circuit Design by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA

Video Design Idea: Microcontroller drives 20 LEDs -  09/27/07  EDN-Design Ideas Details and demonstrates the use of "Charlieplexing" to drive 20 LEDs using six available I/O pins on an 8-pin microcontroller __ Circuit Design by Dhananjay V Gadre of the Netaji Subhas Institute of Technology in New Delhi, India

Visible Laser Driver Has Digitally Controlled Power Modulation -  App Note/ 228 / Mar-10__ Maxim Integrated

Voltage Monitor -  When the input voltage is 0 the LED glows.  The LED stops glowing when the voltage rises to the level determined by R2.  Reverse + and, pins to reverse operating mode.  To set voltage at which LED goes  __ Contact: IQ Technologies

Voltage-To-Current Converter Makes a Flexible Current Reference -  18-Sep-03 EDN-Design Ideas The voltage-to-current converter in Figure 1 can both source and sink current.  The circuit isflexible than some traditional current references that require different topologies for current sourcing and sinking.  Also, you can easily adjust the value of the current reference by simply adjusting the circuit's input voltage __ Circuit Design by Art Kay, Texas Instruments, Tucson, AZ

Waveform Monitor with LCD -  The result was a project that includes a waveform capture circuit, a graphic LCD  (Liquid Crystal Display) and a control panel with LED indicators.  The details of the Graphic LCD display unit, composed of the LCD module, a serial interface, and bias supply were published earlier on this site,  __ Designed by Dick Cappels

Wideband Low Noise Amplifier Drives 50 Ohm Loads -  10/23/97 EDN-Design Ideas  The circuit in Figure 1 is a wideband, high-gain amplifier with two useful features not often found in combination  The input-referred noise is 2.6 nV/ (square root Hz], yet it can deliver 27 dBm into a double-terminated 50 ohm load or 30 dBm into a single-terminated load.  The circuit uses two monolithic op amps __ Circuit Design by Mitchell Lee, Linear Technology Corp, Milpitas, CA

Wideband, High Input Impedance, Gain = 1000 Amplifi er -  The gain is distributed equally between four amplifier sections in cascade, so the gain of each section is about 5.6.  Distributing the gain uniformly provides the best bandwidth.  Trimming of the final stage corrects for resistor variances so that overall gain is 1000x.  __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Xtimer V1.0 -  Easy build 4-channel timer, suitable for energy saving, simple hardware and nice firmware with c coding.  Automatic power down mode, simple settings, optional buzzer for sound alarm.   __ Designed by Wichit Sirichote

Zener level-shifter drives high-side switch -  06/16/2014  EDN-Design Ideas Simplify a high-side driver by replacing a transistor with a Zener diode.  Microcontrollers, the heart of all modern electronic gadgets, are increasingly powered with sub-5V power supplies.  This complicates the control of external loads powered by higher voltages.   __ Circuit Design by Dhananjay Gadre & Nidhi Sharma

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