LX1995 LED Driver: Camera Flash ApplicationAN-30  -  Application Note 30. . .  [Microsemi Corp]

Make a Universal VCSEL Driver  -  10-Jul-03 EDN Design Idea   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. . .  [by Andrzej Wolczko, Institute of Electronics AGH, Krakow, Poland]

Measure Motor Speed Uses Low-Cost Components  -  11/08/07  EDN Design Idea   A microcontroller-based circuit provides both an LCD readout and an analog motor-speed output. . .  [by R García-Gil, J Castelló, and JM Espí, Escola Tècnica Superior d’Enginyeria, University of Valencia, Spain]

Measuring Motor Speed Uses Low-Cost Components  -  11/08/07  EDN Design Idea   A microcontroller-based circuit provides both an LCD readout and an analog motor-speed output. . .  [by R García-Gil, J Castelló, and JM Espí, Escola Tècnica Superior d’Enginyeria, University of Valencia, Spain]

Medium Power 40Khz Ultrasound Transducer Driver  -  This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal . . . [Circuit by David A. Johnson P.E.,  01/29/06]

Microcontroller converts digital-temperature-sensor readings without floating-point arithmetic  -  03/05/09  EDN Design Idea   Convert digital-temperature-sensor readings without floating-point arithmetic. . .  [by Jordan Dimitrov, Toronto, ON, Canada]

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

Microcontroller drives H bridge to power a permanent-magnet DC motor  -  03/15/07  EDN Design Idea   Improved H-bridge requires only two driver signals. . .  [by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy]

Microcontroller Drives LCD With Just One Wire  -  12/03/07  EDN Design Idea   A Microchip PIC10F family microcontroller sparks an HD44780 LCD using a single I/O pin. . .  [by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria]

Microcontroller drives logarithmic/linear dot/bar 20-LED display  -  01/18/07    EDN Design Idea   Do-it-yourself analog-to-LM3914 display driver offers user programmability. . .  [by Dhananjay V Gadre and Anurag Chugh, Netaji Subhas Institute of Technology, New Delhi, India]

Microcontroller Drives Piezoelectric Buzzer At High Voltage  -  03/01/12  EDN Design Idea   Drive the buzzer directly from the μCs I/O pins. Piezoelectric buzzers find wide use in embedded systems for audible-signal generation. You can drive a piezoelectric element directly from a microcontroller’s I/O pins, but the maximum voltage rating and loudness of a piezoelectric buzzer are typically several times larger than the voltage an I/O pin supplies. Using four enhancement-mode MOSFETs that connect in an H-bridge configuration, the microcontroller can drive the buzzer at a high alternating voltage. The gate terminals of the N-channel transistors in the lower arms of the bridge can connect directly to the microcontroller’s I/O pins. The voltage level on the I/O pins is insufficient for switching the P-channel transistors, however. . .  [by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey]

Microcontroller Drives Piezoelectric Buzzer At High Voltage Through One Pin  -  08/17/12  EDN Design Idea   If you're short on I/O pins, this circuit might solve your problem. . .  [by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey]

Microcontroller functions as voltmeter  -  10-May-07 EDN Design Idea   PIC microcontroller and FETs enable a four-digit voltmeter. . .  [by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria]

Microcontroller pin senses ambient light, controls illumination  -  10/26/06  EDN Design Idea   LED circuit senses light and controls its own brightness. . .  [by Loren Passmore, Berkeley, CA]

Microcontroller provides low-cost analog-to-digital conversion, drives seven-segment displays  -  10-May-07 EDN Design Idea   Versatile conversion circuit detects and displays signal's peak value. . .  [by Name withheld[by author’s request]

Microcontroller, JFET form low-cost, two-digit millivoltmeter  -  06/22/06  EDN Design Idea    software subroutines replace hardware A/D converter. . .  [by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria]

Microcontroller's single I/O-port line drives a bar-graph display  -  07/06/06  EDN Design Idea   Bar-graph display spares processor I/O lines. . .  [by R Jayapal, PhD, Bharat Heavy Electricals Ltd, Trichy, India]

Micropower High-Side MOSFET Drivers  -  AN53 Linear Technology This application note describes the operation of high-side Nchannel MOSFET switch drivers designed specifically for operation in battery-powered equipment, such as notebook and palmtop computers and portable medical instruments. A selection. . .  [Linear Technology]

Miniature Lighthouse Light Simulator  -  The circuit I came up with is shown below. It uses two dual low power op Amps. The first two devices form a classic oscillator circuit whose output is a triangle waveform signal. That signal is routed to a current regulator circuit, which converts the triangle voltage signal to a triangle current signal through the lighthouse LED. A third op Amp generates pulses timed so they occur at the peak of the triangle waveform. The result is a LED, which gradually grows brighter, then flashes even brighter before dimming again. This should produce a light, which simulates a rotating lighthouse light . . . [Circuit Solution by Dave Johnson P.E.,  05/07/06]

Model Airplane Wing Tip Flasher  -  The circuit below is designed to flash two white LEDs mounted at the wing tips of a model airplane. The flasher unit is powered by a 4. 5v supply made of three AA or AAA 1. 5v alkaline battery cells. The average current is about 2ma so a set of batteries . . . [Hobby Circuit designed by Dave Johnson P.E.,  10/18/09]

Model Train Lighthouse Flasher Revisited  -  HO train sets often have authentic looking scale model homes and buildings.   A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.   I designed a working circuit but I was never pleased with the results.   I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit. … [Hobby Circuit designed by Dave Johnson P. E. , May 2012] . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/20/12]

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