Make a 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

Measure 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 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.-January, 2006

Microcontroller Drives LCD with Just One Wire -  3-Dec-07 EDN-Design Ideas A Microchip PIC10F family microcontroller sparks an HD44780 LCD using a single I/O pin Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria

Microcontroller Drives Piezoelectric Buzzer At High Voltage -  03/01/12  EDN-Design Ideas Drive the buzzer directly from the μC’s 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.   Design by Mehmet Efe Ozbek, PhD, Atilim University, Ankara, Turkey

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

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

Microcontroller pin senses Ambient light, controls illumination -  10/26/06  EDN-Design Ideas LED circuit senses light and controls its own brightness Design by Loren Passmore, Berkeley, CA

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

Microcontroller, JFET form low-cost, two-digit millivoltmeter -  06/22/06 EDN-Design Ideas Software subroutines replace hardware A/D converter Design 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 Ideas Bar-graph display spares processor I/O lines Design by R Jayapal, PhD, Bharat Heavy Electricals Ltd, Trichy, India

Micropower High-Side MOSFET Drivers -  AN53 Linear Technology This App 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/Analog Devices

Microstepping stepper Motor driver with PBM3960 & TEA3719 -  This Microstepping motor driver offers a short cut to get familiar with microstepping.  It is a complete system to driver the bipolar stepper motor in micro-stepping mode as well as the half step and full step modes.  This board is built around the Ericsson PBM3960  (NJR NJU39610) microstepping controller and TEA3718 stepper motor driver __ Contact: info @ wzmicro.com

Minimum Mass Waveform Capture & Display -  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

Modular Relay SystE - M -  This is simple transistorised relay into which can be plugged 'personality modules' to turn the base unit into a timer  (pulse, delay on energise or delay on de-energise) or a latching relay or whatever is required.  This is therefore a universal relay system.  It was designed to simplify industrial machinery control.   __ Designed by Richard Torrens

MOSFET serves as Ultrafast Plate Driver -  10/03/02 EDN-Design Ideas The circuit in Figure 1 provIdeas a 20-MHz square wave across a set of highly capacitive ion-deflection plates in an experimental instrument.  To get the required deflection, the plate voltage must be 20 to 30V, much higher voltage than conventional logic or driver families can provide Design by Clive Bolton, Bolton Engineering Inc, Melrose, MA

Motor driver-74*245-based  -  A simple, time-honored approach is to use one or more 74*245 chips  (normally74AC245 is used for maximum current capability) to provide motor drive current.  Here, each channel of drive power is provided by one or more buffer onchip.   __ Designed by Wilf Rigter

Multi-Channel Hardware Driver for Embedded Systems -  Introduction The real world embedded systems are controlling DC motors, step motors, electromagnetic relays, incandescent lamps, powerful LEDs, displays, inductors, transformers, long cables, etc.On the market we can find large variety of...__ Electronics Projects for You

Multifunction LCD Clock with Raspberry Pi -  With just two simple Python files, an inexpensive LCD display and a low-cost digital temperature sensor, you can turn Raspberry Pi into a beautiful LCD clock with IP address and temperature...__ Electronics Projects for You

Multiple Relay Drive -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Muscle power drives battery-free Electronics -  11/21/05  EDN-Design Ideas Your sweat and a super-cap replace the battery Design by Alexander Bell, Infosoft International Inc, Rego Park, NY

NiCd Cells Drives Op Amp -  12/05/96 EDN-Design Ideas Low-supply-voltage op amps, such as the LMC6582 and LMC6681 families, feature rail-to-rail I/O with a gain-bandwidth product greater than 1 MHz operating from just 1.8V.  Although impressive, this voltage is not low enough to power these amps using a single alkaline or NiCd/NiMH cell, which have typical voltages of 1.25 to 1.5V.  It is rather tempting to bridge this gap by designing a DC/DC converter Design by Alexander Belousov, Rego Park, NY

Nokia 3310 LCD & PIC12F629 Thermometer -  Device with Nokia 3310 Lcd, Pic12F629 & DS18B20 temperature 1Wire sensor  published in magazine "Svijet elektronike" Nr.58  (June / July 2006)  .   Author: Ivica Novakovic __ Designed by © Ivica Novakovic

Nokia 7650 LCD Controller -  Despite nobody seems to own the appropriate documentation, it is possible to use the big cheap color LCD displays of the Nokia series 60 cell phones for home brew projects.  I don't even have the docs and it was a rough and painful way, but now it works

On/Off Latch Circuit with 2 Second Delay -  A Discover Circuits visitor needed a latch circuit which could operate using a power supply voltage ranging from 3v to 24v.  He wanted to use a tiny pushbutton switch to turn on and off power to a load.  However, he wanted a 2 second delay between the switch activation and the state change of the output. . . Circuit by David Johnson P.E.-June, 2013

One component drives stepper Motor -  The extremely simple circuit in Fig 1 drives a stepper motor directly from 12V ac , 60 Hz power supply.  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.  In this case only one 6.8uF non polarity capacitor is needed.   __ Contact: info @ wzmicro.com

One I/O line drives shift register with strobe -  03/28/13  EDN-Design Ideas This Design Idea shows how a single microcontroller port can drive a lot of output lines through shift register. by Zoran Mijanovic & Nedjeljko Lekic

One IC Biases LCD & GaAsFET Amplifier -  04/09/98 EDN-Design Ideas -  (File ,contains several circuits, scroll to this one) Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in Figure 1  provIdeas 6V bias for LCDs and a separate, quiet negative bias for a GaAsFET power amplifier.  This bias combination exists in cell phones Design by John Wettroth, Maxim Integrated Products, Apex, NC

One wire brings power & data to LCD Module -  01/27/14EDN-Design Ideas If you need to connect a small remote LCD display, or your µC has run out of I/O pins, here’s a good, cheap solutionEmbedded systems frequently use HD44780type LCD displays as it is considered the most popular alphanumeric display controller.  The interface comprises at least 14 pins: eight for data, three for control    (EN, WR, RS) , two for power supply    (Vdd, Vss) , and one for contrast    (Vre) .  Configured in 8bit mode, it requires at least 10 I/O lines    (D0D7, EN, RS) .  Configured in 4bit mode, it requires at least six I/O lines    (D4D7, EN, RS)  Design by Benabadji Noureddine

One wire controls LCD Module -  EDN-Design Ideas 03/20/2017    This one-wire LCD interface DI generates all the signals required to control the ubiquitous character display Design by Rex Niven

One-Pulse-Per Second Driver for Quartz Clocks -  This simple add-on module for the GPS-Based Frequency Reference is designed to drive the escapement coil of a low-cost quartz clock movement.  It uses the 1Hz GPS pulses available at the rear of the Frequency Reference so that the clock can display local time with GPS-based accuracy.__ SiliconChip