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IC Controlled Emergency Light with Charger - White LEDs are replacing the conventional incandescent and fluorescent bulbs due to their high power efficiency and low operating voltage. These can be utilised optimally for emergency lamp and vehicle turning...__ Electronics Projects for You
Impedance transformer flags failed fuse - 17-Dec-04 EDN Design Ideas: Figure 1depicts a circuit that detects the opening of a miniature circuit breaker or high-rupture-capability fuse in a high-reliability telecommunications power supply. The circuit generates an alarm when a failure changes the impedance of an electromagnetic sensor. Traditional fault-detection circuits sense the voltage difference developed across an open fuse, leakage current flowing through Design by Kevin Ackerley, Future Electronics, Vancouver, BC, Canada
Improved Laser-Diode-Clamp Protects Against Overvoltages - 05/29/08 EDN Design Ideas: Adding a bipolar transistor to a JFET laser-diode clamp protects high-current laser diodes Design by James Zannis, Baulne-en-Brie, France
Increase your driving safety with Quick Brake - Simple project turns your brake lights on faster than you could ever apply them, to reduce rear-end shunts.__ SiliconChip
Indicate AC-Mains-Fuse Failure - 01/08/09 EDN Design Ideas: Use this circuit to alert you when a fuse fails Design by Vladimir Oleynik, Moscow, Russia
Indicate Health of Lithium-Ion Batteries - 05/14/09 EDN Design Ideas: A simple inexpensive circuit quickly indicates a battery pack's health Design by Fritz Weld, Friedberg, Germany
Inexpensive self-resetting breaker requires few parts - 01/22/09 EDN Design Ideas: The circuit breaker pulses power through a pass transistor when the current gets too high, thus protecting the part from excessive heat Design by Anthony H Smith, Scitech, Bedfordshire, England
Infrared Safety Switch - Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch. . . Circuit by Dave Johnson P.E.-July, 2006
Input-protection scheme tops other approaches - 01/06/00 EDN Design Ideas: You typically accomplish overvoltage or surge protection at circuit inputs by connecting diodes to the supply rails, connecting zener diodes to ground, or connecting transzorbs to ground. Design by Kannan Natarajan, Mediatronix Private Limited, Kerala, India
Inrush limiter also provides short-circuit protection - 06/09/05 EDN Design Ideas: MOSFET keeps inrush currents due to capacitive loads under control Design by Ryan Brownlee, Process Automation Division, Pepperl & Fuchs Inc, Twinsburg, OH
Inverted Regulator Increases Choice & Reduces Complexity - 112/05/09 EDN Design Ideas: A simple approach for any high side overcurrent-protection circuit references the entire circuit to the high-side rail Design by David McCracken, Aptos, CA
Isolated Driver Forms Solid-state Breaker - 03/02/98 EDN Design Ideas: (File contains many circuits, please scroll to find this one) This circuit allows standard TTL logic levels to safely drive a high-power dc load, circuit provide as also overcurrent circuit breaker functionality. Design by Bobatson, Corley Manufacturing Co, Chattanooga, TN
Load switch with self-resetting breaker - EDN Design Ideas: 10/20/2014 Protect both load and driver with this elegant little Design ideas Design by Anthony Smith
Logic PSU with OverVoltage Protection - A simple 5 Volt regulated PSU featuring overvoltage protection. __ Designed by Andy Collison
Loud Speaker Protection & Muting - Protect speakers from turn-on and turn-off transients and amplifier faults __ Designed by Rod Elliott ESP
Low Voltage 120vAC Power Line Alarm - This circuit will turn on a beeper when the line voltage drops below 100 volt AC.. . . Circuit by Dave Johnson P.E.-July, 2006
Low-error platinum RTD has shutdown capability - 09/14/00 EDN Design Ideas: Resistor-temperature detectors (RTDs) , are the most stable and popular temperature sensors. Platinum RTDs allow for a much wider range of temperatures than silicon-based sensors. in many cases, platinum RTDs sit far from the measurement circuitry, which adds a great deal of error into the measurement system. The circuit in Design by Reza Moghimi, Analog Devices, Santa Clara, CA
LTC Design Note: Robust 10MHz reference clock input protection & distributor for RF systems - 07/31/14 LTC Design Notes: Design a protected 10MHz reference input without degrading phase noise. Design by Michel Azarian
Mains Supply Failure Alarm - When ever AC mains supply fails, this circuit alerts you by sounding an alarm. it also provides a backup light to help you find your way to the torch or the...__ Electronics Projects for You
Mains Supply Failure Backup Light - in the event of a sudden blackout at night, this circuit switches on automatically to provide sufficient light for around 30 seconds (extendible) , which is enough to switch on an emergency lamp or light up a candle. __ Designed by Arthur Louis
Make a Simple Circuit PC-Based frequency meter - 04/29/99 EDN-Design ideas – NOTE: Scroll to find this circuit. A simple, low cost, and precision frequency meter uses only two pins of a pc parallel port (Figure 1). The TTL-level periodic input signal with frequency fiN connects to the ACK pin of LPT1. Design by Radovan Stojanovic, University of Patras, Patras, Greece
May Save Property & Life - 05/13/10 EDN Design Ideas: The circuit in Figure 1 sounds an alarm whenever the perimeter- protection line—a thin copper wire of appropriate length—breaks. You can get the thin wire from a used relay coil. Place the wire around a tent, a camping area, or a Design by Vladimir Oleynik, Moscow, Russia
Measure Motor Speed Uses Low-Cost Components - 11/08/07 EDN Design Ideas: A microcontroller-based circuit provide as 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
MEET BLINKER-blinking LED's - Our BLiNKER has many applications; fill your party with blinking BLiNKERS. Mount the BLiNKER on your bicycle so you'll be more visible and have a safer ride. Mount it on the car dashboard as an alarm flashing light imitator. Or mount it on your room door (i. e. please do not disturb). Place BLiNKER anywhere you’d like to draw attention and a smile. The unique small design will allow you to mount it almost anywhere. Operate it with 9V battery 12V car battery, via two 1.5V batteries, or via one of our battery simulator kits. __ Contact Kit from Elich Industrial Development, Corp
Method offers fail-safe variable-reluctance sensors - 11/22/01 EDN Design Ideas: Variable-reluctance sensors are preferred for industrial and automotive environments, because they sustain mechanical vibration and operation to 300°C. in most applications, they sense a steel target that is part of a rotating assembly. Because the unprocessed signal amplitude is proportional to target speed, a sensor whose signal-processing circuitry is designed for high speed cease Design by Phil Levya, Maxim Integrated Products, Sunnyvale, CA
Method provides automatic machine shutdown - 27-May-04 EDN Design Ideas: Some machines need to run for long periods and therefore may finish their work in the middle of the night or during the weekend. For the time remaining, until the operator returns, the machines stay idle, uselessly consuming power. This design idea allows a machine to completely shut itself down after finishing its work Design by Jean-Bernard Guiot, Mulhouse, France
Method provides overpower protection for quasiresonant supplies - 28-Oct-04 EDN Design Ideas: The main characteristic of quasiresonant switch-mode power supplies is that they exhibit a varying frequency when the input voltage changes. For a flyback power supply, the power delivered to the output obeys the following equation POUT=1/2 (LP×iP 2×FSWη], where LP is the primary inductance, IP is the peak primary current, FSW is the switching frequency, and η is the e Design by Nicolas Cyr, On Semiconductor, Toulouse, France
Microcontroller protects DC-motor - 02/17/05 EDN Design Ideas: Although any overloaded dc motor can draw excessive current and sustain damage, a cooling fan's motor is particularly vulnerable due to fouling by dust, insects, or misplaced objects. A few fans include built-in overload protection Design by Abel Raynus, Armatron International Inc, Malden, MA
Modified LED Night Light - I bought some night lights a few months ago from Walmart here in Denver. The devices were made by Elumina Lighting Technologies inc. (www. eluminalighting. com) , their model LED-6200A. I think I paid about $15 for a pack of three lights. I wanted a light . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2007
Monitor & Protect Automotive Systems with Integrated Current Sensing - DN374 Design Notes__ Linear Technology/Analog Devices
MOSFET Beats Murphy's Law - 12/22/94 EDN Design Ideas: Consider it Murphy's Law: You buy two 15V supplies or one ±15V dual supply to power some op amps. Then, when the last QA inspector or first customer flips the switch, the power supply hangs up. This hang-up occurs because the positive supply yanks its output to positive. The negative supply reads this output as a reverse polarity before it has a chance to start up. So, the supply's negative regulator gives up. Design by Phil Harvey, Technology Integration Inc, Bedford, MA
Motor uses Simple Circuit reverse-battery protection - 18-Mar-04 EDN Design Ideas: This design idea presents a low-side, reverse-battery-protection technique for a dc-motor system. The system in Figure 1 incorporates two protection options. The common practice of using a diode for reverse-battery protection does not work with dc motors' inductive loads. in Figure 1, an Allegro (www. Allegromicro.com) A3940, a low-cost power MOSFET controller, drives a dc motor. An H-bridge for driving the motor comprises the n-channel MOSFETs Q0 to Q3. To change the motor's direction from forward (current flowing from Phase A to Phase B) to reverse, the direction of current in the motor winding must reverse. Design by Dongjie Cheng, Allegro Microsystems, Warminster, PA |
