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Dual LED Flasher - Some useful circuits using the LM555 IC. Scroll to find the Dual Led Flasher circuit __ Designed by Jose Pino Dual light timer based on PIC-Automatically turn off the lights after 10 minutes - Uses PIC12F629 __ Designed by Peter Jakab
Dual Monostable Drives Quasiresonant Inverter - 02/17/97 EDN-Design Ideas A zero-voltage-switching (ZVS) controller usually integrates a one-shot circuit, embodied in a VCO system. An error amplifier monitors the output voltage and adjusts the VCO's off-time to keep the output value at a constant level. Each on-time period commences as soon as the primary voltage drops to zero, thus eliminating on/off commutation losses associated with the switching element Design by Christophe Basso, Sinard, France
Dual Powered Lighting - Power a lighting circuit from renewable energy or mains electricity. __ Designed by REUK-Renewable Energy UK website
Dual Tandem Flashing Light-Powered by a 9 Volt Battery - This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure. (Personally, I can't recommend you buy anything but the Rollins Railroad Designs kit; for $4.00 you can't go wrong. The 555 IC is about $1.50 by itself at Radio Shack) . If you choose to buy all the parts yourself, realize you need ONLY two LEDs, not two of each; you should be able to mix and match colors. __ Designed by ML Rollins
Dummy Alarm - This project makes a superbright LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. This is a simple project, ideal for a beginner __ Designed by John Hewes
Easy Xenon DC-DC Converter using LM386 - This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don't need to build or wind any coils or transformers. This is a cheap-and-dirty experimenter's circuit. I tested this and it worked for me, but I disclaim all warranties! __ Designed by Don Lipstein
Efficient LED Blinking for Embedded Systems - Smart hardware design can simplify the embedded software and make it more reliable. Designers use blinking LED signals to indicate different status and for inbuilt testability. Making an LED array blink...__ Electronics Projects for You
Efficient LED power supply has battery backup - Power three to six LEDs from an ac- or dc-power source and charge a backup battery. LEDs find wide use in emergency lighting because of their high efficiency __ Designed by Zhihong Yu, Juno Lighting Group, Des Plaines, I - L;
Eight LEDs Random Flasher - This project uses a 4026 counter and display driver IC to flash eight LEDs in an apparently random manner. It can be used to create a display of your choice. __ Designed by John Hewes
El Cheapo Lightning Effect - Plans to simple floodlight using an office rubbish bin made of metal and a "photoflood" bulb
EL wire eye candy - The 8-channel sequencer will switch the wires according to programmed patterns. It uses a Basic Stamp II microprocessor. The Mikey Sklar's el pants & bag and Greg Sohlberg's Rhino-8 sequencer. I used the Basic Stamp II for the processor, and went with Greg's suggestion & used a 9-pin connector, with 8 HV outputs and one "common", instead of individual 2-pin connectors for each of the 8 EL wire channels. __ Designed by guerroloco
Electric Power Controller - suitable as dimmer for 100-Volt lamp up to1200W __ Designed by Seiichi Inoue
Electronic Ballasts using the Cost Saving IR215X - App Note AN-995 from International Rectifier
Electronic candle - This circuit will detect light falling on the Light Dependent Resistor (LDR or CdS) . When light falls on the LDR the arrangement of resistors at the base of the transistor T1 gives a change of voltage. This biases or turns on the transistor which turns on T2, allowing sufficient current to flow to light the globe. The arrangement of the resistors at the base of T1 is called a Potential Divider. It is adjusted to suit ambient light conditions by the variable resistor VR1. A typical use would be to set the project up in the refrigerator. The light will light up in another room if you have enough wire, or you could put a buzzer in instead of the light and catch whoever is raiding the refrigerator.__ CdS Electronic
Electronic Candles - Here is a simple circuit that can produce the effect of candle light in a normal electric bulb. A candle light, as we all know, resembles a randomly flickering light. So,...__ Electronics Projects for You
Electronic Christmas Tree - Schematic + Info + pictures __ Designed by Lennie Zink
Electronic Fluorescent Lamp Ballast - International Rectifier App Note in PDF format
Electronic Night Light - This circuit for an electronic night light was submitted by Adam from Canada. I have provided the notes __ Designed by Andy Collison
Electronic Street Light Switch - Here’s a simple and low-cost street light switch. This switch automatically turns on the light at sunset and turns it off at sunrise. The automatic function saves electricity besides man-power. Broadly, the...__ Electronics Projects for You
Electronic Transformer DIMS Halogen Lamp - 05/11/00 EDN-Design Ideas A typical, switched-mode power supply for a halogen lamp, commonly known as an electronic transformer, is a clever and simple device. However, it has some limitations, such as its inability to dim the lamp. Figure 1 shows a simplified schematic of a typical low-voltage halogen-lamp transformer without the protection circuits and EMI filter. Q1 and Q2 with C2 and C3 comprise a classic, half-bridge topology that works in self-oscillating mode. The circuit provIdeas positive feedback by placing the primary windings of transformer T1 in series with the bridge output. To achieve a high power-factor value, a rectified but unfiltered mains voltage supplies power to the circuit. The working frequency is approximately 30 to 40 kHz. Design by Robert Magdziak, Warsaw, Poland
Emergency 12V Lighting Controller - This easy-to-build project automatically turns on the power for 12V emergency lights within a second or two of a mains power failure. Build it and you won't have to search for candles or your torch in the event of a blackout.__ SiliconChip
Emergency Backup Lamp - This back-up lamp stays off as long as light falls on the CdS photocell from either the NE-2 or from room ambient light. So, if the power fails at night, the lamp will light. The 6 volt lamp should be directed away from the photocell __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Emergency Lamp & Turning Indicator - 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
Emergency Lamp Battery Protector - Emergency lamps do not have a facility to prevent the deep discharge of battery if the lamp remains on during day time. The fluorescent lamp filament also damages if it is glowing in low battery voltage. This causes blackening of the filament side that indicates the damaged filament. So we have to switch off the lamp in the __ Designed by D Mohankumar
Emergency Light - A simple circuit that activates a light when the power is out. A version with a lightbulb and another with white LED light included. __ Designed by Jose Pino
Emergency Light & Alarm - Powered by two AA NI-CD batteries; Four switchable options __ Contact: Flavio Dellepiane, fladello @ tin.it
Emergency light flasher schematic - If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do. A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device. The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna. __ Designed by Guy Roels ON6MU
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
Emergency Photo Lamp - This emergency light can be powered either by a rechargeable battery (like 3.6V Ni-Cd) or a non-rechargeable battery (3.0V CR2032) . The white LED (LED1) glows automatically when the power fails and...__ Electronics Projects for You
Emergency strobe flasher generates 250V - 08/05/99 EDN-Design Ideas Figure 1 shows a complete circuit for an emergency lamp that operates from a 12V automotive battery. The xenon flash tube requires a 250V-dc anode voltage and a 4-kV trigger pulse. To generate the 250V dc, IC1, Design by Jose Luis Arce, Tecnosuma Havana, Cuba
Emergency Vehical Flasher - There are several projects on this page. Please scroll down to find the LED Chaser. __ Designed by Jason KE4NYV from Roanoke, Virginia
Emissions killers trap common-mode currents - 03/02/98 EDN-Design Ideas NOTE
: Contains multiple circuits, scroll for this one. An unshielded twisted-pair cable that is transformer-coupled to a digital system can easily act as a radiating antenna, not because of the differential analog signal the cable carries, but because of common-mode currents induced by unwanted stray coupling from the digital portions of the system. These currents from fast digital transitions contain harmonics in the hundreds of megahertz and can be a nightmare to design engineers who have to make systems conform to radiated-emissions limits. Design by Glen Chenier, Fujitsu Network Communications, Richardson, TX
End of Train Flasher - Schematic + Info + pictures __ Designed by Lennie Zink
Expandable 16 Stage LED Sequencer - The circuit below uses a hex Schmitt Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers (74HCT164 or 74HC164) to sequence 16 LEDs. The circuit can be expanded to greater lengths by cascading additional shift registers and connecting the 8th output (pin 13) to the data input (pin 1) of the succeeding stage. A Schmitt trigger oscillator (74HC14 pin 1 and 2) produces the clock signal for the shift registers, the rate being approximately 1/RC. Two additional Schmitt Trigger stages are used to reset and load the registers when power is turned on. Timing is not critical, __ Designed by Bill Bowden
Experimental Cross Fader - ideas to modify simple rotary light dimmers to make a cross-fader |
