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Fuse-Panel Emergency Light - The area around the Main Electrical Panel is usual pretty dark, especially if it is located in the basement. That's during daylight hours. At night everything is dark during a powerfailure, or tripped circuit breaker, fuse, etc. This circuit provides ample time to fix the problem __ Designed by Tony van Roon VA3AVR Galloping Neons - Here is a line powered array of blinking neons designed for continuous duty. It would be quite dangerous to power a circuit directly from the power line so some form of isolation is needed. Since most experimenters will not have 120 volt isolation transformers __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Game Show Who's First Indicator Lights - The circuit above turns on a light corresponding to the first of several buttons pressed in a "Who's First" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps. Three SCRs (silicon controlled rectifiers) are connected with a common cathode resistor (50 ohm) so that when any SCR conducts, the voltage on the cathodes will rise about 7 volts above the voltage at the junction of the 51K and 1K ohm resistors and prevent triggering of a second SCR. When all lamps are off, and a button is pressed, the corresponding SCR is triggered due __ Designed by Bill Bowden
Garage Light & Security Control - Useful for vehicle owners, this gadget automatically turns on indoor/outdoor garage lights and raises an alert when an automobile enters the garage. Assume switch S2 is in ‘on’ (closed) state. When power...__ Electronics Projects for You
Generator Room Light - At night when power fails, one finds it difficult to reach the generator to start it. Here is the circuit for a generator room light that automatically turns on at night,...__ Electronics Projects for You
Grand Cherokee Off Highway Lights - I purchased my 95 ZJ as a daily driver and as a tow rig for my CJ-7. I have to drive roughly 240 km (110 miles??) a day. A lot of this driving is done in the dark, and since I live in the woods, there is naturally a lot of wildlife to be seen, and hit. I also didn't want to hit another deer (hit one almost one month after I bought it) . I felt that the high beams on my ZJ were inadequate, so I decided to add some high powered lights. I purchased four Pro Comp 8 inch 130 watt lights. I mounted them on a roof rack that I built, which also holds my spare tire and 55-watt reverse light (which I get to later) . __ Designed by Mike Mueller
GrantronICs Projects Christmas Tree - flashes LEDs mounted to Christmas tree shape PCB, kit from kitsrus. com __ Designed by © Grantronics Pty Ltd
Green/Red Multiflasher - NOTE
: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Hacking the Kodak Max Single Use Flash Camera into a Self-Repeating Strobe - NOTE
this approach is recommended mainly for Homebrewing a strobe that is powered by a single 1.5 volt battery. If you can use a higher supply voltage, there are better ways to do this. __ Designed by Don Klipstein
Half Bridge Inverter has Variable Frequency - 10/09/97 EDN-Design Ideas Modern electronic ballasts require added features, such as high-frequency preheat for filaments, nominal lamp-power control, and light-dimming capability. Because the output inverter operates in resonant mode, you can control the power or current of these ballasts simply by varying the switching frequency. To vary the frequency, Design by Thierry Castagnet, SGS-Thomson Microelectronics, Schaumburg, I - L
Halloween Flashing-Eyes Badge - Two LED-eyes follow the rhythm of music or speech; 3V Battery-operated device suitable for pins or badges __ Contact: Flavio Dellepiane, fladello @ tin.it
Halloween Pumpkin with Colorful LED Candles - Extensive tutorial on putting blinking LEDs and different colored LEDs into jack-o-lanterns. Includes schematics, solderless breadboard photos, and three movies (the blue pulsing LED is my favorite) . Great way of getting started in electronics! Although this was written for Halloween, the techniques are applicable for Christmas votive candles as well. __ Contact: David Cook
Halogen Lamp Saver for Bikes - Halogen lamps are prone to burn-out owing to their low cold current. The rapid heating inside the lamp melts the thin filament and cuts the lamp life short. The circuit described...__ Electronics Projects for You
Halogen light dimmer provides infinite control - 03/16/00 EDN-Design Ideas Modern lighting systems use halogen lamps, most of which run on 12V ac from a transformer. The dimmer circuit in Figure 1 can change the intensity of the light from zero to maximum. The dimmer operates at approximately 12V, unlike the usual ones that function by adjusting the firing angle of the 110 or 220V mains supply Design by Suded Emmanuel
HB-LED flashing beacon repurposes switching regulator - EDN-Design Ideas 08/04/2014 A classic, low-cost “switcher” IC is repurposed to flash a high-brightness LED in this minimal-parts-count Design Ideas - Design by T A Babu
H-Bridge - This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first. Using bigger parts could make it more powerful. Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it themselves, and I thought it was about time to show a tested H-bridge motor driver that didn't use exotic parts __ Designed by Bob Blick
H-bridge paves New ways for LED lighting - 07/11/13 EDN-Design Ideas Drive a LED array directly from the AC mains in full-wave current-limited mode to realize a flicker-free, energy-efficient solid-state lamp. The H-bridge is a classic circuit used for driving DC motors in a user-defined manner, such as in forward/reverse direction or PWM-assisted controlled RPM with the help of four discrete/integrated switches or electromechanical relays. It is widely employed in robotics and power electronics. This Design Idea is a novel implementation of this technique for driving white-LED arrays directly from the AC mains in full-wave current-limited mode to realize an excellent flicker-free, energy-efficient solid-state lamp. Design by Subodh Johri
Headlight Minder - Turns OFF your Headlights, if you forget. And with a Time Delay, if wanted. __ Designed by G.L. Chemelec
Heart of LEDs - Here is a fun project that you can give to that "someone special". How about Mother's Day or did you forget St Valentine's Day?. __ Designed by © Grantronics Pty Ltd
Heart-shaped Badge - The badge consists of eight LEDs arranged in the shape of a heart. One LED is lit at a time and this 'chases' round the shape. It would be easy to adapt this project to create other shapes with the eight LEDs. __ Designed by John Hewes
High Efficiency Halogen Bike Light Dimmer - This circuit uses a PIC16F84 microcontroller with some software to control20-Watt12V DC halogen lamp
High Intensity Line Powered LED Flasher - There are times when you would like to generate an intensely bright flash of light using electrical power from the AC line. The circuit below can drive a one to three watt power LED with about 350ma of peak current. Since the circuit drives the LED with. . . Circuit by David Johnson P.E.-December, 2008
High Power Flashing LED - The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 7 Mar 2010
High Power LED Flasher - Power LEDs are becoming more popular these days. The DC input power to these devices ranges from 1 watt to 5 watts. Normal LEDs only receive about 0. 05 watts. At this higher power, these devices can emit a lot of light . . . Dave Johnson, Lubbock TX (Aug 10, 2008)-DC Magazine - Issue 7 Mar 2010
High Power LED Mood Lamp - in this page we will introduce a great project designed by Toon Beerten. His project named "DIY LED Mood Lamp" can become a very interesting add-on for your room that's absolutely sure it will impress everyone. As you can see on the photos, we talk about a color fading lamp, that looks amazing! __ Designed by Toon Beerten
High-Power_Flashing_LED - The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 7 Mar 2010
Highway Alert Signal Lamp - Here is a signal lamp for safe highway driving. The lamp automatically emits brilliant tricolour light when a vehicle approaches the rear side of your vehicle. It emits light for 30...__ Electronics Projects for You
HO Model Train Lighthouse Flasher - HO train sets often have authentic looking scale model homes and buildings. The hobby circuit below can be mounted inside a model lighthouse. The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotation . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006
HO 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 Johnson P.E.-December, 2012
How to Make a Business Card Flashlight - The aim of this article is to make a business/visiting card useful, something that people really do not want to throw away and use as a piece of advertising. Essence of...__ Electronics Projects for You
How to Make Chase Lights - This example shows3 track chase lights built from3-Christmas light sets and1-light chaser controller |
