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Four Channel HOME Color Organ - FOUR Channels. All Channels are Active Band Pass Filters. __ Designed by G.L. Chemelec 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.
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
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
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
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 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. . . Circuit by David Johnson P.E.-August, 2008
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 Chase Lights - This example shows3 track chase lights built from3-Christmas light sets and1-light chaser controller
Increased power for 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 . . . Hobby Circuit designed by David A. Johnson P.E.-August, 2008
Inexpensive LED Drives Flash & Beep - 06/05/97 EDN-Design Ideas Sometimes, you need an alarm that is both audible and visible in an application that's stingy with space, power, and budget. The circuit in Figure 1a is compact, efficient, and inexpensive. The F336HD flashing LED (part no.276-036 at Radio Shack) is a useful device. It operates directly from 5V and produces a consistent pulse of light at approximately 1 Hz without a time-constant capacitor. Design by Dennis Eichenberg, Parma Heights, OH
Interior light extender - All modern cars are fitted with door-switch operated courtesy lights. Useful devices, but not quite as useful as they might be because they are so arranged that the light is extinguished as soon as you close the doorjust when you need light to find the ignition switch. do up your seat belt etc. How much better if the internal light stayed on for a few seconds after the door is closed. This little project does just that. It provides a four-second delay (approx) after which the interior light slowly dimsbeing finally extinguished after 10 or 12 seconds. The unit is very simple to construct and once tested and properly insulated it may be wired across one of the car door switches. In operation, after a short delay the lights will gradually dim until they are completely extinguished. There is no battery drain in the off-state as the unit only operates during the delay period after the door is closed.__ CdS Electronic
Jumbo Flashing LED Lights - This is a flashing led lights circuit powered from a 12V DC power supply that uses the well known 555 IC. Flashing lights have many and varied applications in life. They are used as warning lights on highways to increase road safety, as beacons on towers, as advertising signs on shop windows, and so on. Mechanically operated __ Designed by T.K. Hareendran
Knight Rider Lights-LED Chaser - I don't know why, but people like blinking lights. You see LED chasers everywhere, in TV shows (Knight Rider) , movies, and store windows. This schematic is my version of a simple 10 LED chaser. There is no 555 timer used because __ Designed by Aaron Cake
Knight Rider Look-a-like Lights - 12 Volt Knight Rider, "Look-A-Like", Lighting Systems Revised "JAN.2, 2008" (Errors on Knight-3, Corrected) __ Designed by G.L. Chemelec
Knightrider lights for Model cars - This simple circuit drives 6 LEDs in 'Knightrider scanner mode'. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS
version) . __ Contact: IQ Technologies
Kodak Max flash unit - Schematic for the Kodak Max flash unit __ Designed by Don Klipstein |
