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Fast, Portable Light Pulser - 10/16/03 EDN-Design Ideas The absence of a fast one-shot multivibrator in the entire TTL family, as well as the low-voltage swing and unwieldy supply requirements of ECL, drove us to exploit the fast transition times and low propagation delays of F-series g Design by SK Kaul and IK Kaul, Bhabha Atomic Research Centre, Trombay, Mumbai, India Fine Control SuperBright LED Pulser - Four timing controls12V supply; Suitable for Halloween or Christmas props __ Contact: Flavio Dellepiane, fladello @ tin.it
Firefly Lights - This firefly lights flasher is an easy, fun project. It can be built on the tiny circuit board, or on perf board. Specifications Battery life: approx 1 year using the NXP 7555 CMOS
timer IC & standard alkaline battery, or about 6 months using the more common TI TLC555 Flash rate: approx 0.25 Hz (unless using optional __ Designed by Jim Keith
Five Equals Four with a Diode OR - 5-Jun-06 -Design News: Trailer rental firms insist that tow vehicles provide operating lightsturn, tail and brake lights for every towed vehicle rented. Easy to do if the tow vehicle is wired that way, but a pain if it has separate turn and stop lamp circuits. John's solution is a pair of diodes, some quick __ Gadget Freak-Case #85
Five-to 10-LED Flashlight Runs At 3V - 12/15/08 EDN-Design Ideas With this simple circuit and easy-to-find components, you can convert bulb flashlights into energy-efficient, bright LED flashlights Design by GY Xu, XuMicro, Houston, TX
Five-Watt Fluorescent Lamp Intensity Modulator - The circuit was designed to experiment with using small fluorescent lamps as a broad pattern source of modulated light. The circuit hits the small lamp with narrow 1us pulses at a rate of 10KHz. Each pulse launches about 10 watts of visible light. The lamp. . . Circuit by David Johnson P.E.-June, 2000
Flash Slave Trigger - Flash slaves are used when you need to supplement1-flash unit with1-or several more. This slave trigger simply triggers those other units. It does this by "seeing" the first flash (using a phototransistor) and triggering the other flashes a few microseconds later. The sensitivity of the circuit is adjustable to compensate for ambient light or dimmer than usual master flashes. __ Designed by Aaron Cake
FlasherLEDs - This is a very simple project using a printed circuit board and 8 components. It will flash an ordinary 3mm or 5mm (1/8" or 1/4") LED at a rate of about one flash per second.
Flasher for Deepawali - Here is the circuit for a portable electric lamp-cum-LED flasher. It uses a 25W, 230V AC bulb and nine LEDs. When the bulb glows all the LEDs remain 'off, 'and when...__ Electronics Projects for You
Flasher Operates Off AC Mains - 06/23/11 EDN-Design Ideas A few components create an illuminated switch. Looking for a mains switch in the dark is easier if the switch contains a built-in neon or filament miniature lamp. Adding a small indicator to any mains switch is heLPFul. It is even better if the indicator flashes. This circuit makes a simple flasher using only four discrete components (Figure 1) . Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria
Flasher/Dimmer Lantern - The electronic lantern control circuit adds high-efficiency dimming and flashing to an existing battery-powered lantern or flashlight or to a custom design. For the car it makes a great lamp for changing a flat tire, back seat reading or emergency engine work. The flasher mode __ Designed by Tony van Roon VA3AVR
Flashing / pulsing third brake like for cars - DN15: Flashgun converter
Flashing Beacon - A flashing beacon has many uses. It can be employed as a distress signal on highways or as a direction pointer for parking lots, hospitals, hotels, etc. Here we present a...__ Electronics Projects for You
Flashing Birthday Heart - This circuit was made for my wife's birthday. It is capable of flashing five strings of LED's with different frequencies. It also has a connector for an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in musical greeting cards. In this way the circuit will play alternatingly two room filling tunes at regular time intervals. After a w __ Designed by Michel Van den Bergh On Electronics
Flashing Headlight for Mobikes - The dipper for a vehicle’s headlight changes the light from high beam to low beam or vice versa given a particular set of road conditions. The shifting of light from high...__ Electronics Projects for You
Flashing Heart - This circuit was made for my wife's birthday. It is capable of flashing five strings of LED's with different frequencies. It also has a connector for an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in musical greeting cards. In this way the circuit will play alternatingly two room filling tunes at regular time intervals. After a w __ Designed by Michel Van den Bergh On Electronics
Flashing Heart - This circuit was made for my wife's birthday. It is capable of flashing five strings of LED's with different frequencies. It also has a connector for an 8 Ohm loudspeaker and two connectors for the small PCB's that are contained in musical greeting cards. In this way the circuit will play alternatingly two room filling tunes at regular time intervals. After a w __ Designed by Michel Van den Bergh On Electronics
Flashing High Intensity LED 3rd Brake Light - This circuit to make a flashing 3rd brake light assembly was designed to be easy to locate all the needed components and reasonably in expensive to build__ National Semiconductor
Flashing High-Power LED - 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
Flashing Indicators - Need to flash "turn indicators" using a 555 and a single 20 amp relay. Here is our suggestion. The timing resistor needs to be selected for the appropriate flash-rate. __ 555-Timer
Flashing LED - This simple project makes a good low-cost first project to check your soldering skills and learn to identify common components. The LED flashes at about 3Hz (3 flashes per second) . __ Designed by John Hewes
Flashing LED Advertising Badge #1 - I have seen numerous flashing light badges at trade shows and conventions. They are often handed out as gifts to promote some business. The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Hobby Circuit designed by David Johnson P.E.-March, 2002
Flashing LED Power Indicator - This circuit flashes a power indicator LED to keep the average current low. . . Circuit by Dave Johnson P.E.-June, 2000
Flashing LED with PIC12F629 - This is the first example that you should to know how to set output pin. In this example, GPO is set as an output. LED1 will be turn-on when GP0 is set high and LED1 wiil be turn-off when GP0 is set low. This example use 4MHz internal clock.
Flashing LED-Based Solar Engine - Voltage-Controlled Solar Engine:This design uses a flashing LED to determine the solar engine's voltage trip level. __ Designed by Wilf Rigter
Flashing light / emergency beacon for vehicle - No circuit description, schematic only__ CdS Electronic
Flashing Lights for Planes & Helicopters - NOTE
: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Flashing Neon Christmas Lights - One of the bummers of Christmas is trying to get the strings of lights to work. The biggest culprit are the strings that are connected in series. These are usually the strings of so-called miniature Christmas lights with the push-in bulbs. You've probably read on the box that when one light goes out the rest stay lit. True, the light bulbs have an internal "shunting device" so that if one burns out, it doesn't break the circuit and the rest of the lights do stay lit. But the problem is that if the circuit should become broken at any other point, the whole string goes out. The usual place this happens is between the lamp and the socket, especially if the string is used outdoors. This is because water in the socket causes the thin copper lamp wires to oxidize, which prevents them from conducting electricity. Sometimes the wires on the lamp can become completely eaten away. At any rate, it breaks the circuit and the string doesn't work. __ Designed by Colin Pringle colin @ wild-bohemian.com
Flashing Neons (NE-51 / NE-2) - In this circuit, one, two or three neon indicator bulbs can be made to flash in sequence at rates determined by the R and C values. In the single stage circuit, using one lamp, the capacitor charges through the resistor until the ionization potential of the neon is reached (about 70 volts) and __ Designed by Bill Bowden
Flashing Railroad Lights - This circuit flashes two red LEDs for a model railway crossing. __ 555-Timer
Flashing Red LED Light-1970's Style Caboose Marker - A circuit that drives a red LED from a 1.5 volt battery and simulates an incandescent light. Duty cycle can be changed by selecting resistor values __ Designed by Dick Cappels
Flashing/Pulsing third Brake lite for cars - Several years ago these flashers were introduced in the automotive industry as part of the third brake light and contained strobe lights (and strobing continuously for the duration of pressing the break pedal) but got abandoned almost immediately sometime later because of the 'strobe' effect it has on some people. This circuit has become obsolet since much better circuits are available these days without the 'lag' in between brakes caused by R4 and C3. One of the circuits is listed below __ Designed by Tony van Roon VA3AVR
Flashing-Cum-Running Light - This circuit generates flashing lights in running pattern. In conventional running lights, the LEDs glow one by one. In this circuit, the LEDs flash a number of times one by one.The...__ Electronics Projects for You
Flashing-LED Battery-status Indicator - Signals when an on-circuit battery is exhausted; 5V to 12V operating voltage __ Contact: Flavio Dellepiane, fladello @ tin.it
Fleapower Flasher Draws Less Than 50 µA - 01/23/03 EDN-Design Ideas Frequency source feeds entire labSome applications require a circuit to indicate that a battery's voltage has fallen below a certain value. However, if you don't frequently check the indicator, the low-battery indicator itself can easily discharge the battery. The circuit in Figure 1 indicates when the battery voltage has dropped below a preset value Design by Gary Butterfield, IEC Electronics Technology Center, Newark, NY
Flicker Lamp - Having bought a cute little ‘paraffin lamp’ from a cut price shop, I decided to make it a little more interesting. Its battery powered of course but its continuous shine and simple on / off ‘wick control’ did not make for anything like a close simulation of the real thing. So, I replaced the on / off control with a variable potentiometer and I added flicker! __ Contact: Karen's Microprocessor Projects
Flickering Fire Effect - This simple circuit uses four low-Wattage colored bulbs and four fluorescent lamp starters to make nice flickering flame effect
Flickering Lights - Halloween flickering lights __ Designed by Wolf Stone
Flip Flop - In this project we examine one of the most valuable circuits to be invented, the flip flop. Originally it was designed with VALVES, along with its simpler version (without the two capacitors, called a bi-stable Multivibrator) , it was realised it __ Contact: Colin Mitchelltalking @ tpg.com.au
Flip Flop Flashers Buzzers Etc - Several circuits here. The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with the LEDs in the emitters instead of collectors as is normally done. The bias resistors are directly connected __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Fluorescent Inverter - This is a low-cost project for 20 or 40 watt fluorescent tubes. However the most efficient is to use a 40 watt tube (or two 20 watt tubes in series) . It's a circuit you can put together from junk box components or build from a kit. It's very simple to build and requires no printed circuit board __ Contact: Colin Mitchelltalking @ tpg.com.au
Fluorescent Lamp Driver-12VDC - This fluorescent lamp driver uses a normal 120 to 6V step-down transformer in reverse to step12V to about350-Volt to drive a lamp without need to warm filaments. __ Designed by Aaron Cake
Fluorescent Lamp Intensity Modulator - This hobby circuit was designed to experiment with using small fluorescent lamps as a broad pattern source of modulated light. This hobby circuit hits the small lamp with narrow 1us pulses at a rate of 10KHz. Each pulse launches about 10 watts of visible light. The lamp starting method is a bit crude but the circuit does work. . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Fluorescent Lamp Inverter - This inverter is very easy to construct, reliable, and even powerful enough to light up a 15W florescent tube (if you cool your transistor well) . The only hard-to-find piece of this baby is the so-called yellow inverter transformer. It's a miniature high frequency transformer that has a 25mm x 20mm x 5mm ferrite core, 30 turns of primary, 15 turns of feedback, and 250 turns of secondary all concentric, wound on plastic frame than wrapped with a 'yellow' adhesive tape. If you can't find it in your local electronic shops then search for old portable rechargeble florescent lanterns since they have at least one yellow inverter. Of course you can wind a handmade transformer which would do the same but it is a very difficult task when you don't have an original to inspire and it will still need an appropriate ferrite core.
Fluorescent Lamp Night Light Needs Only 1 Watt - If you are tired of replacing small night light lamps, try this circuit. The line powered circuit uses a long life cold cathode fluorescent lamp. A simple charge pump technique runs the lamp without any transformer . . . Hobby Circuit designed by Dave Johnson P.E.-March, 1999
Fluorescent Light - How to build a 4-Watts Fluorescent light using a disposable camera, powered by one 1.5 Volts battery. __ Designed by Jose Pino
Form Fast, Portable Light Pulser - 10/16/03 EDN-Design Ideas The absence of a fast one-shot multivibrator in the entire TTL family, as well as the low-voltage swing and unwieldy supply requirements of ECL, drove us to exploit the fast transition times and low propagation delays of F-series g Design by SK Kaul and IK Kaul, Bhabha Atomic Research Centre, Trombay, Mumbai, India |
