|
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 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
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
Fake Alarm Blinker - Get an old used alarm panel with keypad, remove the standard internal electronic board, add this circuit and a 3.6V lipo battery. Push one button for blink, and another button for off. This way you fool stupid people to think you got a real alarm unit installed, so they go some where else and brake in. __ Designed by Thomas Scherrer OZ2CPU
Fake TV Camera Flasher - After having my doorbell rung several times in the middle of the night by some kids, I decided to install some fake TV cameras around the outside of my house. I was not satisfied with the LED lights on the cameras. The heavy current drain of the original circuit meant I would have to replace the battery every few months. So, I removed the original LED driver and added my own simple flashing circuit. . . . Circuit by David Johnson P.E.-August, 2017
Flasher_&_Beeper_for_Well_Pump - Several years ago I installed a box on my water well pump head. At the well head, the solar powered box flashed a very bright LED light and chirped a very load siren, whenever the pump motor was in operation. After many years of service, the box finally became corroded from rain water and died. So, I thought it was time to redesign the circuit and build up a replacement. . . . Hobby Circuit by David Johnson P.E.-June, 2017
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
Fancy LEDS - The idea of this project came from my youngest son. He was dreaming of a small tool able to write symbols or pictures on a screen. As a graphic LCD (even bought at Crownhill :)) was too expensive (or too easy??) , the solution adopted was to pilot a matrix of Leds. This way,
Fantastic Atom Expander - Here is the schematic, PC board pattern, and parts placement for a "Fantastic Atom Expander". This circuit produces an "exploding atom" effect using 98 LEDs. __ Designed by Aaron Cake
Farmhouse Lantern-Cum-Flasher - This circuit uses a dual op-amp IC LM358 and two transistors. It can be powered by a 6V maintenance-free rechargeable battery or a lead-acid accumulator type battery. It has two modes...__ Electronics Projects for You
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
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 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 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 |
