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Light Flasher
Circuits Page 1
Light Flashers:
#'s A - C
D - F
G - K
L
M - R
S T - Z
Last Updated on:
Friday, March 12, 2010 12:07 PM |
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Circuits Designed by Dave Johnson, P.E. : |
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1.5V LED FLASHER VERSION A
Many published circuits that flash LEDs need 3 volts or more. This circuit uses
only a single inexpensive C-MOS IC and flashes the LED for a full year on a single
1.5 volt AA alkaline battery cell. The circuit uses a charge pump technique to
provide the LED the needed voltage.
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- 1.5V
LED FLASHER VERSION B
To squeeze even more energy from a alkaline battery cell, this circuit adds two
transistors to a circuit similar to the above design to boost the efficiency. A
small 1.5 volt alkaline N cell should flash the LED for a full year. It too uses a
"charge pump" technique to provide a LED the needed voltage.
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3v Low Battery
Voltage Flasher
Many battery powered devices use two AA alkaline cells. Often you will not
know when it is time to replace the batteries until the device powered by them
actually stops operating. The hobby circuit below can be connected to a 3v
battery, to give you some warning when the battery is nearing its end of life.
It will flash a LED when the battery voltage drops to about 2.4 volts. The
electronic circuit draws only 1ua of current in standby mode and jumps to only 20ua
when flashing, so it can safely...
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- Super
Bright 3v Powered LED Flasher
I have posted several kinds of LED flashers
over the years. This is yet one more flasher, designed to flash any high power
LED of any color. It hits the LED with a 25ms 250ma pulse once every 2
seconds. This works out to an average current about 3ma. It is powered
by any 3v source. I suggest two AA cells but a single 3v lithium coin type
cell will also work. With fresh AA cells, the light should flash for about two
weeks. The light flash is very intense and is perfect for any attention
getting night time application.....
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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1.5 Volt LED Flashers #1: four circuits with description (added 4/02) |
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10 Channel LED Sequencer: based on4017 (added 4/02) |
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10 LED Sequencer: in PDF format, text in Finnish (added 4/02) |
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10 Stage Light Sequencer: flashes10 low voltage bulbs, operates at10-25-Volt
voltage, in PDF format, text in Finnish (added 4/02) |
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12 Stage Neon Sequencer (NE 2/NE 51): uses small power 70-Volt neon bulbs (added
4/02) |
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12 Volt Strobe Circuit: this circuit uses12V DC instead od mains AC. This is
very good idea if you don't want to mess with direct mains voltage connected circuit or
you want to run Strobe from batteries. (added 4/02) |
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120 VAC
Lamp Chaser using Solid State Relays: (circuit / schematic design added 6/06) |
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120 Volt AC Lamp Chaser using Solid State Relays: This circuit is similar to
LED clock using12 neon indicator lamps instead of LEDs. It operates from2 high capacity ni-cad
cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for
neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger
Squarewave oscillator, high voltage switching transistor, and10 mH high Q inductor. Most
any small PNP transistors can be used that have a C/E voltage rating of 80 or more. (added
4/02) |
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16 Stage BiDirectional LED Sequencer: (circuit added 7/02) |
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18 Stage LED Sequencer: (circuit / schematic design added 6/06) |
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Transistor 2 LED Flasher: (circuit / schematic design added 6/06) |
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2 Transistor LED Flasher #1: (circuit added 7/02) |
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2 Transistor LED Flasher #2: (electronic design added 9/02) |
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2 Wire Lamp Flasher: Ideal to operate3 to24 Volt DC existing on-Circuit lamps
LED operation is also possible (added 9/04) |
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220 Volts Flashing Lamps: Especially designed for Christmas tree lamps to
replace old rmally-activated switches (added 9/04)) |
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2-wire Lamp Flasher: This circuit has been designed to provide that continuous
light lamps already wired into a circuit, become flashing. Simply insert circuit
between existing lamp and negative supply. Especially suited for car or panel pilot
lights, this device can drive lamps up to 10W.... (design added 11/06) |
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3rd Brake Light Pulser: (electronic diagram added 6/03) |
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3 Xenon flashing circuits found in flash for disposable cameras: (electronic schematic
/ circuit added 05/07) |
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40 LED Bicycle Light (555 Timer 6 Volt): (circuit added 7/02) |
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8 Random Flashing LEDs: This project flashes eight LEDs in an apparently random
manner. It uses a 4060 combined counter and display driver IC which is designed for
driving 7-segment LED displays. The sequence is not really random because seven of
LEDs would normally be display segments, eighth LED is driven by an output
that is normally used for driving furr counters. The table below shows sequence for
LEDs. You can use less than eight LEDs if you wish and table may help you decide
which ones to use for your purpose. (added 09/05) |
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Light Flashers: #'s
A - C
D - F
G - K
L
M - R
S T - Z |
