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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:
Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :
  • 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.
  • 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.

  • 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...
  • 3 Volt Low Battery Voltage Flasher
    This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment.  It use an inexpensive IC from Panasonic that is connected to an efficient LED flashing circuit.  When the battery voltage drops below a certain point the circuit flashes the LED.  In the off state the circuit draws only 1uA, while in the active flashing state it draws 20uA.   Published in EDN, Jan 2, 1997


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1.5 Volt LED Flashers (Bowden) -  The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre De-Guerin illustrates using a 100uF capacitor to double the battery voltage to obtain 3 volts for the LED. Two sections of a 74HC04 hex inverter are used as a squarewave oscillator that establishes the flash rate while a third section is used as a buffer that charges the capacitor in series with a 470..... [by Bill Bowden]
1.5V LED Flasher - schematic only, no description provided as this time...[Circuit designed by Andrew R. Morris]
1.5V LED Flasher Oscillator -  The following table shows the features of several LED flasher circuits obtained by changing C or R parts (drawn in red color in the diagram) and voltage supply. The LED (D) should be preferably of the red type. .(electronic schematic added 11/08)
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. . [Hobby Corner Circuit by Dave Johnson]
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..... [Designed by David A. Johnson]
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...[Designed by David A. Johnson]
3 Volt Low Battery Voltage Flasher
This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment.  It use an inexpensive IC from Panasonic that is connected to an efficient LED flashing circuit.  When the battery voltage drops below a certain point the circuit flashes the LED.  In the off state the circuit draws only 1uA, while in the active flashing state it draws 20uA.   Published in EDN, Jan 2, 1997 [Designed by David A. Johnson]
10 Stage LED Sequencer (Bowden) -  The 4017 is a CMOS decade counter with 10 decoded outputs.  Inputs include a clock (pin 14), a reset (pin 15), and a clock inhibit (pin 13).(design added 5?09)
10 Stage Light Sequencer -  flashes10 low voltage bulbs, operates at10-25-Volt voltage, in PDF format, text in Finnish (added 4/02)
10 to 100 LED Sequencer Using a Matrix  -  The circuit above illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20 transistors. The two 4017 decade counters control the 10 rows and 10 columns so that one LED is selected depending on the output of the decade counters. The LED circuit is drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100..... [Bill Bowden's website]
11 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.....(electronic design added 09/08)
11 LED Sequencer -  in PDF format, text in Finnish (added 4/02)

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Light Flashers:  #'s        A - C        D - F        G - K       L       M - R      S     T - Z


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