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DIY Hobby projects, diagram, schematic

Electronic Circuits

DIY Hobby projects, diagram, schematic

1.5v One Battery LED Light Flasher Circuit Diagram

electronicecircuits, December 14, 2010August 15, 2023
1.5v One Battery LED Light Flasher Circuit

1.5v One Battery LED Light Flasher Circuit Diagram

This will flash a LED, using a single 1.5V or 1.2V cell.

1.5v One Battery LED Light Flasher Circuit schematic

PARTS LIST
R1100kΩ
R21kΩ
R347Ω
R410kΩ
C10.01µF (103)
C210µF
C3100µF
Q1BC547
Q2BC557
D1LED
BT11.2V or 1.5V Battery

It will even flash a white LED even though this type of LED needs about 3.2V to 3.6V for operation.

Note the R4 in series with LED charges the C3. It does not illuminate the LED. When the two transistors conduct, the collector of the Q2 rises to rail voltage and pulls the C3 high. The negative of the C3 effectively sits on top of the positive rail. All the energy (BT1 + C3) is pumped into the LED to flash.

The circuit takes about 2mA but produces a very bright flash.

You can adjust flash rate changing R1.

1.5v One Battery LED Light Flasher Circuit1.5v One Battery LED Flashlight Circuit Diagram

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Comments (4)

  1. anon says:
    December 17, 2010 at 2:13 am

    Flasher as in a blinky thing?
    I mean, the LED flashes on and off or?

    Reply
  2. pharmacy tech says:
    December 27, 2010 at 8:06 am

    found your site on del.icio.us today and really liked it.. i bookmarked it and will be back to check it out some more later

    Reply
  3. p.Subramaniyam says:
    October 29, 2014 at 4:05 pm

    Good. Am interesting electronic pls send me more

    Reply
  4. Dan Smith says:
    March 26, 2015 at 6:21 am

    Great article, very detailed and good drawing of circuit. Any idea what the total current flow is in between LED flashes?

    Reply

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