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1.5v One Battery LED Light Flasher Circuit Diagram

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

PARTS LIST R1 100kΩ R2 1kΩ R3 47Ω R4 10kΩ C1 0.01µF (103) C2 10µF C3 100µF Q1 BC547 Q2 BC557 D1 LED BT1 1.2V 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.









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