The following 1.5V powered LED flasher circuit can flash 1.7V or 2.V LED using 1.5V DC input, depending on the color. The LED will turn on when the 100u capacitor “jacked up” by the BC557 collector. It is a charge pump design. This is where a capacitor (electrolytic) is allowed to charge and is then raised higher and allowed to discharge into a load. The load sees a voltage that can be higher than the supply.

1.5V Powered LED Flasher Circuit Schematic Diagram

1.5V Powered LED Flasher Circuit Schematic Diagram

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