Simple 1.5V powered LED Flasher circuit diagram

This is a simple 1.5V powered LED Flasher circuit diagram. This circuit can flash 1.7V or 2.3V LED (depend on the color) using 1.5Vdc input. The LED will turn on when the 100u capacitor “jacked up” by the collector of BC557. The circuit 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.

From: http://simpleelectronic.com/2010/06/13/simple-1-5v-powered-led-flasher-circuit-diagram-2/#more-970

LED Matrix Blinking