The LED flasher circuits beneath work on a solitary 1.5 volt battery.
The upper circuit, shows utilizing a 100uF capacitor to twofold the battery voltage to get 3 volts for the LED. Two segments of a 74HC04 hex inverter are utilized as a squarewave oscillator that builds up the glimmer rate while a third segment is utilized as a cushion that charges the capacitor in arrangement with a 470 ohm resistor while the support yield is at +1.5 volts. At the point when the cushion yield changes to ground (zero volts) the charged capacitor is put in arrangement with the LED and the battery which supplies enough voltage to light up the Drove. The LED current is more or less 3 Mama, so a high brilliance Drove is suggested.
In the other circuit, the same voltage multiplying standard is utilized with the expansion of a transistor to permit the capacitor to release speedier and supply a more noteworthy current (around 40 Mama crest). A bigger capacitor (1000uF) in arrangement with a 33 ohm resistor would expand the glimmer length of time to around 50mS. The discrete 3 transistor circuit at the lower right would require a resistor (around 5K) in arrangement with the 1uF capacitor to broaden the beat width.