This is power battery saver circuit using an IC-555 timer. The lamp is controlled with a PWM mode by adjusting of potentiometer VR1. And, PNP power transistor drives a lamp. Sometimes…
IC-555 timer is an integrated circuit used for timer, pulse, oscillator application. They can be used to the time delays, flip-flop. They have 8 pins so easy, and small circuits.
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Simple DC to DC converter using 555 timer IC. You can build easily it.
Here are LED light sequencer circuit that using IC-4017 and IC-555.