1. By using the LM555’s reset pin as the input, the timer can serve as a buffer circuit driven by standard logic levels from 1.8 to 5 V. In the inverting configuration, the trigger line is used ...

The electronic circuit is basically a square wave generator using the common LM555 timer IC. ... The actual doubler circuit is made of D1, D2, C4 and C5 components. Advertisement. The 555 dc voltage ...

In this circuit, the renowned timer chip LM555 (IC1) is used as a PWM circuit. The whole circuit can be powered from a standard 12VDC supply, capable of sourcing ample current to the PCB drill motor.