The 555 timer IC is a handful of active components all baked into one beautifully useful 8 pin package. Originally designed for timing purposes, they became ubiquitous parts that can achieve almost… ...

There are a multitude of PWM circuits that you can build with the 555 timer. The key external hardware consists of the potentiometer (R3), two diodes (D1–D2), and one capacitor (C2). For the novice, a ...

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.