DIY Relay Oscillator: Building an Electromechanical Flasher with a Relay and a Transistor

When people think of an “oscillator,” their mind usually jumps straight to a 555 timer, a microcontroller blinking an LED, or a quartz crystal. Long before these became the standard approach, electromechanical relay oscillators were a common and elegant solution for generating periodic signals, driving flashers, or switching loads in a repeating cycle. The project […]