30 Second Light Sabre Autopsy

What we have here. A battery holder, 2 tactile switches, 4 LEDs, and a chip with a blob on that makes a crappy noise. I don't even want to know how the plastic shaft got broken but no ambulances were called. Nothing to salvage or Halloweenify. Let's move on.

LED Dimmer PWM Hack

This cheap dimmer is designed to blink LEDs with a variable duty cycle. The default frequency can be altered by swapping out a single capacitor. 20 kHz makes a whine-free speed control for a DC motor, 1 Hz gives slow PWM for high power resistive heating loads.

Solid State Relay Module

This solid state relay propels a puny logic signal into the big time, switching up to 20 Amps of mains electricity.