MAKE Optical Tremolo Box

Projects > MAKE Optical Tremolo Box

Although the concept of an electronic tremolo is decades old, the idea of an optical one is fairly new. Designed by MAKE magazine contributor Sean Michael Ragan, this optical tremolo is novel and customizable take on the classic tremolo circuit. The audio path is completely passive, incorporating only a pot and photoresistor. Power is needed only to run a small DC motor for the tremolo element and an LED.


  • Speed and intensity controls
  • Completely customizable tremolo patterns
  • Runs on 3VDC


  • est. $75 in parts

More Information:

  • View the online article with instructions and explanation
  • View video showing assembly and demo