Picture of Hack a voice changer to add an Arduino input
Another quick hack. I purchased a voice changer because I was looking for something cheap that could be hacked into an voice input device. Basically I wanted to animate a skull when I spoke. Added bonus, now the skull puppet would also have a scary voice.
I am going to show you how to hack a voice changer to use as a digital input for an Arduino project. I leave the output or reaction up to you.
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Step 1: What you'll need

Picture of What you'll need
I am assuming that you have a little bit of electronics and soldering experience. I will also assume that you have some familiarity with Arduino.

You will need
  •  A voice changer module. (8$ at Wallymart)
  •  A 741 opamp ic.
  • an LED of choice (not necessary, but provides a cute little visual input that things are working, and will provide clues as to how to change the circuit into a LED light organ.)
  • a resistor for your led (220 ohms - 1 k will work alright, you only need this if you are using the LED)
  • some hookup wire.


  • Soldering iron and solder
  • wire snips

Step 2: Open 'er up

Picture of Open 'er up
First things first, crack the case. Not literally, just figuratively. Open it carefully with a screwdriver, save your screws.

Start by removing the battery cover and batteries as there are two screws hiding under the batteries.

Flip the unit over and remove the other two long screws. You can leave the belt clip intact. The two short screws can be left in even though I didn't. They hold the switch in position and removing them will only mean that you will need to line it up again later. Learn from my mistakes and leave them in.

There, four screws out (plus one for the battery cover) and you should be able to look inside.
Kind of exciting eh.
tkelley122 months ago
Could I use the arduino to add in a new distortion for the voice?
fjordcarver (author)  blinkyblinky3 years ago
Big place, usually has a Mark Donald's restaurant inside.
fjordcarver (author)  blinkyblinky3 years ago
I don't like advertising, is it poor Instructables form to use the wrong names? I figured it would be clear enough. Sorry for the confusion.
I'm joking around but it may be confusing to others.