Image of the Darth Vader voice changer with the mic lying on top. I have to attach the mic to the inside of the Darth Vader mask and I need something to easily lock and unlock the back of the enclosure. The voice changer works excellent and the sound is loud (due to the 2 inch speaker and the box) and resembles Darth Vaders however changing the voice requires opening the enclosure which is far from ideal. Running out of ideas and time I decided to use the regular mini pushbuttons instead that came with the kit. I reconnected the buttons to the kit and again three of them didn't work. I disconnected all four red pushbuttons and tested them on a breadboard with an LED. When I tested the circuit I discovered that three red pushbuttons (see images below) weren't functioning. I soldered all the external components to the Velleman MK171 kit. I finally have finished a prototype but not without problem. About a week ago I wrote about a Darth Vader voice changer that I am making.
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