I picked up a $10 blue toy megaphone/voice changer. It comes with 5 switches down the site to choose different voice changin effects.
After removing the PCB from the plastic case, replacing the microphone with a 1/4″ in, and the speaker with a 1/4″ out. Removing all the plastic switches, drilling out the holes, replacing with metal toggle switches. Finding a way to rewire the LED’s that show the audion level. Finding a way to supress the op/amp chip with a giant resistor so it doesn’t increase the volume 10 times. All I needed to do was stick it in a temp hardboard panel and mount it in my eurorack.
I rather like the effects, they really are very nasty.
It would be great if the intensity of each effect was controllable with a knob, but I tried and nothing seemed to work.
It would be great if the toggles could also be fired with CV triggers, but I have no idea where to start.
So for now, this is it.
I’ll find a link to the actual megaphone and will post here soon.
There’s a picture on the right of what I started with, it’s not my picture, just one I found on flickr that was the same.
Initial Inspiration came from Casper Electronics