Frederic Schmidt: Difference between revisions

with the potentiometer, you can change the resistance and so the speed (Pitch)  

At the end, i was able to set different speeds with the potentiometers and trigger them with the four buttons.  

I used a tape with recordings of bird voices that sounded very weird but still like birds but different species  

 

if you pitch them up and down and i also used a tape loop with only one Synth sine wave on it that I was able to pitch up and down to a specific tone with the help of a guitar tuner.

For the book of repetitions, I sourced a small PCB of an old children's toy that was used to record and play back ca. 10 sec of sound controlled by two buttons, one to record as long as you hold it down and one to play back the recording function used also a beep sound to indicate start and end of the recording.

To make it more fun, I used a technique called [https://de.wikipedia.org/wiki/Circuit_bending circuit bending]. and did some research on this.  

I found out, that this small PCBs of children's toys, with the ability of playing back sounds (also if they are fixed and not changeable), are using some kind of oscillator as a reference for the playback speed. You'll find it under the black dot on the PCB. I poked around with some wires and soon found the right spot to install a bend. I connected a  small resistor next to the playback circuit to "high" (positive pole) and it resulted in faster playback. I couldn't find a bend to make it slower but I found a other way to pitch down (slow down), wich I'll explain later. *[[File:PCB .png|left|thumb|PCB]]             

Since the "hard wired" connection is only able to make the playback very fast or normal (if not connected), I needed to find a way to get different resistances and one common way to do so is, to simply touch the contacts with your finger. Moving and pressing changes the resistance and also the current that is flowing and at the end the speed of playback and so the pitch. I extended the wires of the bend I found and connected them to a rubber pushbutton where i removed the coating from and scratched the PCB so the copper contact was exposed to touch.  

sometimes its also distorting the sound and there are happy accidents happening sometimes. ;)