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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]] | 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 " | 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. | ||
[[File:Case front with drilled holes.png|thumb|case front with drilled holes]] | [[File:Case front with drilled holes.png|thumb|case front with drilled holes]] | ||