50
edits
final
No edit summary |
(final) |
||
| Line 147: | Line 147: | ||
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. | 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. * | 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. | 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. | ||
At the end, I putted the bended circuit in a happy meal plastic book and installed all the necessary components in the book casing. I also added two screws to be able to push the buttons from outside, when the book case is closed. | [[File:Case front with drilled holes.png|thumb|case front with drilled holes]] | ||
At the end, I putted the bended circuit in a happy meal plastic book and installed all the necessary components in the book casing. I also added two screws to be able to push the buttons from outside, when the book case is closed.[[File:Install in book case with battery pack.png|left|thumb|install in case]] | |||
[[File:Headphone jack.png|thumb|headphone jack]] | |||
The most important modification was also to add a 3.5mm headphone jack to the toy/instrument/machine and a small Potentiometer as a Volume control, when its hooked up to a amplifier or if you use it with headphones, its the small yellow thing. | |||
[[File:Volume pot.png|left|thumb|volume pot]] | |||
<nowiki>*</nowiki>If you record something in the pitched up state, with your finger pressed on the open contacts and then remove them, it will be pitched down. | <nowiki>*</nowiki>If you record something in the pitched up state, with your finger pressed on the open contacts and then remove them, it will be pitched down. | ||
If you make a really short recording and keep the play button pushed down, it will loop the playback. | If you make a really short recording and keep the play button pushed down, it will loop the playback. | ||
[[File: | [[File:Video The book of repetitions.mp4|left|thumb|Video The book of repetitions]] | ||