Paper Bits is a small, modular synthesiser system voltage controlled, created by Wolfgang Spahn at the Indian Sonic Research Organization with support of Goethe-Institut Max Mueller Bhavan. And with further elaboration in collaboration with Angelo Thomaz and Ioana Vreme Moser. Its simple design, accessible interface as well low price, offer a powerful sound tool dedicated to learning, experimenting, and playing.

Currently, there are 19 modules online that can be put together in different ways and patched. However the system is growing and changing as we are currently working on it.


Here you find the “stl” files for the Paper Bit Frames:


All flters and oscillator use the OpAmp LM358. But for a better sound and a better peap to peak range one can use the rail to rail OpAmp MCP6002-I/P or the TLC 2272. And instead of the LM324 the MCP6004-I/P or the TLC2264.





Power and Output


For Developing and Indication

Paper-Bits played by Ioana Vreme Moser

A video posted by Wolfgang Spahn (@wolfgangspahn) on

How to Patch

Paper Bits have two power lines for +5V and the ground and three connectors for the signal, two general busses and one gate bus. Every module several in and outputs. With jumper one can select them to connect the module to the bus or send the signal through without effecting the module or the signal.
All in and output can also be connected via patch cables at the in and output instead of the jumpers.