That is the 8 step sequencer for the Paper-Bits. One can change steps, speed and the value of the CV output. The speed can be voltage controlled, too. There are also 8 banks for storing notes and rhythm.
The board is based on an Arduino chip and therefore can be easily programed and modified.

pb201_stepsequenzer_15.ai.zip

• Resistors:
• 8x 220 Ohm
• 3x 10 kOhm
• 2x 1 kOhm
• Capacitors:
• 2x 22 pF (ceramic)
• 3x 100 nF (foil)
• 1x 1 nF (foil)
• 1x 10 µF ELKO
• Diodes:
• 8x LEDs 3mm
• Crystal:
• 1x 16 Mhz
• IC:
• Atmega328P-PU
• Mechanical:
• 1x 28pin IC socket
• 1x pin header 1×15
• 1x pin header, female 90° 1×5
• 1x pin header, male 90° 1×5
• 9x push buttons (2 pins)
• 1x mini switch
• 3x jumpers
• Potentiometers:
• 3x 10k

Once you're board is ready, you will need to burn the arduino UNO bootloader on the chip (some chips are already burned from factory).
Follow the instructions:
burn the bootloader

Insert the chip into the IC socket and connect it to you're computer using a USB to Serial board.
breakout board
more about arduino pro mini
Or use your Arduino for that:
http://paperpcb.dernulleffekt.de/doku.php?id=arduino_clones:serial_adapter

Open the Arduino software on your computer and upload the following code to the board: step_test_programm_01.zip
That is a test program to check if the voltage devider for the switch and the step poti has the right value. If the program shows the right values copy-paste that into the sequencer program and upload that to your board, too.
paperbits_stepsequenzer_43.zip

and voila!

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