Monophonic Control Voltage Keyboard. The ATKeys module is based on the ATtiny25 microprocessor and generates 60 semitones over 5 octaves as a CV signal, from 0V to 5V with 1V per octave. You can select 2 octaves at a time with the octave potentiometer. The resolution per key is 5V /60keys = 0.083V.
When a key is pressed, a 5V signal is sent to the gate output. This can be switched to a continuous signal using the latch switch.
The device can either be connected directly to the ATPC via the red 3.5mm audio socket or supplied with power using a USB to mini jack adapter and used for an external CV-capable device.



The red TRS jacks uses a special scheme to simultaneously provide 5V as a power source.

This video shows how to connect CV-devices to a former version of the noisio ATPC synthesizer. The functions of the ATBase now are fully integrated into the latest version of the synth and can be selected at startup with mode "Bass Base" (1B):

The AT Keys module comes as a soldering kit or fully assembled.
The kit is easy to build, even for beginners at soldering and was probed and refined on many workshops over the years. Find the positions of the parts under the BOM-link or directly written on the PCB and make sure you've read the tips + general building instructions for noisio kits before you get started: https://www.noisio.de/docs/noisioGeneralSolderInstructions.pdf

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For international customers outside the EU: Import duties, taxes, and all other fees are the responsibility of the recipient.