# UTIL-002 Advanced Keys

Unfortunately the exact history of this module at the beginning is a little obscure as the original repository was lost in the 2025 NAS data loss accident. The early history of the module I am going to provide from clues I left in the board layout + memory.

This board is a clone of Ray Wilson's 1v/oct keyboard from MFOS. I like the design because it seems simple and easy enough for a beginner trying to make a DIY synth. Regretably, a few or the parts from the original design are obsolete, so rev. 1.1 is a slightly modified design that will hopefully work in practice.

The module comes in two parts (and two separate PCBs): the main module and the key module. The main module has a constant current supply which is sent out to the key module, and then all the required electronics to measure the voltage returned from the key module, scale it to 1v/oct, and generate the gate/trigger signals. The key module contains the keys themselves and the resistor divider chain. Multiple key modules can be chained together so long as the last one in the chain has the required jumper placed. (Note that with more than 3 or 4 key modules chained together the v/oct tracking is going to suffer.)

Future modifications can be made to this design to add different keyboard styles, pedalboards, or even unique inputs for playing the synthesizer.

## Revision List
**Rev 1.0** - June 2023
- Created the schematic and PCB layout based on Ray Wilson's design
- Created PDFs of the schematic
- Generated the GERBER outputs to send for fabrication
- Generated a list of materials and bought most of the parts

**Rev 1.0b** - December 2025
- Used the Interactive HTML BOM plugin the generate an interactive HTML BOM.
NOTE: This version is part of Rev. 1.0 because I suck at version control. Sorry.

**Rev. 1.1** - December 2025
- Replaced 2N5457 with J113 since the original part is now obsolete.

## TODO List/Future Features
- Finish assembling the board and test it