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Amadeus board

A double YM2149 synth with USB and MIDI capabilities

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The aim of this project is to be able to make it easy for non musically talented people (like me) to play some awesome tunes on the classic YM2149 music generator IC from the 70s/80s.

After some prototyping this summer with one AY-3-8910 attached to an Arduino I found out that the 3 channels that come inside one of these ICs was not enough (at least for me), and so I bought another one (this time two YM2149) and connected them together to an Arduino. This not only worked, but also sounded nicely !

So then was the last step, to make it standalone (i.e. stop using breadboards and cables) and make it permanent... And so, after adding some improvements, like an amplifier and a MIDI input, the Amadeus board was born !

Latest test: https://youtu.be/0bw5y5ODUXc (in this video we're able to see the contents of the registers of each of the 3 channels of each of the 2 ICs).

Image explanation: The first image shows an Amadeus board with the MIDI connector but not the USB.
  • 1 × ATmega328p Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
  • 2 × YM2149 / AY-3-8910 Sound chip
  • 1 × CH340G USB UART connection
  • 1 × 6N137 Opto and Fiber Optic Semiconductors and ICs / Optocouplers and Optoisolators
  • 1 × LM358 Amplifier and Linear ICs / Operational Amplifiers

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