Full musical keyboard using only discrete logic chips
Here’s another elegant project submitted to the Open 7400 contest. This project is about constructing an electronic music player with a capability of playing real chords, which means you can press more than one key at a time and each key has got its own frequency generator circuit. The design consists of twelve 4060 oscillator/counter ICs used as tone generators, a dsPIC for sound effect and control, and an LM386 audio amplifiers.
DIY musical keyboard