Made polyphonic DIY piano with multiple 555 chips | STEMBAY learning center | Stem learning.

Many notes at a time. No expensive MCU or Arduino needed. Yes it is possible to get low noise and sound mixing. However, it is still not rich sound because of the square waves generated. We show you how to build a circuit. Chip with 3 555 timer/oscillator and LM 386 op amp. This is a demo of feasibility and more notes can be easily added.. No need for voltage regulator 7805. Check out minimal chip components. Eliminate unnecessary capacitors. Listen to output examples. STEM subject learning. Learning center for STEM subject. College admission counselor. The next stages of key board making if you stay on analog circuits VCO voltage controlled oscillator if you go to the digital signal processing (DSP) side Teensy MCU and library Music DSP chips such as AY-3-8910, AY3-8912, and SN 76489 References:    • '' 555 based '' polyphonic synth keyboard   Stem school. Stem education.