DIY sound synthesizer “Tokarev Protosynth T32“ stm32

A demo of my personal DIY synthesizer with sequencer design, called Tokarev Protosynth V1. Its based on the STM32F103 32 bit microcontroller. Output is done through a timer PWM output with a 4th order analog lowpass active filter realised on LM358 opamp. Cheers!