For audio, it uses a VS1053 MP3 decoder, PAM8403 amplifier, and a wideband speaker, with an audio isolation transformer to clean up the audio. To reduce power consumption, a MOSFET cuts power to ...

A 4-bit microprocessor in .Verilog capable of multiplying two 4-bit unsigned integers via Shift-and-Add using a custom 16-instruction ISA - kierancyh/4-bit-Microprocessor ...