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SD Audio Player with ATTiny
This is a simple SD audio player biult with only an 8-pin microcontroller (ATTiny85).
A minimalistic design: WAV player, which can play stereo WAV from SD card using the 8-pin ATTiny's PWM outputs. Author says: 8-pin AVR microcontroller has two fast PWM outputs in 250kHz carrier frequency. This enables to output a wide frequency range audio signal. I built an audio player with the 8-pin AVR and an SD memory card (SDC). The SDC can be controled with only six lines, two for power supply and four for control signals.
Read more: Simple SD Audio player