This is a hardware project for Ka-Radio.
It is based on ESP8266 chip and audio codec VS1053b chip.
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You can power it with 3V3 or 5V. Do NOT use both power inputs at the same time.
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You can connect an external keypad for control. Just unsolder the ADC jumper.
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The RXD pin is 5V tolerant so you can connect a 5V microcontroller.
It's official! ESP8266 I/Os are 5V tolerant. -
Output is line-out with large audio grade electrolytic capacitors. Safe to connect an external amplifier.
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You can use two types of SRAM. 23LCV1024 or 23LC1024. Just solder the proper jumper.
Tested and working as expected.
You can order the pcb from OSH Park.