An ESP32-based internet radio streamer #ESP32 @ddimitr

Dimitris has taken an unused ESP32 board and fashioned an I2S streaming internet radio.

I hooked up a tiny DAC board that I had lying around (sporting an ES9023 chip – very practical since the ESP32 does not output an MCLK signal), and the thing worked flawlessly on the first try!

So I thought that I should do a carrier board for the ESP32 that would perform the following:

  1. Host the ESP32 board,
  2. Provide regulated power to the ESP32,
  3. Provide headers for serial port (programming), SD card, extra I/O, and perhaps for an LCD,
  4. Do galvanic isolation of the I2S signals,
  5. Provide buffered I2S output for connecting to an outboard DAC board,
  6. Have an on-board DAC with line level outputs.

Since this device would only stream internet radio (a.k.a. “heavily compressed audio”), the on-board DAC did not have to be anything special. So let’s go with the all time classic ES9023.

Let’s also do a relatively good power supply for the critical component (dac chip) but nothing extreme. The rest of the audio-related components can be powered by well respected LP5907 LDOs, while the actual ESP32 can be powered by a run-of-the-mill LM1117.

See the design and the project in the post here.

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1 Comment

  1. I can read resistor color code all day!

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