网络电台问世已约四分之一世纪，廉价联网微控制器的普及让自制网络电台变得前所未有地容易。但究竟能做得多小？[Milen] 在 Instructables 上分享了一台小到罕见的网络收音机。
硬件方案很直接：取一颗微控制器连上网络，再用网络电台软件把音频输出给 DAC。本例中微控制器是焊在一块极小开发板上的 ESP32-C3，外挂一块带 PCM5102A I2S DAC 与放大器的定制 PCB。整体极其袖珍，连两个连接器相对机身都显得很大。
它是否称得上“实用听音设备”还有待验证，但确实足够小。作者也抛出问题：能否做得更小？放弃连接器或许是个轻松的取胜点；退一步用 ESP 内置（本非为音频设计但可用）的 DAC 也能换得体积。欢迎读者贡献更极致的想法。
本文来源：https://hackaday.com/2026/10/02/is-this-the-smallest-internet-radio/
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Internet radio has been around for roughly a quarter century, and the spread of cheap networked microcontrollers has made DIY internet radio easier than ever. But how small can it get? [Milen] shared on Instructables an internet radio that is unusually tiny.
The hardware approach is straightforward: take a microcontroller, connect it to the network, and run internet radio software that outputs audio to a DAC. In this build the microcontroller is an ESP32-C3 soldered onto a very small development board, paired with a custom PCB carrying a PCM5102A I2S DAC and amplifier. The whole thing is extremely compact — the two connectors look large relative to the body.
Whether it deserves to be called a 'practical listening device' remains to be proven, but it is certainly small enough. The author also raises a question: could it be made even smaller? Dropping the connectors might be an easy win; stepping back and using the ESP's built-in DAC (not designed for audio, but usable) would also trade down in size. Readers are invited to contribute more extreme ideas.
