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Pi Pico Rx – A crystal radio for the digital age?
- A crystal radio for the digital age?¶ My first step into the world of electronics was with a crystal radio, just like this one. Back then, I don’t think it has ever occurred to me that I could make a radio myself, so I wasn’t expecting it to work.
Armed with just a Raspberry Pi Pico, an analogue switch, and an op-amp, we now have the power to construct a capable SDR receiver covering the LW, MW, and SW bands. Continuing in the spirit of knowledge sharing, I have attempted to describe the finer details of the hardware and software in this wiki, starting here with an overview of the new features introduced by the Pi Pico Rx that I haven’t seen before in other designs. In this design, the select inputs to the analogue switch are driven directly by the Raspberry Pi Pico, the PIO feature of the RP2040 is capable of generating a quadrature oscillator at frequencies up to 30MHz without software intervention.
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