Tindie Weblog | DSP AM/FM Radio Package


As an newbie radio operator (and even effectively earlier than that) I’ve at all times had a mushy spot for radio. It’s such a tremendous expertise, and I’ve at all times had numerous radios and radio kits round. This DSP-based Twin Band AM/FM Radio is a really nifty little challenge that explores the digital realm of recent radio.

The challenge is predicated across the Skyworks (previously Silicon Labs) SI4730 chip. This chip integrates all the pieces wanted for a contemporary radio, from the front-end amplifier and mixer blocks to the DSP decoder and digital/analog audio outputs. It’s fairly unimaginable {that a} QFN20 chip can include a complete AM/FM radio when within the not-too-distant previous it required many discrete semiconductors, op-amps, mixers, variable capacitors, and extra. Now you get very high-quality audio, all managed through both I2C or SPI-like interfaces.

This equipment takes that chip and pairs it with a rotary encoder & buttons, a 0.96″ OLED display, and exterior antenna and speaker connections. The speaker output has an LM386 amplifier offering as much as 1W of output, which is lots for a small system like this. The system additionally makes use of an ATmega328P, so you may simply modify the firmware to discover all of the options of the Si4730.

If you wish to discover the world of short- and longwave, JasonKits additionally sells the same equipment primarily based across the Si4375 Quad Band AM/FM/SW/LW chip. The most recent revision has some fancy new options, together with a 17dB pre-amp on the shortwave enter, permitting weaker stations to be tuned in additional reliably.

Dive into the world of digital radio with one in all these superior kits!

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