This tuner circuit is a quick prototype which I build to test the RDA5807M FM radio tuner IC. RDA5807M is a single-chip tuner IC with RDS and MPX decoder, and it equipped with I2C interface for control.

This receiver builds around Atmel's ATmega16A 8-bit MCU. The output stage of this design consists of AN7147N, 2×5.3W audio power amplifier.

Based on the specifications of the switching-regulator and power amplifier, this circuit can drive between 9V to 20V DC input. The most recommended working voltage for this receiver is 12V.

As mentioned above this design is a quick prototype to test the features of RDA5807M tuner. Most of the parameters of this tuner are hardcoded in the firmware and not exposed in UI.

The firmware source codes of this project are released under the terms of the MIT license. All the design files and schematics are released under the terms of the Creative Commons - Attribution 4.0 International license.