JFET

525Radio

Overview

This solution is an FM radio station designed using GFT809. It is very simple and can be controlled without writing a program.

Bilibili demonstration video: https://www.bilibili.com/video/BV17S4y197vL/

The module pins and its application circuit are shown in the figure below:

Use a 3.3V DC power supply. It is best to connect a capacitor in series to the headphone end. The crystal oscillator is recommended to be 21.25MHz. The crystal oscillator frequency will directly affect the FM transmission frequency.

The FM transmit frequency has level control on the five pins Band D0 D1 D2 D3. The frequency can be adjusted by pulling up and down on these pins. As shown in the following table:

Here I use DIP switches to adjust the voltage of these pins. The rendering is as shown below:

Just weld a metal wire to the antenna part. To achieve better results, it is recommended to add a matching circuit to the antenna end. Please refer to the figure below:

The finished product is shown in the picture below:

The demonstration video can be searched on station B: I am Teacher Peng

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-23 10:46:18

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