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digital-fm-radio-94b8fd-en.md

Retro Tech: Arduino Format Digital FM Radio

While streaming internet radio gets all the glory, there is still something magical about pulling invisible analog radio waves out of the air. The Digital FM Radio project uses the I2C protocol to command a specialized silicon tuner chip.

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The TEA5767 Radio Module

The heart of this build is the TEA5767.

  • It is a miniature FM stereo radio receiver on a single chip.
  • Instead of manually turning a tuning capacitor, the Arduino uses the Wire.h library (I2C) to send specific frequencies directly to the chip.
  • Example: The user turns a rotary encoder. The Arduino calculates the new frequency (99.5 MHz), converts it to the specific binary format the TEA5767 requires, and transmits it over I2C. The chip instantly locks onto that station.

The Audio Path

The TEA5767 does not output enough power to drive a speaker.

  1. The audio signal is sent out through its Headphone/Line-Out pins.
  2. It must be routed into an Audio Amplifier module (like the PAM8403 or LM386).
  3. The Amplifier boosts the signal and pushes it out to a 3W or 5W speaker.

The Interface

  • Arduino Uno/Nano: The tuner controller.
  • TEA5767 Module.
  • 16x2 LCD or OLED Screen: To display the current station (e.g., "FM: 104.30 MHz").
  • Rotary Encoder: The perfect digital dial for scrolling through frequencies.
  • Telescopic Antenna: Essential for pulling in clear signals from distant towers.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Digital FM Radio"
description: "Tune in! Construct a fully functional digital FM radio receiver using a TEA5767 module, an audio amplifier, and a station display."
category: "Audio & Sound"
difficulty: "Intermediate"