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Small green circuit board with 3.5mm audio jack and pin headers

ProTechTrader

ProTechTrader PTT-Si4703 FM Tuner Breakout Board V13

SKU CH-BBVE-ZXVNC

FM radio breakout covering 76–108 MHz with RDS/RBDS decoding, 3.3 V I²C or 3-wire interface, 3.5 mm jack uses headphone cable as antenna

  • Drop-in replacement for SparkFun WRL-12938 V13 with identical pinout
  • FM reception across 76–108 MHz at 3.3 V operating voltage
  • RDS and RBDS data decoding built into the Si4703 chip
  • I²C interface up to 400 kHz plus 3-wire option up to 2.5 MHz
  • Headphone cable acts as antenna — no external antenna required

Purpose and Compatibility

The ProTechTrader PTT-Si4703 is a development board that adds FM radio reception to microcontroller projects. It serves as a pin-compatible replacement for the SparkFun WRL-12938 V13 board and is referenced in the Make: Radio educational book. Makers and students can use it with 3.3V Arduino, Raspberry Pi, AVR or ARM platforms to experiment with broadcast radio.

Radio Reception and Power

The Si4703 chip tunes the 76 to 108MHz FM band and processes both RDS and RBDS data signals. The module operates at 3.3V and communicates via a two-wire I2C interface at up to 400KHz or an optional three-wire system at up to 2.5MHz. Programmable de-emphasis supports 50µs and 70µs standards for regional broadcast compliance.

Connections and Daily Use

A 3.5mm audio jack provides the output; inserting headphones or a cable longer than three feet uses the lead as the antenna, so no external aerial is required. The board matches the V13 pinout with GND, 3.3V, SDIO, SCLK, SEN, RST, GPIO1 and GPIO2, though headers are not soldered. Note that the V13 layout swaps the 3.3V and GND positions compared to the older V11 WRL-10663 design.

Highlights

  • Drop-in replacement for SparkFun WRL-12938 V13 with identical pinout
  • FM reception across 76–108 MHz at 3.3 V operating voltage
  • RDS and RBDS data decoding built into the Si4703 chip
  • I²C interface up to 400 kHz plus 3-wire option up to 2.5 MHz
  • Headphone cable acts as antenna — no external antenna required

Specifications

BrandProTechTrader
ModelPTT-Si4703
Part NumberPTT-Si4703

Questions about this item

How do I solder the header pins onto the PTT-Si4703 V13 breakout board and connect it to a 3.3V microcontroller?

Solder the supplied header pins to the board, then wire GND, 3.3V, SDIO, SCLK, SEN, RST, GP101 and GP102 to matching 3.3V logic pins on your Arduino or Raspberry Pi; note that the V13 layout swaps the 3.3V and GND positions compared to the older V11 board.

What ongoing care does the Si4703 FM tuner module require after installation?

No periodic maintenance is needed; the board has no moving parts or consumable components, so only re-solder any header joints that become loose over time.

At what point does the 3.5mm headphone cable stop working as an effective antenna for the 76–108MHz FM band?

The cable must be longer than 3 feet to act as a sufficient antenna; shorter cables or no headphones connected will cause reception to degrade first during sustained listening.

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