# FM DSP PLL radio receiver module, 87–108 MHz with LCD, Campus mode 76–108 MHz, stereo output 2x3W - Page: https://sigmanortec.ro/en/fm-dsp-pll-radio-receiver-module-87108-mhz-with-lcd-campus-mode-76108-mhz-stereo-output-2x3w - Price: 77.59 RON - Availability: In stock; 1-2 zile - Reference: 88308 · EAN: 5949474674896 - Category: Mechatronics and IoT > Sensors and Modules > RF and Radio Modules - Specifications: Supply voltage: 3-5 V DC; Dimensions: 80 x 50 mm; Type: Stereo FM receiver module with DSP and PLL; Interface: UART TTL, 38400 bps; Operating frequency: 87.0-108.0 MHz, mod campus 76.0-108.0 MHz; Output power: 500 mW on headphones, 2 x 3 W on speakers; Power consumption: under 50 mA at minimum volume, up to 400 mA at maximum volume; Display: LCD; Antenna: FM_ANT pad for external antenna, 75 cm rod recommended; Signal-to-noise ratio: minim 30 dB; Frequency response: 50 Hz - 18 kHz - Updated: 2026-10-23 - Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt) - Prices: RON, VAT included; prices and stock as of 2026-11-11 01:49 (Europe/Bucharest) ## Description FM stereo radio receiver module with DSP and PLL, LCD display and two rotary encoders VOL and FRE for volume and tuning, ideal for active speakers, wireless microphones, school public address systems and DIY projects. It covers the standard 87.0 - 108.0 MHz band, extendable to 76.0 - 108.0 MHz in Campus mode for university stations, with 500 mW stereo audio output on headphones or 2x3 W on speakers, UART serial control and automatic settings memory. The FM radio receiver module combines a DSP circuit (digital audio signal processing) with a PLL synthesizer, designed as a complete receiver block for active speakers, school PA systems, wireless microphones with dedicated receivers, DIY bench radios, or audio monitoring stations. The board has its own controller, LCD display, and two rotary encoders, so it operates independently without requiring an external development board for basic use. Reception covers the standard 87.0 - 108.0 MHz band, and by enabling Campus Mode the band extends to 76.0 - 108.0 MHz, for university radio stations broadcasting below the lower limit of the commercial band. Tuning is done with the FRE encoder, and volume with the VOL encoder, both with push action for additional functions (mute/unmute on VOL, automatic squelch on/off on FRE). The digital squelch is adjustable in 20 steps, and the volume in 30 steps, both shown on the LCD. The module also supports control via UART TTL serial communication, with dedicated AT commands for frequency, volume, campus mode, and squelch threshold. Among the main features are the DC3.0-5.0V power terminal with + and - pins, the SP_R and SP_L pin pairs for the two speaker channels, the FM_ANT pad for an external antenna, the Earplugs jack with automatic headphone/speaker switching, the LCD display with adjustable backlight, and the two VOL and FRE encoders. Power is supplied at 3.0 - 5.0 VDC through the DC3.0-5.0V terminal, recommended from a battery or a stabilized and filtered supply, not from a phone charger or another unfiltered switching supply, because its noise affects reception. Through the UART TTL serial interface, the module can be controlled by a microcontroller or a computer (via a USB-TTL adapter), being compatible with Arduino, ESP32, STM32, or Raspberry Pi for automating tuning, volume, and Campus mode. Specifications: Supply voltage: 3.0 - 5.0 VDC Current consumption: under 50 mA at minimum volume, up to 400 mA at maximum volume Type: Stereo FM receiver module with DSP and PLL Frequency band (Campus off): 87.0 - 108.0 MHz Frequency band (Campus on): 76.0 - 108.0 MHz Audio frequency response: 50 Hz - 18 kHz Audio output power: 500 mW for headphones, 2 x 3 W for speakers Signal-to-noise ratio: minimum 30 dB Volume: 30 digital steps, adjustable from the VOL encoder Serial communication: UART TTL, 38400 bps, AT commands for frequency, volume, campus mode, and squelch threshold Display: LCD showing frequency, volume, stereo/mono, Campus mode, and adjustable backlight Antenna: FM_ANT pad for external antenna, recommended 75 cm whip Integrated functions: station search and memory, automatic settings save on power loss, automatic headphone/speaker switching, digital squelch adjustable in 20 steps Dimensions: 80 x 50 mm Layout: Element Function FM_ANT Pad for the external FM antenna, recommended 75 cm whip. USB AUDIO Pins marked on the board, reserved for an optional USB audio interface, depending on the board version. DC3.0-5.0V (+, -) Module power terminal, 3.0 - 5.0 VDC. SP_R (SP+, SP-) Audio output for the right speaker channel. SP_L (SP+, SP-) Audio output for the left speaker channel. Encoder FRE Reception frequency adjustment, short press to turn automatic squelch on/off, press to enter squelch threshold adjustment. Encoder VOL Volume adjustment in 30 steps, short press for mute/unmute, long press while off to switch Campus mode. LCD display Displays frequency, volume, stereo/mono status, Campus mode (C0/C1), and backlight status (B0/B1). Earplugs jack Headphone output, with automatic switching of the amplifier from speakers to headphones when connected. Mounting holes 4 holes for fixing the board. Pinout: Connector Pin Function DC3.0-5.0V + Positive power supply, 3.0 - 5.0 VDC DC3.0-5.0V Negative power supply, ground SP_R SP+ Right channel audio output, positive SP_R SP- Right channel audio output, negative SP_L SP+ Left channel audio output, positive SP_L SP- Left channel audio output, negative FM_ANT Pad for the external FM antenna (recommended 75 cm whip) USB AUDIO Reserved pins for the optional USB audio interface UART TX, RX, GND TTL serial access for external control (AT commands), 38400 bps LCD command Status C0 Campus mode disabled, band 87.0 - 108.0 MHz C1 Campus mode enabled, band 76.0 - 108.0 MHz B0 LCD backlight turns off automatically after a set interval B1 LCD backlight stays on permanently Usage: Connect the power supply to the + and - pins of the DC3.0-5.0V terminal, observing polarity and using a voltage between 3.0 and 5.0 VDC. Power the module from a battery or from a stabilized and filtered supply, not from a phone charger or another unfiltered switching supply, because its noise is introduced into reception. Connect 4 ohm / 3 W speakers to the SP_R and SP_L pin pairs, or connect headphones to the Earplugs jack, in which case the speaker output stops automatically. Attach an external antenna to the FM_ANT pad, preferably a 75 cm whip, positioned away from sources of electrical noise. Turn the FRE encoder to tune the desired frequency and the VOL encoder to adjust the volume, following the values shown on the LCD. To listen to university radio stations outside the commercial band, turn the module off, long-press the VOL encoder until the LCD shows C1, then turn the module back on for the extended 76.0 - 108.0 MHz band to become active. To return to the standard band, repeat the shutdown procedure and long-press the VOL encoder until the LCD shows C0. Short-press the FRE encoder to turn automatic squelch on or off, and when it is active, press again to enter squelch threshold adjustment (0-20) and rotate the encoder to the desired value. For control from a microcontroller or computer, connect the UART pins marked on the board (TX, RX, GND) to a USB-TTL adapter or to the serial port of an MCU, using TTL level and 38400 bps speed, then send AT commands for frequency, volume, or Campus mode. Do not exceed the 5.0 VDC supply voltage and do not reverse polarity, to avoid damaging the module.