Beier Sound module USM-RC-3



Requires New USM-RC-3 Sound Teacher Software

The USM-RC-3 at a glance
for Sound + Light + Servos
  • Suitable for all types of RC models with commercial remote control
  • Analogue control without radio possible
  • Additional control with smartphone app (Android)
  • 8 proportional inputs to control sound, speed controller, light and servo functions
  • Up to 16 channels via the sum signals s-bus / i-bus / SUMD / SUMD3
  • Inclusive 700 sound files for speed dependent motor, additional and random sounds
  • More than 140 ready to use sound projects for trucks, cars, ships, construction vehicles and airplanes
  • Individually programmable with the Windows software Sound-Teacher
  • Use of own recordings and songs possible
  • Powerful built-in amplifier for optimal sound quality
  • 16 switching outputs for connecting LEDs, lamps, smoke generators, relays etc.
  • Free programmable light functions and sequences
  • 1 high current output for heavy consumers, such as smoke generators
  • 1 port to forward infrared or bluetooth signals to a trailer
  • 1 port for the Kraftwerk Easybus light system
  • 4 programmable servo outputs to control additional movements
  • Connection of speed controller to control additional motors
  • Automatic sequences of servo movements
  • Data cable for connection to a PC
  • Loudspeaker with housing
  • Terminal clamp for easy connection of LEDS
  • Battery Y-cable
  • Volume control potentiometer


The USM-RC-3 sound module is the successor to our proven USM-RC-2 sound module. The module has been extensively revised, improved and expanded with more functions - and all of this with the same small design of 65 x 43 x 17 mm.

The sound module was specially developed for RC model making in order to equip all types of models with true-to-original and speed-dependent noises, numerous lighting options and additional servo movements.

Due to the extensive setting options, each model can be designed individually and uniquely according to your own ideas. Over 140 preset projects for trucks, cars, ships, construction vehicles and planes make it easy and quick to get started.

All settings are saved on a micro SD card and can be changed at any time. All you need is a PC, an SD card reader or the data cable K-USB-2 and our software USM-RC-3 Sound-Teacher. The program is compatible with all Windows versions. With a free emulator like WineBottler and Wine, however, the software can also be used with other operating systems.
Sound functions
For a true-to-original sound of the model, sounds can be selected for the following areas:
  • Driving and engine sounds for two engines (depending on speed)
  • Additional sounds (e.g. horns, bells, sirens, hydraulic noises etc.)
  • Random sounds (e.g. compressed air noises, animal and ambient noises, etc.)
A loudspeaker with an impedance between 4 and 8 ohms and a power of at least 8 W can be connected to the sound module. For an optimal sound, we recommend using a loudspeaker housing (resonance body).
Light functions
The USM-RC-3 has 16 switching outputs to which LEDs, lamps and relays, for example, can be connected to enable various lighting effects. Light functions such as dipped headlights, reversing lights, brake lights, indicators, hazard warning lights, flickering lights, etc. can be easily implemented and controlled. All light functions can be automatically activated or deactivated to match the sound and movement.

8 time-controlled output sequences can be set for automatically running lighting effects. For each step it can be determined which outputs should be switched on in a certain brightness. Different party lights, all-round lights and running lights or hazard lights can be implemented easily.

An extra high-current output with 3 A is available for connecting particularly strong consumers (with a high current consumption), such as smoke generators.

The sound module also has an extra output for connecting an IR diode for the light module LM-IR-16-4 or a bluetooth module for the light module LM-BT-16-4. In this way, the light and servo signals can be transmitted wirelessly to a semitrailer and trailer.

All light and additional functions of the sound module can be activated via nautic and multiswitch modules and controlled via the smartphone app SFR-1 Controller.
Servo functions
With four additional servo outputs, movements such as those of windshield wipers can be easily controlled and adjusted to the sound being played. Speed controllers can also be connected to the servo outputs in order to control additional motors.
Operating modes
Like its predecessor, the USM-RC-2 sound module has different operating modes. These become relevant as soon as a standard remote control with a receiver and proportional channels is not used.

However, in 99% of the applications the digital mode (optionally with speed controller UFR-1230) is used, in which the sound module is connected to the receiver via proportional channels. Hereby the module receives the information of speed and direction and plays the correct driving sound and switches automatic functions, such as indicators or a warning light when reversing.

The analog and mixed operation is only used with non-standard RC remote control systems or with speed controllers with special functions, like a cruise control. The driving speed of the model is taken directly from the drive motor(s). Various switches for controlling the functions can be connected to 4 switching inputs.

You can find more information in the operating manual (PDF).

Answers to frequently asked questions about our modules can be found in our FAQ (Frequently Asked Questions).

To test the software, a demo version of the USM-RC-3 Sound-Teacher can be downloaded.

Technical data

Supply Voltage (Ub): 5 – 15 V DC
Power consumption: Stand-by current: 80 mA
Operation: dependent on activated consumers
Proportional inputs: 8 pieces
Supported protocols:
  • PPM / PCM (1,000 - 2,000 ms)
  • Sum signal S-Bus / i-Bus (16 channels)
  • Sum signal SUMD / SUMD3 (16 channels)
  • Nautic / Multiswitch / Multichannel / EMS
Switching inputs: 4 pieces
LO signal: U smaller 2 V
HI signal: U larger 5 V
Integrated pull-up resistors 15 kOhm
Servo outputs: 4 pieces
1,000 - 2,000 ms
Switching outputs: 16 pieces
minus switching – open collector:
max. 1,5 A per output,
total current of all outputs is not allowed to exceed 3,0 A
1 piece high current output: max 3,0 A
Audio amplifier: 20 W
Loudspeaker: 4 - 8 Ohm
Volume control: By external poti (100 kOhm) and / or radio
Storage for the sound data: Micro SD-card (1 to 32 GB)
Max. length of sounds: approx. 180 minutes per 1 GB
Supported sound files: WAV format, 8/16 bit, mono/stereo, 22/44 kHz
Sound output: 16 bit, mono, 44 kHz
Number of possible sounds:
  • 5 running steps / gears
  • 8 gear shift sounds
  • Turn on noise, turn off noise, starting noise, stopping noise, idling noise, brake noise, reverse engine noise, curve squeal, flashing lights sound
  • 30 additional sounds (for example via prop channels)
  • 8 random sounds (random generator)
  • 30 tracks for WAV-Player
Random sound generator: Times between 1 to 999s adjustable
Additional ports:
  • Programming interface for data cable
  • Port for infrared diode of light modules SM-IR-16-2 and LM-IR-16-4, or Bluetooth module of light module LM-BT-16-4
  • Port for Kraftwerk EasyBus light system
Protection features:
  • Short circuit protection at switching outputs
  • Battery voltage monitoring
  • Failsafe for proportional inputs
Permissible ambient temperature: 0 – 60° C
Permissible relative air humidity: Max. 85 %
Size: 65 x 43 x 17 mm (with SD-card: 66 x 46 x 17 mm)
Weight: 25 g

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