Beier SFR-1-D Double Sound Speed Controller



The SFR-1-D at a glance:

  • All around module: combination of double speed controller, sound module and light control unit
  • Suitable for all types of RC models with two motors
  • For brushed DC motors
  • Supply voltage: 6 - 18 V / Max. motor current: 30 A
  • Powerful BEC with 5,6 V, 3 A
  • Inclusive 700 sound files for all type of models
  • Powerful built-in amplifier for optimal sound quality
  • 8 proportional inputs to control sound, speed controller, light and servo functions
  • Sum signals S-Bus / SUMD / i-Bus available
  • 16 switching outputs for LEDs, lamps, relays, etc.
  • 2 mini speed controller for auxiliary drives
  • 4 programmable servo outputs to control additional movements
  • Extra outputs for smoke generator and BB gun / IR battle-unit
  • Adjustable speed control functions: load regulation, mass and steering inertia and different brake functions


The SFR-1-D is an allround module and combines the sound module USM-RC-2 and the
double speed controller UFR-1230-D in one unit.

It comes with a large light control unit, four servo outputs, two additional mini speed controller, extra outputs for smoke generator, Xenon flash and IR battle-unit (Torro/Taigen/Heng-Long).

With various setting options the SFR-1-D can be easily adjusted to all model requirements and driving behaviors. For an easy start we have about 100 ready to use sound projects and 700 sound files for various model types.

The Software Sound-Teacher SFR-1-D is only for Windows,
with an emulator like WineBottler is is also possible to use the Sound-Teacher with a Mac or other operating systems.

Sound functions:
For an authentic sound of the model, sounds can be selected for following areas:
  • Driving and engine sounds for one motor (speed-dependent)
  • Additional sounds (e.g. horns, hydraulic and compressed air noises)
  • Random sounds (e.g. squeaking, animal and ambient sounds)
Driving functions:
One brushed and bell-armature motors (DC) can be controlled smooth and realistic with the SFR-1-D. An ideal driving behavior can be achieved through a large number of settings.

The speed controller on the SFR-1-D has following characteristics:
  • Different mixer types
  • Different brake functions (with hand- and emergency brake)
  • Adjustable load regulation
  • Adjustable mass inertia
  • Steering inertia (with adjustable steering ankle limits)
  • Adjustment of throttle curve for different driving behaviors
Light functions:
To realize different light effects, the SFR-1-D has 16 switching outputs to connect LEDs, lamps and other consumers. Light functions, such as low beam, rear light, brake light, indicator lights, warning lights, flickering lights, etc. can be easily implemented and controlled.

All light functions can be activated or deactivated manually with a proportional channel, a nautic/multiswitche modules, the Android Bluetooth App "SFR-1-D Controller" or automatically by sounds and movements.

Servo movements:
With four additional servo outputs, movements can be synchronized to the played sound.
All SFR-1-D functions can be activated or deactivated manually by proportional channel, nautic/multiswitche modules, the Android Bluetooth App "SFR-1-D Controller" or automatically by sounds and movements.

Additional information can be found in the SFR-1-D operating manual (PDF).

You can find answers to frequently asked question in our forum under FAQ .

To test our software "SFR-1-D Sound-Teacher" you can download a demo version.

Technical data

Supply voltage (Ub): 6 – 18 V DC
Power consumption: Quiescent current: approx. 1 mA
Standby current (sound, motor and outputs off): approx. 80 mA
Motor current M1 + M2: max. 30 A continuous current, 60 A short time (1 minute)
Motor current M3 + M4: max. 2 A continuous current, 3 A short time (1 minute)
BEC voltage: 5,6 V
BEC current: max. 3 A continuous current, 5 A short time (10 seconds)
Proportional inputs: 8 channels (1,000 - 2,000 ms)
Supported protocols:
  • PPM / PCM (1,000 - 2,000 ms)
  • Sum signal S-Bus (max. 16 channels)
  • Sum signal SUMD (max. 16 channels)
  • Sum signal i-Bus (max. 16 channels)
  • Nautic / Multiswitch / Multikanal / EMS
Servo outputs: 4 outputs (1,000 - 2,000 ms)
Output for smoke generator: max. 3 A
Output for BB gun: max. 3 A
Switching outputs: 16 outputs (npn – open collector), max. 1,5 A per output, the total current of all outputs is not allowed to exceed 3,0A
NF amplifier: 20 W
Loudspeaker: 4 - 8 Ohm
Volume setting: With extra poti (100 kOhm) and/or by the radio
Memory for sound files: Micro-SD-card (1 to 64 GB)
May. length of sound: approx. 180 minutes per 1 GB
Supported sound files: WAV-format, 8/16 Bit, Mono/Stereo, 22/44 kHz
Sound output: 16 Bit, Mono, 22/44 kHz
Number of possible sounds:
  • 5 running steps/gears (internally in up to 255 steps accelerated)
  • 8 change sounds between the running steps/gears
  • 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
Protection features:
  • Short circuit protection at motor output stage
  • Short circuit protection at switching outputs
  • Short circuit protection at BEC
  • Temperature monitoring
  • Battery voltage monitoring
  • Protection while switching on power supply
  • Failsafe for proportional inputs
Cables for connection:
  • For battery: 2 x 2,5 mm², length approx. 25 cm (with Deans T female connector)
Permissible ambient temperature: 0 – 60° C
Permissible relative air humidity: Max. 85 %
Size: 88 x 60 x 25 mm (with SD card: 88 x 63 x 25 mm)
Weight: 100 g

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