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Hornby TTS Sound Decoder – Class B12 is a digital sound module designed for use with Hornby model locomotives that utilise Class B wiring. The decoder incorporates a built‑in speaker and provides realistic engine sounds, horn blasts and brake noises in response to throttle and brake commands. It is compatible with standard Hornby Digital Command Control (DCC) systems and can be programmed via Hornby’s TTS software.
The unit is supplied under the manufacturer part number R7145. Installation requires solder‑free connections to the Class B motor and speaker terminals, allowing it to be fitted without major modifications to the locomotive. The decoder supports up to 16 simultaneous sound channels and includes a mute function for quiet operation when required. It operates on the standard 12 V supply typical of Hornby models.
The Hornby TTS Sound Decoder – Class B12 offers a reliable way to enhance the auditory realism of model railways, meeting the expectations of hobbyists seeking an authentic experience while remaining straightforward to install and program.