The circuit board has been developed for Märklin locomotives of the BR 05 series, such as item 37050, and fits exactly in place of the original decoder.
For decoders with a 21MTC interface.

This adapter is also suitable for sound decoders. Locomotives with Hall sensors are supported with a compatible decoder (such as ESU LokSound).
The Aux3 to Aux6 decoder outputs are amplified from logic-level to power connections and are routed to pads. The function of these connections depends on the decoder used.

Manual 8049