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DCC 8 pin NEM652 to 21 pin NEM660 21MTC converter adapter
$2.99 AUD
This handy little board will convert an 8 pin decoder so that it can be fitted into a loco requiring a 21 pin decoder.
Also has solder pads for speaker and the selection of AUX1-4 if your decoder and loco supports it.
Supplied individually.
Size of board is 20x20mm.