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Heljan OO Gauge Class 07 DCC Sound

Kit: MX648, Minnow6 speaker, SACC16 with 5x 220uF Tantalums

This is the big brother to Heljan's Class 05 diesel - the vast majority of the model is identical, so not much space for a sound decoder. Speaker has to go in the cab, but the bonus of the Class 07 is that there is a deep well of space at the rear end where we can insert a stay-alive!

MX648 is carefully wired in place of the original 6pin DCC socket/board, and we add resistors to protect the directional lighting. A Minnow speaker sits on the cab floor, though we could probably have found other approaches, and perhaps got a SugarCube7 in there instead. Stay-alive goes in the rear area in the form of a SACC16 kit with some Tantalums on board. Carefully routing the wires of course, and keeping everything neat and flush is important in this model.

The result is a really nice little diesel, with good running qualities.


Please note that these guides are provided as useful resources for you, as-is. YouChoos cannot be held responsible for errors in the information, or for any damage caused to your models or equipment if you choose to follow any of the steps detailed here.

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