A nice simple approach on Heljan's OO DPU here, using an MS sound decoder, decent speaker, and the standard 1000uF capacitor
that comes with the MS440 for stay-alive.
There are no pads for a speaker on the model's PCB - just a little 2pin socket but no plug provided to go into it! So, we wire
up 2 purple wires direct to the decoder for the speaker instead.
Simply plug the decoder in and we can test motion and lighting.
A perfect space for an 8mm dual IceCube speaker is behind one of the cab walls, and our 1000uF capacitor fits easily at the
opposite end. Secure with some BlackTack.
Tidy up the wiring and we're all done!
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.