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Hornby OO Class 31 diesel with DCC Sound, lighting and stay-alive

Kit: Zimo MX645R; Zimo Dumbo LS26X20X08-1W; cab lights; crew; 3x 470uF stay-alive

Pop the body off (4 screws) and we find a decent amount of space available underneath the circuit board.

Prepare our 3x 470uF stay-alive capacitors (connect in parallel) and the small Dumbo speaker

The MX645R plugs in, the inserts under the circuit board, along with the Dumbo speaker, attached underneath with some BlackTack.

The customer also wanted independent cab lights on his model, so these are wired into the green and brown wire outputs from the decoder. We used simple yellow tower LEDs for the cab lights - they are quite dim, but that's probably reasonable in a Class 31!

The another requirement from the customer was to be able to independent switch the rear-end lights, so we added a couple of extrac function wires to the 5th and 6th outputs of the decoder, and rewired that circuit direct instead of going via the model's circuit board for the rear-end lighting.

The final product...

Disclaimer

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.