Example 1: Bachmann OO Robinson LNER O4, big speaker, small stay-alive

Kit: MX644D; IceCube28X18X08-2W

Only minor modifications required to the plastic slope under the coal tender to fit a really good sound to the O4...

Here's another example, almost exactly the same, but with some additional holes drilled through for the sound to escape from.

Photos provided courtesy of Mark Larder and Stephen Payne

Example 2: Similar, but more compact stay-alive added

Kit: MX644D; IceCube28X18X08-2W; LifeLink+4x Tall Tantalums

Same approach, but finding a neater location for a more compact stay-alive - LifeLink PCB with a small array of Tall/Narrow Tantalums joined in parallel, which tuck neatly under the decoder.

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.