VR DERM and MT trailer - RTR 1/87 by IDR Models

 
  Poath Junction Chief Commissioner

Location: In front of a computer most of the time.
For those who missed the ad in this months AMRM, IDR have details of their next project at https://www.facebook.com/idrmodels
"We are very happy to announce the Victorian railways DERM and MT trailer. This model is currently being tooled and the first test shots will be available in a couple of months. The DERM is being produced with DCC sound complete with on board stay alive circuit."

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  bevans Site Admin

Location: Melbourne, Australia
This does sound interesting.  Some photos











What is the "stay alive circuit" they speak of?
  MEASWELL Junior Train Controller

Location: werribee/tullamarine
It's also known as the Bee Gee's circuit!!! Laughing  just keeps Uh, Uh, Uh, Uh  Stayin Alive


I know sad dad joke!!!!!
  Poath Junction Chief Commissioner

Location: In front of a computer most of the time.
What is the "stay alive circuit" they speak of?
bevans
in oversimplified terms, a capacitor.
In less oversimplified terms, a capacitor with in-rush current limiting resistor to stop the DCC system thinking a short has occurred.
In foolproof terms, add some extra diodes and capacitors as outlined in this article https://s3-us-west-2.amazonaws.com/mrhpub.com/2019-06-jun/online/index.html?page=51

the "stay alive" circuit simply powers the DCC decoder (and motor and sound) for brief periods when track voltage is lost.

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