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Two Decoders ... One 'Keep-Alive' ?
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 Posted: Wed Jan 23rd, 2019 06:37 pm
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Eric T
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I'm planning to add a keep-alive to a small tank locomotive.
The keep-alive will be hidden in a tender, and I would like to have a backup light on the tender as well.

The locomotive's stock decoder has an embedded sound module, so I'd rather not replace the whole board,
but the decoder does not have an output for a backup light either.

In addition, I only want to run two wires to the tender to simulate air and fuel lines. 
(It will be an oil tender)

My proposed solution is to put a mobile decoder in the tender, that uses the same address as the locomotive,
with electrical pickup from the tender's wheels.
 
But I don't want the backup light to go out over un-powered turnout frogs or rough track,
so I'd connect it to the keep-alive as well since there isn't room for two keep-alives and a decoder in the tender shell I want to use.

Will this plan work if the two decoders are wired in parallel?


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 Posted: Wed Jan 23rd, 2019 09:08 pm
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NathanO
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What decoder are you using right now?

Nathan

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 Posted: Wed Jan 23rd, 2019 10:26 pm
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Eric T
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NathanO wrote: What decoder are you using right now?

The locomotive is a Bachmann On30 0-4-0 Porter.

I'm planning to use a TCS T1-LED in the tender.


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 Posted: Thu Jan 24th, 2019 01:10 am
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NathanO
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What decoder do you have in the locomotive?

Nathan

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 Posted: Thu Jan 24th, 2019 02:18 am
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Eric T
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NathanO wrote: What decoder do you have in the locomotive?

Nathan


I'm using the locomotive's stock decoder.

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 Posted: Thu Jan 24th, 2019 12:45 pm
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NathanO
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The instructions that came with the locomotive should say which Soundtraxx decoder it has.

Then you can go to the Soundtraxx web site and get the information on what they call the Current Keeper.

Nathan


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 Posted: Thu Jan 24th, 2019 12:57 pm
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NathanO
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If it is the 21 pin decoder then the backup light should be pin 7.

Nathan

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 Posted: Thu Jan 24th, 2019 03:38 pm
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Eric T
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Nathan,

I'm not asking whether a keep-alive/current-keeper can be added to my loco,

I'm asking whether a single capacitor can feed two decoders.


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 Posted: Thu Jan 24th, 2019 05:06 pm
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NathanO
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If you put a small diode to each one so they do not draw form each other it should work.

Nathan

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 Posted: Thu Jan 24th, 2019 06:16 pm
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NathanO
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This should work.

Nathan

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