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Old 25-04-2018, 09:27 AM   #1
Doomswell
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Default Hornby TTS in Bachmann Type20

Hi Everyone, my first post...

I have two Bachmann type 20s which I want to install sound chips in. Due to cost and not having a completed layout or a decent DCC controller (I usually have an analogue controller plugged in and swap to Bachmann Elite 10 function only for DCC) this project has not been a priority.
Now Hornby have released their TTS chip for type 20s and I was about to buy two of them when I realised maybe there were drawbacks...

I will need 21pin to 8pin adapters, but my concern is additional functions. There would be only one spare function on a TTs chip to control lights, so one end only of each loco could have a white light.
Do other sound chips have 4 spare functions for whites and reds both ends of a loco?

Has anyone done this?

I would appreciate some advice.
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Old 25-04-2018, 09:37 AM   #2
Steve M
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I have already done the TTS conversion on the Bachmann class 20 - see link.

http://www.modelrailwayforum.co.uk/s...ad.php?t=13617

My version didn't have lights (do any of them?) so limited functions weren't an issue. Yes other decoders with more functions are available but they will cost an awful lot more.
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Old 25-04-2018, 09:46 AM   #3
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https://d2rz29q2n53c9a.cloudfront.ne...0430150139.jpg looks like having lights
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Old 25-04-2018, 09:49 AM   #4
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The TTS has 8 pins with white light and red light built in also a green wire as a 3rd function so just plug it in and lights will work by pressing the relevant function number.........HB
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Old 25-04-2018, 10:12 AM   #5
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Quote:
Originally Posted by Sol View Post
Thatís a little misleading - none of the old Bachmann class 20 had lights fitted as standard, but there is a new version due for release that probably will have them already installed.
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Old 25-04-2018, 12:39 PM   #6
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Plenty about this conversion on another RM forum...
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Halton Brat, running Hornby 00 via Elite, Select Walkabout and eLink DCC using Railmaster Pro and occasionally Rocrail, β-tester. http://myweb.cytanet.com.cy/honnor/
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Old 27-04-2018, 09:33 AM   #7
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Thanks Steve M, so I'll need a smaller speaker.

The Bachmann 20 does not have lights so I would need to fit them. I'm just not clear how the TTS light function works, will it illuminate whites at the front and reds at the rear simultaneously as if running "light loco" or could you illuminate only the front whites as a loco hauling a train would have?
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Old 27-04-2018, 09:56 AM   #8
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As I said in the other thread, a sugar cube speaker makes the installation very easy.

Regarding lights, I guess you would need to test the outputs from the decoder when the appropriate functions are selected - assuming they are already built into the decoder bearing in mind the TTS 20 isn’t fitted with them as standard.
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Old 27-04-2018, 12:44 PM   #9
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TTS decoders run standard directional lights from F0. What you see lit depends upon how you wire them within the loco, noting that a Hornby TTS loco will not be wired to the decoder socket inner four pins - you have to do that. The standard is blue common positive, white for forward facing lights (usually white on front and red on rear) and yellow for rearward facing lights. There is a green connection which operates from F18 on steamers and F25 on diesels that could be used for firebox glow or cab lights, etc or by suitable circuitry to get your train lights to accord with prototype convention with rear reds off in train.
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Old 27-04-2018, 01:28 PM   #10
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As the loco is from Bachmann, and has the 21 pin socket, you will need to identify the correct terminals on there to connect your lights to if you fit them.
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