Video Archive         Recent Topics      
YMR logo

You are here:  Your Model Railway Club > Getting You Started. > Electrics - DC > shuttle unit timing adjust To bottom of page
                 

 Moderated by: Spurno
Start New Topic Reply Printer Friendly

shuttle unit timing adjust - Electrics - DC - Getting You Started. - Your Model Railway Club
AuthorPost
 Posted: Mon Apr 9th, 2018 12:43 am
PMQuoteReply
link to this 1st post
cernem1alt
Full Member


Joined: Sat Mar 18th, 2017
Location: Dorchester, United Kingdom
Posts: 21
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

What I want to do is make the train wait longer on my Mr Rails DC shuttle



I have one of these DC shuttle units which has the two diodes either end and a trimmer for the timing adjust on the circuit board, however I have only a very short 2ft end to end run on my 009 track which I use this unit, I need to get a longer wait at both ends on a slow speed (loco is a Kato 103 chassis) at the moment the trimmer is as far set for long wait as it can go and it only waits about 10 seconds I am wondering if I change the value of the 15k resistor on the board to a lower value? opposite to this mod below say 10k for a longer wait?????

On the Mr Rails web it says
"IN GENERAL THE TIME SPAN WE HAVE ALLOWED IS FOR A REASONABLE DISTENCE IF YOU HAVE A LONG SHUTTLE AND THE LOCO NEVER REACHES EACH END BEFORE ITS TIME TO RETURN AND YOU HAVE TURNED THE SPEED DOWN THEN A CHANGE IN VALUE TO THE 15K RESISTOR COLOURED BROWN GREEN ORANGE WILL NEED TO BE INCREASED TO A 22 K RESISTOR OR A 33K RESISTOR  THIS WILL DOUBLE THE TIME TAKEN TO TRAVEL TO EACH END"

any ideas

thanks Mike



____________________
DCC NCE Powercab 00 009 & 009 society member
Back To Top PMQuoteReply

 Posted: Tue Apr 10th, 2018 04:51 pm
PMQuoteReply
link to this 2nd post
BCDR
Moderator


Joined: Sat Oct 19th, 2013
Location: Reston, Virginia USA
Posts: 2514
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Mike,

Increase not decrease the R on the board. This looks like a capacitor driven transistor trip circuit. Decreasing the voltage to the Ts should increase the time to when they trip (which is what the pot does with the current allowed by the as supplied R). The relay then flips the current to the diodes. (Caveat here - I came late to electronics, wiser heads may know better). From the website the more expensive model looks a lot better for what you want to do.

Nigel



____________________
©Nigel C. Phillips
Back To Top PMQuoteReply

 Posted: Tue Apr 10th, 2018 05:47 pm
PMQuoteReply
link to this 3rd post
cernem1alt
Full Member


Joined: Sat Mar 18th, 2017
Location: Dorchester, United Kingdom
Posts: 21
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

I have a 33k resistor in the box so I will give that a go and report back

Thanks Mike

33k fitted and not made a great deal of difference hmmmmmmmmmmm scratches head :hmm



____________________
DCC NCE Powercab 00 009 & 009 society member
Back To Top PMQuoteReply

This is topic ID = 15546     Current time is 08:55 am  
You are here:  Your Model Railway Club > Getting You Started. > Electrics - DC > shuttle unit timing adjust
You can type a quick reply to this topic here. Click in the box below to begin.

Or to reply to an individual post, or to include images, attachments and formatted text,
click the Quote or Reply buttons on each post above.

To start a new topic in this forum, click the Start New Topic button below.
To start a new topic in a different forum, click the Forum Jump drop-down list below.
Start New Topic


Back to top of page

           
15 Most Recent Topics

Problems with this web site? Please contact the Webmaster.

All material submitted to this web site is the responsibility of the respective contributor. By submitting material to this web site you acknowledge that you accept full responsibility for the material submitted.
Unless stated otherwise, all the material displayed on this web site, including all text, photographs, drawings and other images, is copyright and the property of the respective contributor. Registered members are welcome to use it for their own personal non-commercial modelmaking purposes. It must not be reproduced or re-published elsewhere in any form, or used commercially, without first obtaining the owner's express permission.
The owner of this web site may edit, modify or remove any content at any time without giving notice or reason.    © 2008

                 

Recent Topics Back to top of page

Powered by UltraBB 1.15 Copyright © 2007-2011 by Jim Hale and Data 1 Systems. Page design copyright © 2008-2013 Martin Wynne. Photo gallery copyright © 2009 David Williams.