Video Archive         Recent Topics      
YMR logo

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

 Moderated by: Spurno
Start New Topic Reply Printer Friendly

Electrics DC - Electrics - DC - Getting You Started. - Your Model Railway Club
AuthorPost
 Posted: Wed Mar 7th, 2018 03:52 pm
PMQuoteReply
link to this 1st post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi All.    I have wired an indication panel to work with manual points, so far I have tested the wiring using a battery.So far so good, I have a wall wart ( mains adaptor ) wired into the layout, but I now have to do the common return.
I am using a “ Terminal Strip “ on the panel connected via a scart cable. But how do I wire the common return to the LED ‘s via the scart without illuminating all the LED’s simultaneously . When the Scart is used in the conventional way there is an Earth wire connecting the TV and Video or WHY via the metal part of the plugs, can I utilise this wire?
Please advise.  Kevin



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 02:48 pm
PMQuoteReply
link to this 2nd post
IanLMS
Full Member


Joined: Tue Sep 27th, 2016
Location: Feltwell, Norfolk, United Kingdom
Posts: 169
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

I highly recommend reading Mr Lamberts excellent advice on his electrical page. He covers most simple wiring in a very easy to understand way. I am sure a SCART is not much different to other multi-way connectors - choose a wire for your common return and follow Mr Lamberts diagrams and you wont go wrong.  
http://www.brian-lambert.co.uk/Electrical%20page%202.html#LEDs

IanLMS



____________________
Ian Lancaster
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 02:53 pm
PMQuoteReply
link to this 3rd post
IanLMS
Full Member


Joined: Tue Sep 27th, 2016
Location: Feltwell, Norfolk, United Kingdom
Posts: 169
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Just found this link which might help select the right pin.

https://en.wikipedia.org/wiki/SCART


Ian



____________________
Ian Lancaster
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 05:41 pm
PMQuoteReply
link to this 4th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Ian.   Thank you for your reply. I have just been following the example of Telecom men, that is finding the correct wire with with a battery/buzzer combo. I looked at the Brian Lambert link, as usual it is beyond me, and I wasn’t sure what the resistor was for. With me i’m Afraid say it is a bit hit and miss.  Best wishes. Kevin



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 06:19 pm
PMQuoteReply
link to this 5th post
The Q
Full Member
 

Joined: Wed Mar 9th, 2016
Location: Somewhere In Norfolk, Or Maybe Scotland, United Kingdom
Posts: 322
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Trying to put it in laymans language...

If you are using standard LEDs without the resistor then as soon as you connect the power then you have dead LEDs.
A standard LED will use about 1.8V, if you using a 5v or 12v supply then the resistor takes the rest. Without the resistor it gives to much voltage across the LED and therefore too much current so you fry the LED.

You can buy 5V or 12 V LEDS, these just have the resistor built in..



____________________
Now I've finally started a model railway...I've inherited another...
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 06:32 pm
PMQuoteReply
link to this 6th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi The Q.    Thank you again. AFAIK the LED’s that I am using have a resistor Built in “5mm 12volt”. And I thought that they were all the same .    Best wishes.  Kevin



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 08:40 pm
PMQuoteReply
link to this 7th post
IanLMS
Full Member


Joined: Tue Sep 27th, 2016
Location: Feltwell, Norfolk, United Kingdom
Posts: 169
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

If the resistors are built in and rated for 12v then as long as you only supply with 12v, you should be good. Mr Lamberts drawing just show the resistor separate. You will have a long and short leg on the LED. The long leg will have the built in resistor, so you call this Pos +. The short leg will be considered Neg - which you would use for the common return. You can run them in a series, again just follow his advise and you will be good to go.
It all depends on how you intend for the LED's to be activated. I cheated, and purchased point indicator panels with supplied LED's from Microminiatures. These took care of the wizardry between activating the point and the LED indication panel: http://www.microminiatures.co.uk/acatalog/Model-Rail-Points-Position-Indicator.html

If you are taking the supply from the track itself, again Mr Lambert covers this in detail. 

Ian 



____________________
Ian Lancaster
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 09:13 pm
PMQuoteReply
link to this 8th post
sparky
Member
 

Joined: Thu Oct 18th, 2007
Location: Hitchin Herts, United Kingdom
Posts: 2523
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Thanks for the heads upon this product . I have just ordered one as a try out .

I had previously bought two 8 way dcc units offering 16 point cdu,s and connections for appropriate LED connections .
Out of the 16 Ways  one worked , the cdu,s got hot took a while to recharge and one of the 8 way units buzzed quite happily . I think "not fit for purpose " is the current phrase for this stuff.



____________________
reg
Back To Top PMQuoteReply

 Posted: Thu Mar 8th, 2018 11:50 pm
PMQuoteReply
link to this 9th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Ian     Thank you again, as I said at the beginning of this thread I only have four manually operated points on my plank, all operated by WIT, and I keep forgetting to throw the points. My “ Bodge Job “ is only to aid my memory.The lights are operated on their own 12 volt supply. If I was an expert??? I would like to create a “ Micro Panel”, on 
a sheet of Perspex , rather than a plywood box.   Best wishes.  Kevin



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 02:42 am
PMQuoteReply
link to this 10th post
IanLMS
Full Member


Joined: Tue Sep 27th, 2016
Location: Feltwell, Norfolk, United Kingdom
Posts: 169
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

I have 32 points and when DC used the boards from Microminiatures wired through the Peco point motors. So easy and they have memory. Just lots of wiring. When i went DCC i wanted to operate the points via my tablet so got 4 DCC Concepts ADS8FX. However every time i get a short i would have to reset every point and the panel lights dont indicate direction of point just that it was activated. I am swapping one 8 way for the ADS8SX which is an improved version and has memory for my hidden sidings. I am not sure how u would wire LEDs for WIT. Probably via a micro switch or slide switch so the LED would power up depending on the route it was set to.



____________________
Ian Lancaster
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 11:50 am
PMQuoteReply
link to this 11th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Ian.    As a non electrician . I didn’t know if my idea would work. As you undoubtedly know DPDT Slide switches have two rows of three contacts , I was using the three on one side, the other three being redundant . Redundant until the idea came to me to wire them to LED’s, and it worked, but they all didn’t illuminate hence the “ common return “ question. But now I am using the Scart socket and cable ( previously I was using “ Sub miniature.D “ cable and sockets  with crowded contacts and not easy to solder.).     Whereas the scart has more room to manoeuvre.                Best wishes



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 03:41 pm
PMQuoteReply
link to this 12th post
IanLMS
Full Member


Joined: Tue Sep 27th, 2016
Location: Feltwell, Norfolk, United Kingdom
Posts: 169
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Looks interesting and ability to use a SCART offering 20 cables in a nice tight space would be great. I am not an electrician either and all i know is what I have learnt from Mr Lambert and good old trial and error!
Someone on here must have wired their WIT points to an LED panel using a DPDT switch so I am surprised they haven't chimed in yet.

Someone must have also used a SCART as a simple means of connection.

Ian



____________________
Ian Lancaster
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 03:52 pm
PMQuoteReply
link to this 13th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

IanLMS wrote: Looks interesting and ability to use a SCART offering 20 cables in a nice tight space would be great. I am not an electrician either and all i know is what I have learnt from Mr Lambert and good old trial and error!
Someone on here must have wired their WIT points to an LED panel using a DPDT switch so I am surprised they haven't chimed in yet.

Someone must have also used a SCART as a simple means of connection.

Ian
Hi Ian.   Could that “Someone “ be me??? I had written a thread on the subject a while ago ,but, I could not find it until recently , after looking for “Mimic Panel” in the word search on the Home Page.    Best wihes



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 06:36 pm
PMQuoteReply
link to this 14th post
IanLMS
Full Member


Joined: Tue Sep 27th, 2016
Location: Feltwell, Norfolk, United Kingdom
Posts: 169
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Good luck with the venture - I wish i was an electronic expert sometimes! Good luck with the SCART and would be interesting to see a diagram of how you wired it up to LED's via a DPDT using the WIT method for the points. I have a few spare SCARTs lying around that I could possibly put to good use.



____________________
Ian Lancaster
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 06:52 pm
PMQuoteReply
link to this 15th post
Longchap
Full Member


Joined: Wed Mar 25th, 2015
Location:  Saumur, France
Posts: 1202
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Passed Driver wrote: IanLMS wrote: Looks interesting and ability to use a SCART offering 20 cables in a nice tight space would be great. I am not an electrician either and all i know is what I have learnt from Mr Lambert and good old trial and error!
Someone on here must have wired their WIT points to an LED panel using a DPDT switch so I am surprised they haven't chimed in yet.

Someone must have also used a SCART as a simple means of connection.

Ian
Hi Ian.   Could that “Someone “ be me??? I had written a thread on the subject a while ago ,but, I could not find it until recently , after looking for “Mimic Panel” in the word search on the Home Page.    Best wihes

Kevin, just hit the 'Topics I Started' button from the menu under the picture of the week:

My Own Posts      Topics I Started      My Photos

It's much faster!

Bill



____________________
At 6'4'', Bill is a tall chap, then again, when horizontal he is rather long and people often used to trip over him! . . . and so a nickname was born :)

Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 10:38 pm
PMQuoteReply
link to this 16th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Bill    Thank you for your reply . I did the “topics I started” but didn’t go back far enough. The toughest part of the project was “ buying over the counter” the scart socket.     Best wishes.  Kevin



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

 Posted: Fri Mar 9th, 2018 11:00 pm
PMQuoteReply
link to this 17th post
Passed Driver
Full Member


Joined: Thu Feb 19th, 2015
Location: Peckham, United Kingdom
Posts: 2299
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Ian    The WIT is connected to the switch , just drill a hole in the switch, and another hole in the baseboard just in front of the switch, pass the WIT through the hole and up to the point. As I said the three spare contacts are wired to the contacts on the back of the scart socket ( 1 reversed, 2 positive input from 12 volt supply which is fed to 1 & 3 depending on the position of the points), 3 normal). Then remove one plug, strip the wires and connect the wires to the LED ‘s.   Best wishes



____________________
Staying on the thread Kevin.
Back To Top PMQuoteReply

This is topic ID = 15462     Current time is 08:56 am  
You are here:  Your Model Railway Club > Getting You Started. > Electrics - DC > Electrics DC
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.