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by TimberSurf
Mon Oct 22, 2018 12:18 pm
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

Erm....what's a snubber? :? Thanks End2end An RC snubber (Resistance Capacative) is an electric circuit intended to suppress voltage spikes. Usually consisting of a resistor and a capacitor in series across (in parallel with) the supply. As a 'tuned' circuit, components are selected to suppress fre...
by TimberSurf
Mon Oct 22, 2018 10:11 am
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

60 meters?
If your track is that long, you should definitely look at snubbers at each end! :(

6 meters. hmm not so bad
by TimberSurf
Mon Oct 22, 2018 9:16 am
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

I can't find a brilliant video I once found on the subject, so without getting really technical, problems can be had with ringing on DCC. This is in the form of spikes at the leading edge of the square wave. In essence, these induced spikes can cause 70v peak to peak to be seen. There are fixes, lik...
by TimberSurf
Sun Oct 21, 2018 11:12 pm
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

Sorry, yes, I meant Schottky
DCC is not a fixed frequency, it varies dependant on the signals being sent! Technically it could be from 10kHz to 17Khz or anywhere in between, at any given segment in time, I was rounding up to simplify.
by TimberSurf
Sun Oct 21, 2018 10:44 pm
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

I may be scaremongering here, as you may NOT have a problem, but technically, you should use a fast recovery diode network (bridge rectifier) or commonly known as Schottky 1 diode. Normal diodes are only designed for (50Hz) 'mains' frequency, but DCC is in the region of 20,000hz (20KHZ) and normal d...
by TimberSurf
Sun Oct 21, 2018 10:07 pm
Forum: General Model Railway Discussion / News
Topic: Lumsdonia Website Updates
Replies: 96
Views: 4025

Re: Lumsdonia Website Updates

I am branching out (pun intended :roll: ) into video versions of my webpage "How to's" :wink: With a new found confidence in the output of my new super camera and some tripod/clamp/bencharmyajigs, I have documented one of my more graphical methods of tips - How To make removable loads (sem...
by TimberSurf
Sun Oct 21, 2018 4:05 pm
Forum: Personal Layouts - Under Construction
Topic: New / Old
Replies: 64
Views: 2313

Re: New / Old

Airfix telegraph poles are now made by Dapol and are readily available https://www.dapol.co.uk/c024-telegraph-poles-20-557
by TimberSurf
Sun Oct 21, 2018 9:57 am
Forum: Personal Layouts - Under Construction
Topic: Frontington & Backwoods Railway
Replies: 17
Views: 337

Re: Frontington & Backwoods Railway

You could scratchbuild your own stairs from styrene, but if that sounds too ambitious, try Plastruct, they make the stairs STA-6 and the handrails SR-4 http://www.plastruct.com/catalog/Vol_10_CatalogSMFL.pdf Given the cost of these two packets, it may be cheaper to just buy a new Dapol signal box ki...
by TimberSurf
Sun Oct 21, 2018 9:17 am
Forum: Model Railway Shop
Topic: What I'd like to see in this excellent forum, if I may...
Replies: 4
Views: 127

Re: What I'd like to see in this excellent forum, if I may...

To be honest, your the first to ask how I got my handle! My father was famed for chopping tree's down and would shout "Timber" as it fell, following in his footsteps as a Boy Scout leader, I took the nickname on. With the advent of an interest in amateur radio, I used the same name and fin...
by TimberSurf
Sun Oct 21, 2018 12:35 am
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

Good point Rob, a 50 to 200 ohm resister can be fitted in the supply to limit capacitor charge inrush.
by TimberSurf
Sat Oct 20, 2018 10:46 pm
Forum: Scratch and Kit building
Topic: Station signage
Replies: 5
Views: 118

Re: Station signage

I do mine in Excel, see my thread
I could not find what it should be, but I figured Calibri was the closest
Image
by TimberSurf
Sat Oct 20, 2018 10:35 pm
Forum: Electronics
Topic: Am i doing this LED work correct?
Replies: 24
Views: 179

Re: Am i doing this LED work correct?

This is a pet subject of mine. One that I have not cracked the ultimate circuit for! (as yet) What DCC are you using? (determines the voltage it puts out). The LED strips have current limiting resistors (or current limiters), if the voltage is excessive you could use an LM7812 (100mA) or a voltage P...
by TimberSurf
Sat Oct 20, 2018 10:09 pm
Forum: Personal Layouts - Under Construction
Topic: Frontington & Backwoods Railway
Replies: 17
Views: 337

Re: Frontington & Backwoods Railway

I am sold on dust covers, especially in dusty lofts and garages. Great job, just find a blue sheet and you have a sky!

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