Search found 64 matches

by Albert
Tue Mar 31, 2020 3:35 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Re: Track Circuits (Train on Track Indicators.

Thank you, fourtytwo. I'm going to need a little while to get my head around this. Would it make sense to switch to private messages, or even email, to handle any further questions I'm bound to have? You are right about the image quality. It looks reasonable on my screen, but printed out the lines a...
by Albert
Tue Mar 31, 2020 11:12 am
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Re: Track Circuits (Train on Track Indicators.

Hi fourtyrwo Sorry, the pwm voltage is whatever you feed to the arduino, which basically is just a timer and a switch. I'd expect rise time to be practically instantaneous. I normally use 12v, taken from a wall wart switch mode transformer. If I understand so far that means the bias voltage would be...
by Albert
Mon Mar 30, 2020 8:24 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Re: Track Circuits (Train on Track Indicators.

Hi, fourtytwo In its original incarnation I was using HO (00 to Brits) on a 2ft diameter circle of track! PWM gave me all the control I wanted for my purposes. I've now moved to N to get more railway on a small board. I believe that Arduino PWM runs atbetween 500 and 1000 Hz, depending on the model....
by Albert
Mon Mar 30, 2020 8:02 pm
Forum: Electronics
Topic: Layout sounds
Replies: 60
Views: 7724

Re: Layout sounds

Assuming that sound quality requirements are not terribly high, you could pair one of those with a small powered (self-amplified) mini speaker. Something like this, plus some rechargeable AAA batteries would come in at about a fiver per location, including the player I linked earlier. https://smile....
by Albert
Mon Mar 30, 2020 3:30 pm
Forum: Electronics
Topic: Layout sounds
Replies: 60
Views: 7724

Re: Layout sounds

How about something like this: https://www.ebay.co.uk/itm/Mini-Portable-Digital-MP3-Player-Clip-USB-Music-Media-Play-Fit-Micro-SD-TF-Card/352809170897?hash=item522510b7d1:g:FMgAAOSwgrBdkagM It's basically an autonomous music player like an iPod Shuffle but at a fraction of the price. Worth trying fo...
by Albert
Mon Mar 30, 2020 1:31 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Re: Track Circuits (Train on Track Indicators.

Thank you, fourtytwo. Yes, I know which end of a soldering iron to hold, but I'm much more at home with digital systems (designed and built my own video digitiser back in the 80's). When it comes to working directly with transistors I'm happy enough with concepts and (very) basic theory, but have ab...
by Albert
Sun Mar 29, 2020 11:15 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Re: Track Circuits (Train on Track Indicators.

Thanks. I'm going to have to get my head around this. Unfortunately 'transistors' and 'of course' don't go together for me.
by Albert
Sat Mar 28, 2020 3:56 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Re: Track Circuits (Train on Track Indicators.

D0260 wrote Have a look at this video....... ... Track detectors can be expensive though... Thanks, but I'd really lke to find a way to solve this without throwing lots of money at it. I seem to remember that Roger Amos had a design, so I've ordered his book. His web site has disappeared and there a...
by Albert
Fri Mar 27, 2020 5:13 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 1806

Track Circuits (Train on Track Indicators.

Hello all, I've been out of things for a while but I'm just resurrecting a project to control a DC layout using an arduino. I'm starting simple with an oval and two locos. The idea is that they follow each other around the track, relying on block working and track circuits to avoid ever actually cat...
by Albert
Thu Aug 17, 2017 5:29 pm
Forum: Track/Layout Design
Topic: Minimum HO radius
Replies: 6
Views: 998

Re: Minimum HO radius

Thanks, all. Looks like I might have to up my maximum baseboard size a wee bit.

I'm sure that with a bit of advice from the experts I'd be able to do a better job of flexi-track laying, but I'd prefer to have an easier way to change the layout to accommodate different track arrangements.
by Albert
Thu Aug 17, 2017 12:16 pm
Forum: Track/Layout Design
Topic: Minimum HO radius
Replies: 6
Views: 998

Minimum HO radius

OK, I know this will go against the grain for most of you, but I want to put together a very small layout with absolutely no landscaping and no consideration for realism. Having got that out of the way, I'll explain. My main interest in model trains is the stuff below the track head, particularly th...
by Albert
Fri Oct 21, 2016 1:21 pm
Forum: Electronics
Topic: DIY turntable for fiddle yard
Replies: 3
Views: 786

Re: DIY turntable for fiddle yard

Probably powered because the idea is have it at an exhibition and be able to cover over the two fiddle yards. The plan is to have short trains that will fit on the turntable (0-4-0 plus 2 short wagons/coaches) and to ring the changes. So far I'm considering a 555-based servo approach or something mo...
by Albert
Fri Oct 21, 2016 11:23 am
Forum: Electronics
Topic: DIY turntable for fiddle yard
Replies: 3
Views: 786

DIY turntable for fiddle yard

I need to build a couple of (cheap, not pretty!) turntables for an inglenook project. The actual build should be easy enough but I need to find a way to stop accurately at each road. I have a couple of ideas, but if anyone can point me at any on-line sources I'd rather not reinvent the wheel. The tu...
by Albert
Sun Sep 04, 2016 9:15 am
Forum: Track/Layout Design
Topic: Uncoupling -- picking a method -- Help!
Replies: 6
Views: 1115

Re: Uncoupling -- picking a method -- Help!

Hattons have both the uncoupler and point motor in stock at a tenner for the two. Thanks TBH you are going to struggle to do this for "any" coupling. If it's just to uncouple in a terminus station then just use an ordinary uncoupler. If you want "delayed" uncoupling so you can s...
by Albert
Sat Sep 03, 2016 9:46 pm
Forum: Track/Layout Design
Topic: Uncoupling -- picking a method -- Help!
Replies: 6
Views: 1115

Re: Uncoupling -- picking a method -- Help!

Thanks, both. End2End, the wire in tube sounds good but I have a nasty feeling that the physical design of the layout and baseboard might not be ideal for installing the under-board part. Bufferstop, I think you're right about needing an active solution to handle as many tatty old couplings as possi...

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