Search found 211 matches

by Gordon H
Wed Jul 24, 2019 4:13 pm
Forum: DCC Forum
Topic: Capacitors, chokes & mysteries - Bachmann "Hall"
Replies: 15
Views: 411

Re: Capacitors, chokes & mysteries - Bachmann "Hall"

Forgot to ask - did you have the loco on a rolling road when doing your measurements, as I suspect that is the only practical way of having the loco in action with scope probes attached. :)
by Gordon H
Wed Jul 24, 2019 12:56 pm
Forum: DCC Forum
Topic: Capacitors, chokes & mysteries - Bachmann "Hall"
Replies: 15
Views: 411

Re: Capacitors, chokes & mysteries - Bachmann "Hall"

My Pa is an electronics engineer, shared his oscilloscope with me when I wanted to tinker. Subtract the output of the DCC system track feed from the power leads of the decoder with the motor going full chat, practically no residual, just millivolts of random noise. In DC form the worst of the locos...
by Gordon H
Tue Jul 23, 2019 12:42 pm
Forum: DCC Forum
Topic: Capacitors, chokes & mysteries - Bachmann "Hall"
Replies: 15
Views: 411

Re: Capacitors, chokes & mysteries - Bachmann "Hall"

I was interested to test this last aspect when DCC arrived on the layout. The decoders were very efficient at blocking any motor noise from reaching the rails, far more effective than the supplied suppression on those same locos in original form running on DC. Just wondering what type of test you p...
by Gordon H
Tue Jun 18, 2019 12:31 pm
Forum: DCC Forum
Topic: New controller
Replies: 18
Views: 966

Re: New controller

Spike wrote:Errm I think I uderstand what your saying Gordon H, so how do i go about doing what you have said

An oscilloscope is the simplest way to confirm waveform timings of the Controller - but of course most modellers probably don't have access to one.
Rather more difficult to assess Decoder operation.
by Gordon H
Mon Jun 17, 2019 12:46 pm
Forum: DCC Forum
Topic: New controller
Replies: 18
Views: 966

Re: New controller

The Controller doesn't recognise anything. It simply outputs a waveform to the rails. Two possible situations: If the timing of the waveform the Controller generates is not to the NMRA spec, the decoder will (or should) ignore it. If the waveform decoding timing within the decoder is not to the NMRA...
by Gordon H
Thu Mar 07, 2019 7:09 pm
Forum: Electronics
Topic: Signal control switches
Replies: 13
Views: 732

Re: Signal control switches

Bufferstop wrote:There's one disadvantage to using levers, no matter which position the levers are in the signals will always start where they were even if the levers moved when there was no power on. Someone was working on a board to fix this it may have been MERG.

Yes, available to members as Kit No. 470.
by Gordon H
Mon Feb 11, 2019 12:34 pm
Forum: Exhibitions and Events
Topic: What's happened to the East Midlands Exhibition in Nottingham?
Replies: 2
Views: 198

Re: What's happened to the East Midlands Exhibition in Nottingham?

Here is a copy of the statement made by the current Exhibition Manager some time ago on another forum: "As we all know, the hobby is going through changes and these affect trade exhibitors in particular. Nottingham MRS have run the Nottingham East Midlands Model Railway Exhibition for over 30 y...
by Gordon H
Sat Feb 09, 2019 5:45 pm
Forum: Dapol
Topic: Dapol semaphore signals
Replies: 29
Views: 3108

Re: Dapol semaphore signals

There must be a reason for them designing it the way they have, but I can't see it. My suspicion all along is that they (Dapol) had very little to do with the detailed design. They probably provided a vague, improperly specified drawing on a piece of paper and gave it to someone in China who produc...
by Gordon H
Tue Jan 15, 2019 4:46 pm
Forum: Electronics
Topic: 5volt to 12volt converter
Replies: 20
Views: 940

Re: 5volt to 12volt converter

How much are they As long as you don't need more than about 1 Amp you could build one yourself with a 99p buck converter found on the likes of eBay, I built a couple myself for powering cameras on location, they were turned down to 7.4v but IIRC the buck converters could boost to 24v being fully ad...
by Gordon H
Tue Dec 11, 2018 12:35 pm
Forum: Electronics
Topic: Advice Regarding an Automatic Reversing Component
Replies: 12
Views: 696

Re: Advice Regarding an Automatic Reversing Component

Have a look at the MERG ATC System:
https://www.merg.org.uk/merg_resources/atc.php
It can do exactly what you require as a built-in feature.
No under-track sensors or microswitches either, just wires to the track sections.
by Gordon H
Mon Dec 03, 2018 12:52 pm
Forum: Personal Layouts - Planning
Topic: New Layout Ideas - Carstairs Inspired Layout
Replies: 24
Views: 1721

Re: New Layout Ideas - Carstairs Inspired Layout

One of the main points of interest in operations at Carstairs was/is the splitting and combining of Glasgow and Edinburgh sections of trains. To do the southbound combining you might want to consider extending the Up Loop line to allow room for the Edinburgh loco and coaches before they back on to t...
by Gordon H
Sat Dec 01, 2018 1:01 pm
Forum: Personal Layouts - Planning
Topic: New Layout Ideas - Carstairs Inspired Layout
Replies: 24
Views: 1721

Re: New Layout Ideas - Carstairs Inspired Layout

The layout was originally conceived and built by the Riverside Railway Society, our club, which was based at Tilbury Riverside above the BRSA club in the station building (before it closed). After the station closure the layout was adopted by the Nottingham club, as by then one of our members had mo...
by Gordon H
Fri Nov 30, 2018 4:17 pm
Forum: Personal Layouts - Planning
Topic: New Layout Ideas - Carstairs Inspired Layout
Replies: 24
Views: 1721

Re: New Layout Ideas - Carstairs Inspired Layout

You might like to see the complete track plan of the original Nottingham/RRS Carstairs layout. This is derived from the individual paper sheets produced by hand for each baseboard, and combined into a single image - long before it was possible to do it with any readily available CAD package. The lay...
by Gordon H
Wed Nov 07, 2018 12:58 pm
Forum: Electronics
Topic: Aruino RS485 point control
Replies: 3
Views: 520

Re: Aruino RS485 point control

Not specifically for servos, and certainly not using Arduinos, but RS485 has been used in model railways for many years. Lenz XBus (now Expressnet) is an obvious example. One of the main considerations for point operation will be the number of RS485 receivers you can connect together in the network....
by Gordon H
Sat Oct 20, 2018 2:37 pm
Forum: Items Wanted
Topic: Track
Replies: 5
Views: 322

Re: Track

crazypotter wrote:Sorted now. Big thumbs up to the responders!.

So long as the responders are thinking in the same scale as you - I saw no mention of what scale was being asked for.

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