Search found 109 matches

by fourtytwo
Fri Aug 14, 2020 7:19 pm
Forum: Personal Layouts - Under Construction
Topic: Riccarton Junction in N gauge
Replies: 33
Views: 4356

Re: Riccarton Junction in N gauge

Riccarton Junction is no more, dismantled & sold along with all the stock! This is a sad occasion because IMOP its probably among the best I have ever built at least scenically. I don't know how to explain why I gave up, it could be advancing years and not enough time or energy to do all the thi...
by fourtytwo
Sun Jul 26, 2020 9:05 pm
Forum: N Gauge Model Railway
Topic: Got to start somewhere
Replies: 8
Views: 1792

Re: Got to start somewhere

Morning, I am thinking hard about doing a 25ft x 2ft shelf layout with a helix at either end. This will give me the straight and sweep effect I want and then some. N Gauge has this enormous advantage https://youtu.be/QOcG-Q8Iheo I hate to pour any cold water but I pretty much did this same thing 35...
by fourtytwo
Mon May 11, 2020 8:18 pm
Forum: Electronics
Topic: Has anyone tried Railway Scenic's Stay Alive kits?
Replies: 7
Views: 511

Re: Has anyone tried Railway Scenic's Stay Alive kits?

Am I correct in thinking you mean in conjunction with a DCC layout ?
I tried a few experiments in a DC layout with very limited success as the voltage stored is just the normal motor voltage so the flywheel effect is somewhat limited AND I model N-gauge steam so almost no space in for example a 57xx!!
by fourtytwo
Mon May 11, 2020 8:11 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 2671

Re: Track Circuits (Train on Track Indicators.

sorry to intrude but would this thing be of any use? https://www.auselectronicsdirect.com.au/5a-hall-current-sensor-module-for-arduino-projects No intrusion and its a perfectly valid solution........ I designed my circuit long before such things were available and........ My circuit is far more sen...
by fourtytwo
Mon May 04, 2020 8:53 pm
Forum: Electronics
Topic: Using latching relays in a control panel ??
Replies: 44
Views: 1574

Re: Using latching relays in a control panel ??

What are the LEDs and the resistors doing?? Each Led is inverse to the other! The same as a twin LEDs in one package. AKA Bi LEDs You're not the person. OMG NOOOOOOOOOOOOOO I AM SOOOOOOOOOOO SORRY I just did not study the diagram enough!! The unlit LED has the SAME voltage both ends so of course it...
by fourtytwo
Mon May 04, 2020 8:36 pm
Forum: Electronics
Topic: Using latching relays in a control panel ??
Replies: 44
Views: 1574

Re: Using latching relays in a control panel ??

Hi Suzie is correct re resistors one per LED is ideally needed. My error copying and pasting the two wire method then altering the pasted copy without double checking! That drawing has been deleted. Corrected drawing attached here. Surprised somewhat that you are asking these basic questions? As yo...
by fourtytwo
Mon May 04, 2020 8:27 pm
Forum: Electronics
Topic: Using latching relays in a control panel ??
Replies: 44
Views: 1574

Re: Using latching relays in a control panel ??

End2end wrote:Is there also a way to dim all the LED's?
Thanks
End2end

YES use larger resistor values to reduce current, best to experiment with one LED on the bench first!!
You could also keep the same resistors and reduce the supply voltage.
by fourtytwo
Mon May 04, 2020 8:25 pm
Forum: Electronics
Topic: Using latching relays in a control panel ??
Replies: 44
Views: 1574

Re: Using latching relays in a control panel ??

I've seen something else in the diagram that I am not sure about. From the 12v PSU bus shouldn't the red + wire go to point D and the black - wire go to point E on the PM1? Thanks End2end Having only been briefly acquainted with such motors on club layouts would that not just reverse the indication...
by fourtytwo
Mon May 04, 2020 8:08 pm
Forum: Electronics
Topic: Using latching relays in a control panel ??
Replies: 44
Views: 1574

Re: Using latching relays in a control panel ??

Unfortunately apart from the flaw pointed out by Suzie that would cause a dead short across the power rails through the LEDs resulting in there destruction, the reverse voltage rating of LED's is typically a mere 5V meaning in this application the survival of the unlit LED is a matter of chance rath...
by fourtytwo
Mon May 04, 2020 4:23 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 2671

Re: Track Circuits (Train on Track Indicators.

Hi Albert, sorry for the slow reply So far I have built almost all the 'inside of the box' circuit you provided apart from the last couple of resistors (R4 & R5) that I guess are just there to deliver a voltage around 4 or 5 volts to the OCC line to an Arduino digital in. Yes they are, please do...
by fourtytwo
Mon Apr 27, 2020 10:57 am
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 2671

Re: Track Circuits (Train on Track Indicators.

Hi Albert It's a pleasure. I write all my code for micro-controllers in assembler! guess it comes from when they were truly very small and slow! So I don't know what sort of Arduino you are using nor what language, also there has been much discussion over the terrible boilerplate code offered by chi...
by fourtytwo
Sat Apr 25, 2020 8:54 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 2671

Re: Track Circuits (Train on Track Indicators.

That went past me without slowing down! Any chance of pointing me at a web page that explains it? Pretty please? Hi Albert very sorry for that, here is a link https://www.cc.gatech.edu/~hadi/teaching/cs3220/doc/debounce.pdf Just the same as debouncing a switch, in software I usually generate a suit...
by fourtytwo
Sat Apr 25, 2020 9:40 am
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 2671

Re: Track Circuits (Train on Track Indicators.

Hi Albert Sorry I thought you meant to multiplex the circuits carrying motor currents, as you say if you are only multiplexing the digital signals then a simple TTL/CMOS chip would do the job. One problem you might encounter with multiplexing however is the need for a filter in software (see scope s...
by fourtytwo
Thu Apr 23, 2020 4:01 pm
Forum: Electronics
Topic: Track Circuits (Train on Track Indicators.
Replies: 42
Views: 2671

Re: Track Circuits (Train on Track Indicators.

The A input connects to where? The B input connects to where? Hi Albert, sorry for the slow reply, A & B are simply in series between the PWM and track as shown in the system diagram, as the track circuit is bi-directional it doesnt matter which is which. Does the bias supply have to be exactly...
by fourtytwo
Tue Apr 07, 2020 8:43 pm
Forum: N Gauge Model Railway
Topic: Adding weight to rolling stock
Replies: 12
Views: 1254

Re: Adding weight to rolling stock

I understand the problem, some wagons in particular seem very jumpy indeed so those are the ones I use for fixing bad track! its sometimes to much gap between rail ends or they have been cut badly leaving a ridge, so either some filler, a file or relaying a point usually fixes the problem. The probl...

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