Search found 212 matches

by Gordon H
Mon Mar 14, 2016 12:42 pm
Forum: DCC Forum
Topic: Does anyone know
Replies: 26
Views: 2362

Re: Does anyone know

Some four or more years ago I asked the NMRA as to why was 3 the default address number rather than 1 etc? Having previously asked the same question on a couple of forums and got no sensible answer. The NMRA did reply saying they didn't know! I suspect you really need to ask Berndt Lenz, the origin...
by Gordon H
Fri Mar 11, 2016 8:55 am
Forum: Electronics
Topic: Reducing LED brightness
Replies: 10
Views: 1475

Re: Reducing LED brightness

End2end wrote:Could this pot be left in the circuit so you could manually change the brightness at any time?

Probably best to keep a 1k fixed resistor in series with the pot though, otherwise you might accidentally turn it down to zero and blow the LEDs.
by Gordon H
Sat Feb 13, 2016 1:50 pm
Forum: Electronics
Topic: Confused with resistance and LEDs
Replies: 13
Views: 1573

Re: Confused with resistance and LEDs

Go for Metal Film, 1% and 0.25W. The metal film ones are in my experience more reliable than Carbon, the minimal extra cost is worth the peace of mind that it will work! If temperature of the resistor is a problem you might like to use the 0.4W ones which are bigger and should not get so hot. Perso...
by Gordon H
Sat Feb 13, 2016 9:57 am
Forum: Electronics
Topic: Confused with resistance and LEDs
Replies: 13
Views: 1573

Re: Confused with resistance and LEDs

There are a number of ways to calculate what rating of resistor is needed. If your supply is 12V, and the LED has a forward voltage of 3V, your resistor will be dropping 9V of the 12V available. Assuming you stick with the 680 Ohm resistor value, the resistor will be passing 9V / 680 Ohms = 13.2mA a...
by Gordon H
Sat Feb 13, 2016 9:41 am
Forum: Electronics
Topic: Wiring multiple 3v LED's to 12v DC
Replies: 8
Views: 2572

Re: Wiring multiple 3v LED's to 12v DC

Is there anything that can be done to stop retailers selling LEDs based on the notion of 'voltage rating'? I guess it is because many of them still don't understand that these things are not like passive filament bulbs which are intended to run from a defined voltage supply. Alternatively, they may ...
by Gordon H
Tue Feb 09, 2016 8:06 pm
Forum: Electronics
Topic: Resistors for battery powered LEDs ?
Replies: 14
Views: 1884

Re: Resistors for battery powered LEDs ?

It is far better to wire LEDs in parallel each with its own series resistor, after all resistors are probably the cheapest electronic component and saving a few pence on a handful of resistors seems illogical. Except - your batteries won't last so long if the LEDs are all paralleled as they are hav...
by Gordon H
Tue Feb 02, 2016 12:41 pm
Forum: DCC Forum
Topic: DCC locos on DC track
Replies: 13
Views: 1289

Re: DCC locos on DC track

NEVER put a DCC loco on a DC track for any length of time even if DC enabled as even though the motor is not being commanded to run either way by a biased DCC signal it is still seeing the full (pseudo) 15V AC of DCC all the time . I think you need to revise this posting, because as it stands it ma...
by Gordon H
Tue Jan 05, 2016 12:42 pm
Forum: DCC Forum
Topic: DCC points controller
Replies: 15
Views: 2224

Re: DCC points controller

From a friend who acts as one of their "assembly elves". It may be done at a group level but they are doing enough to do batches for stock. MERG does not have any 'assembly' elves, only kit packing elves, so this must be a private arrangement outside of the main organisation. I am not awa...
by Gordon H
Mon Jan 04, 2016 12:33 pm
Forum: DCC Forum
Topic: DCC points controller
Replies: 15
Views: 2224

Re: DCC points controller

Bufferstop wrote:...now that you can get their modules ready assembled...

Where did you get that idea from?
Not as far as I know.
by Gordon H
Tue Dec 15, 2015 8:18 am
Forum: N Gauge Model Railway
Topic: software ?
Replies: 8
Views: 1080

Re: software ?

Anyrail most certainly does cover N Gauge.
It is the only thing I use it for, when designing Kato Unitrack demonstration tracks.
Version 5 also includes T Gauge, Lego and Scalextric!
by Gordon H
Sun Dec 06, 2015 12:04 pm
Forum: General Model Railway Discussion / News
Topic: Not sure about joining my local model railway club.
Replies: 23
Views: 2714

Re: Not sure about joining my local model railway club.

Perhaps it is equally important is to find a club whose members have similar modelling interests to yourself, or at least related by era, prototype or technology. The age question is naturally likely to crop up with this type of consideration too. When I joined my local club over 40 years ago the ma...
by Gordon H
Fri Dec 04, 2015 9:08 am
Forum: DCC Forum
Topic: Recent DCC advances?
Replies: 44
Views: 4547

Re: Recent DCC advances?

There is far less hardware involved, because there is no trackside hardware system at all, other than the throttle (phone, tablet etc,) and a simple track power supply (peanuts in cost terms). The equivalent trackside controller is a software app, running on the Smart device. On cost, your consider...
by Gordon H
Thu Dec 03, 2015 9:43 pm
Forum: DCC Forum
Topic: Recent DCC advances?
Replies: 44
Views: 4547

Re: Recent DCC advances?

The onboard decoder has a bluetooth circuit control board as part of it or may be retrofitted, I believe, to existing decoder equipped locomotives. Constant power is supplied directly to the track and the app on a smart phone or tablet is used to drive the locomotive. There is no 'trackside' DCC co...
by Gordon H
Thu Dec 03, 2015 12:27 pm
Forum: DCC Forum
Topic: Recent DCC advances?
Replies: 44
Views: 4547

Re: Recent DCC advances?

GWR_fan wrote:The main advantage I see is that no DCC controller is required. Power is supplied to the track and bluetooth does the rest.

How does 'bluetooth' know what needs doing?
Possibly via a controller of some kind?
by Gordon H
Tue Dec 01, 2015 12:43 pm
Forum: General Model Railway Discussion / News
Topic: Cheap DIY automatic electronics as used on PAWFORD
Replies: 23
Views: 3411

Re: Cheap DIY automatic electronics as used on PAWFORD

Geoff wrote:Thank you for that, but it doesn't tell me what I was doing incorrectly when I tried to convert the words "your Station Stop circuit diagram" into a hyperlink.

All I did was find the drawing in the original thread, right clicked over it and copied the URL that appeared into my message.

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