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by Tricky Dicky
Thu Mar 10, 2016 11:27 pm
Forum: Electronics
Topic: Reducing LED brightness
Replies: 10
Views: 1158

Re: Reducing LED brightness

End2end wrote:
Flashbang wrote:Alternative if you have one wire a 10k or 22K linier pot in series and adjust the pot up/down to see what the brightness alters by.

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


Yes

Richard
by Tricky Dicky
Tue Mar 01, 2016 4:50 pm
Forum: General Model Railway Discussion / News
Topic: Garage Dwellers Help Required....
Replies: 9
Views: 697

Re: Garage Dwellers Help Required....

When it comes to insulating the single brick walls, waterproofing them on the inside may cause you more problems. The problem is not water coming from outside but condensation inside. Put a vapour barrier on a cold surface will simply cause moisture in the air to condense on that surface with nowher...
by Tricky Dicky
Fri Feb 19, 2016 3:36 pm
Forum: Electronics
Topic: Live frog switching
Replies: 5
Views: 910

Re: Live frog switching

A simple micro switch connected to the tie bar is all you need. Connect the common (COM) to the frog and the (NC) and (NO) to the track feeds. With the tie bar pressing the micro switch actuator at one end of its movement the normally closed terminal (NC) will be disconnected and the normally open (...
by Tricky Dicky
Mon Feb 15, 2016 1:48 am
Forum: Electronics
Topic: Wiring multiple 3v LED's to 12v DC
Replies: 8
Views: 1488

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

OK but I'm still having a hard time understanding all this milliamp stuff. That is quite understandable, with bulbs being rated by voltage it is a simple halve the voltage and the bulb will dim. Put two 12V bulbs in series with a 12V supply and the voltage will be divided equally across each bulb. ...
by Tricky Dicky
Sun Feb 14, 2016 2:45 pm
Forum: Electronics
Topic: Wiring multiple 3v LED's to 12v DC
Replies: 8
Views: 1488

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

http://www.electronics2000.co.uk As nobody actually answered my question I've actually tried it out for myself and found that YES.I can run multiple LED's off one resistor. Suzie did and there was no further need to add to her excellent answer Thanks for all the mind boggling formulas and theories. ...
by Tricky Dicky
Sat Feb 13, 2016 8:10 pm
Forum: Electronics
Topic: Wiring multiple 3v LED's to 12v DC
Replies: 8
Views: 1488

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

Is there anything Anyway, LED operation is defined by the current that flows through them, not the voltage across them as such. The so-called 'voltage rating' is merely a consequence of passing this current through the LED, which is a non-linear semiconductor device. LEDs, like any other diode, exh...
by Tricky Dicky
Wed Feb 10, 2016 9:27 am
Forum: Electronics
Topic: Resistors for battery powered LEDs ?
Replies: 14
Views: 1313

Re: Resistors for battery powered LEDs ?

Gordon, I agree about current draw especially with a battery powered circuit but the advice was given having in mind that the OP admitted he was inexperienced. In this instance having found the value of resistor he was happy with, adding further LEDs was a simple matter of using the same components ...
by Tricky Dicky
Tue Feb 09, 2016 2:54 pm
Forum: Electronics
Topic: Resistors for battery powered LEDs ?
Replies: 14
Views: 1313

Re: Resistors for battery powered LEDs ?

Thanks again to all who have replied. I'm surprised to hear that it makes no difference whether the resistor is connected to the positive or negative wires but electrics are a mystery to me anyway ! If you think of an electric circuit a useful if not strictly accurate analogy is your central heatin...
by Tricky Dicky
Mon Feb 08, 2016 7:39 pm
Forum: Electronics
Topic: Resistors for battery powered LEDs ?
Replies: 14
Views: 1313

Re: Resistors for battery powered LEDs ?

It is possible to connect several LEDs in series and with a single resistor, but with each LED added you have to increase the voltage supplied. 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...
by Tricky Dicky
Sun Feb 07, 2016 5:21 pm
Forum: Electronics
Topic: Resistors for battery powered LEDs ?
Replies: 14
Views: 1313

Re: Resistors for battery powered LEDs ?

With 6V you will definetly need resistors wether the ones supplied are correct for your power source is another matter. At 6V assuming you are using white LEDs which will have a forward voltage of between 3 - 3.5V approx. I would start with a 120R resistor in series with each LED this will limit the...
by Tricky Dicky
Sat Feb 06, 2016 11:16 pm
Forum: Electronics
Topic: Battery powered LEDs - I'm stumped
Replies: 8
Views: 902

Re: Battery powered LEDs - I'm stumped

Many of these battery operated lights can produce various lighting effects, it maybe that you have in effect two strings of LEDs. By removing one wire you may have ended up with LEDs reverse biased to each other hence why nothing lights up. As Bufferstop has suggested you need to carefully unravel t...
by Tricky Dicky
Sun Jan 17, 2016 11:44 am
Forum: N Gauge Model Railway
Topic: New to model railway.
Replies: 17
Views: 1450

Re: New to model railway.

The track is the same but European, US and Japanese stock are smaller than British stock. Off hand I cannot recall the difference in scale but I am sure someone will post the details.

Richard
by Tricky Dicky
Sat Jan 16, 2016 8:41 am
Forum: General Model Railway Discussion / News
Topic: Soldering wire to track.
Replies: 15
Views: 1781

Re: Soldering wire to track.

Like Brit said it sounds as if the rails are dirty or oxidised, either use a screwdriver as already advised or better still a fibre glass pen to clean the area where the wire is to be soldered. Then proceed to solder by tinning the rail and the end of the wire first before bringing the two together ...
by Tricky Dicky
Tue Jan 05, 2016 1:45 pm
Forum: General Model Railway Discussion / News
Topic: Track Cleaning Fluid
Replies: 9
Views: 850

Re: Track Cleaning Fluid

Acetone is usually the main active ingredient of nail polish removers.

Richard
by Tricky Dicky
Mon Dec 14, 2015 12:42 pm
Forum: N Gauge Model Railway
Topic: software ?
Replies: 8
Views: 824

Re: software ?

When you say "virtual" do you mean something to run virtual trains on because in that case scale is somewhat irrelevant? If it is to plan an n gauge layout then Anyrail will do that the only limit on the free download is that you can only use a maximum of 50 track pieces.

Richard

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