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| A low-tech LED solution...BUT - Electrics - DC - Getting You Started. - Your Model Railway Club | ||||||||||
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Chubber Casseroled Badger 
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I'd like to one use these - https://www.railwayscenics.com/single-cr2032-cell-button-battery-holder-with-switch-p-3593.html to power LEDs in one of my remote structures to avoid the need for yards of electric string., so with a spare CR2032 battery tried to light a white 3mm LED. No joy. I tried a 3mm red LED, bingo! It worked. Now both work equally well on my 12V LED power source, with either one or two in-line 680K resistors [Bright and duller]. Why? Are the white ones like a flourescent tube, i.e. need a 'kick' to start shining? Unilluminated Chubber ____________________ 'You may share the labours of the great, but you will not share the spoil...' Aesop's Fables "Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin In the land of the slap-dash and implausible, mediocrity is king |
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amdaley Full Member 
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White Led's need about 3.5volts while Red led's need only 1.7 to 2.3 volts.There's some information on the various voltages needed here. https://kithub.cc/2015/11/how-many-volts-are-needed-to-power-an-led-2/ Tony. ____________________ "The only stupid question is the one you don't ask" Regards. Tony. |
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Chubber Casseroled Badger
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Oh! Thanks for your reply, Tony, does this mean that I can't use one of these holders for white lights, then? There is a double CR2032 holder available, not much bigger, but that would give about 6V so I'd be into the resistor scenario again, wouldn't I? Douglas ____________________ 'You may share the labours of the great, but you will not share the spoil...' Aesop's Fables "Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin In the land of the slap-dash and implausible, mediocrity is king |
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amdaley Full Member
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Chubber wrote: Oh! Thanks for your reply, Tony, does this mean that I can't use one of these holders for white lights, then? There is a double CR2032 holder available, not much bigger, but that would give about 6V so I'd be into the resistor scenario again, wouldn't I? I don't know Douglas as I normally use a dc power supply to power leds with a resistor between each led & power supply. If you used two 3 volt batteries, that would give you 6 volts which would need a small resistor. Tony. ____________________ "The only stupid question is the one you don't ask" Regards. Tony. |
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Sol A modelling Moderator. 
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So using a 6v source & the nominal current of 20mA for white LEDs, you need a 135 ohm resistor 1/4 watt.
____________________ Ron NCE DCC ; 00 scale UK outline. |
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Chubber Casseroled Badger
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Thank you, Ron, guess I shall have to source some. I presume to get a more dull glow(bedroom) I could put two in series. D ____________________ 'You may share the labours of the great, but you will not share the spoil...' Aesop's Fables "Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin In the land of the slap-dash and implausible, mediocrity is king |
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Petermac Moderator 
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If you're lighting your bedroom with a 6v LED, I think you'll also need to keep a torch handy Doug .............................  ____________________ 'Petermac |
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gastwo Member 
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Thanks for the link to that battery holder Doug. Useful piece of kit, and a reasonable price, too. Best regards, Shaun. |
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Chubber Casseroled Badger
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Petermac wrote: If you're lighting your bedroom with a 6v LED, I think you'll also need to keep a torch handy Doug ............................. ...I am not currently at home to Mr Silly... D ____________________ 'You may share the labours of the great, but you will not share the spoil...' Aesop's Fables "Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin In the land of the slap-dash and implausible, mediocrity is king |
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Barchester Administrator 
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Chubber wrote: Petermac wrote:If you're lighting your bedroom with a 6v LED, I think you'll also need to keep a torch handy Doug .............................  |
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| This is topic ID = 16629 Current time is 09:37 am |
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