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Old 20th August 2013, 11:59 PM   #11
Minion is offline Minion  Canada
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2.7K is the perfect value to give your 6v led 10ma .
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Old 21st August 2013, 12:48 AM   #12
davym is offline davym  Scotland
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Thanks Minion.
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Old 21st August 2013, 01:31 PM   #13
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You can use the resistors you got for the LED. It will shine slighly brighter than with 2.7k.
As long as the LED can handle 20mA you can go down to 1.2K. The bigger the resistor is the less light the LED will give. I don't like if a LED shines my face off when I only want to see if it is turned on or not.
You can also use one 4.6K res also for testing.
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Old 21st August 2013, 02:03 PM   #14
davym is offline davym  Scotland
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Thanks mrWagner, I know what you mean about bright led's too, I don't like that either.
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Old 21st August 2013, 02:39 PM   #15
AndrewT is offline AndrewT  Scotland
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1mA to 2mA may give enough light output for an ON indicator.

10mA to 20mA is getting very near the absolute maximum current the LED can take without blowing up.
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Old 21st August 2013, 02:55 PM   #16
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I tried to look after the min current, but couldn't find much.
Then I'll start with 20-22k for my +-22v system.
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Old 21st August 2013, 02:58 PM   #17
AndrewT is offline AndrewT  Scotland
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They generally don't specify minimum.

Just connect your LED with a variety of test resistors to a 9V battery (or a lab supply) and see what 1mA, 2mA, 4mA looks like.
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Old 21st August 2013, 03:09 PM   #18
Mooly is offline Mooly  United Kingdom
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Many a true high brightness LED is more than bright enough at 300ua or less. For a panel indicator they would be to bright even at that.
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Old 21st August 2013, 04:51 PM   #19
davym is offline davym  Scotland
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Looks like i'll have to try a few values to find the best one, thanks folks.

Davy
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Old 22nd August 2013, 02:04 AM   #20
Minion is offline Minion  Canada
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I think the 2.7k will be fine , while it will deliver 10ma the actual current going to the LED will be a bit lower as the resistor that is built into the switch will eat up a couple ma .... at 8ma the diode will be bright but still at a lower current than it is rated for ...

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