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Audio and Video Talk
The Vintage Audio Section
Advice Required: Where To Source VU Meter Lamps For Marantz 4100
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<blockquote data-quote="marantz123" data-source="post: 793137" data-attributes="member: 16849"><p>Hi Vishen</p><p></p><p>The resistor value is based on a simple formula involving two things : the voltage drop rating of the LED that you use and the current that you want it to run at. Standard voltage drop ratings for leds are 1.5v and 3v with 1.5v types being more versatile. The current can be anything from a modest 8mA to 25mA, with some superbright leds having 35mA capability. You can experiment with currents a bit but i have found that 12mA gives good life on an led and is as bright as 15mA which is more the standard current vs longevity combination. The formula is (supply voltage - led volt drop rating)/chosen current (12mA) = resistor value. 0.25w resistor power rating should be fine here.</p></blockquote><p></p>
[QUOTE="marantz123, post: 793137, member: 16849"] Hi Vishen The resistor value is based on a simple formula involving two things : the voltage drop rating of the LED that you use and the current that you want it to run at. Standard voltage drop ratings for leds are 1.5v and 3v with 1.5v types being more versatile. The current can be anything from a modest 8mA to 25mA, with some superbright leds having 35mA capability. You can experiment with currents a bit but i have found that 12mA gives good life on an led and is as bright as 15mA which is more the standard current vs longevity combination. The formula is (supply voltage - led volt drop rating)/chosen current (12mA) = resistor value. 0.25w resistor power rating should be fine here. [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Advice Required: Where To Source VU Meter Lamps For Marantz 4100
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