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Reload this Page What does this diode do please?
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Old 24th August 2008, 07:01 PM
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Default What does this diode do please?
hello can anyone tell me what the LED in this circuit is for? Is it just a power on indicator or does it do diode related stuff? The 300k resistor is actually a touch sensor grid, with 300k being assumed resistance of human finger.

Thanks heaps for any advice!
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Old 24th August 2008, 08:53 PM
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Default Re: what does this diode do please?
i think it limits the voltage across the 2.7k resistor to 24-2.1v=21.9v
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Old 25th August 2008, 02:29 PM
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Default Re: What does this diode do please?
LEDs are generally used for indication purposes, so my guess is that its just an indicator. 2.7K resistor is used for protection purposes
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Old 26th August 2008, 01:54 AM
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Default Re: What does this diode do please?
thanks guys i appreciate the help
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