What does this diode do please?

kingswood

kingswood

@kingswood-djbM8g • Oct 23, 2024

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!

[​IMG]

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  • Munguti

    Munguti

    @munguti-MnxkmE • Aug 24, 2008

    i think it limits the voltage across the 2.7k resistor to 24-2.1v=21.9v

    0
  • Ashraf HZ

    Ashraf HZ

    @Ash • Aug 24, 2008

    LEDs are generally used for indication purposes, so my guess is that its just an indicator. 2.7K resistor is used for protection purposes 😀

    0
  • kingswood

    kingswood

    @kingswood-djbM8g • Aug 25, 2008

    thanks guys i appreciate the help

    0