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Versatile and comfortable passive pre-amp

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Rudi_Ratlos

Rudi_Ratlos

Member
Joined 2009
This is a simple calculation Patrick:

The forward voltage drop across a any (?) LED is about 2V. So 3V remain to drop across the resistor. Take a 3 KOhm resistor and 10mA will be flowing (the LED will then shine very bright!), take a 6.8 KOhm resistor and some 5mA will be flowing (still very bright) - so I advise you take a 10 KOhm resistor.

Best regards - Rudi
 
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