3v supply
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3v supply
by airflamesred » Sun Jul 29, 2012 7:56 pm
Where could I extract 3v to power the on off switch illumination? I guess I need a resistor as well. Any ideas?
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Re: 3v supply
by dmitri » Sun Jul 29, 2012 9:52 pm
Is it a LED illuminated switch? You can use 5V via a current limiting resistor.
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Re: 3v supply
by airflamesred » Mon Jul 30, 2012 7:43 pm
Thanks Dmitri. What size would the resistor be?
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Re: 3v supply
by dmitri » Mon Jul 30, 2012 9:02 pm
Depends on the LED's specs.
R = (5V - LED's Forward Voltage) / (Desired LED's Forward Current)
Desired LED's Forward Current depends on the LED's specs and desired luminance intensity/power consumption.
See http://ledcalc.com/
R = (5V - LED's Forward Voltage) / (Desired LED's Forward Current)
Desired LED's Forward Current depends on the LED's specs and desired luminance intensity/power consumption.
See http://ledcalc.com/
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Re: 3v supply
by airflamesred » Mon Jul 30, 2012 9:37 pm
Thanks that looks useful.
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