Calculating Resistor Value for 8 White LEDs Dark Detector Circuit on 3.7V Battery

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#1 21674467 14 Jul 2015 06:30

Avijit Panja Avijit Panja

Anonymous

Post #1
21674467 14 Jul 2015 06:30

Hi,
I want to run 8 nod white LED as a dark detector ckt using a 3.7 volt old mobile battery.How to calculate the value of resistor using this ckt.
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#2 21674468 14 Jul 2015 18:50

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21674468 14 Jul 2015 18:50

Hi

I tried searching the net for a possible circuit of a Dark Detector Circuit since you didn't sent one. But never the less, to compute for the resistance, you would just have to know ohms law, more specifically equivalent resistance. So if you have a load which in this case is the White LED, the resistance of the LED is equivalent to the total resistance without the LED. That is what you call the equivalent resistance.

Cheers
#3 21674469 15 Jul 2015 02:18

Avijit Panja Avijit Panja

Anonymous

Post #3
21674469 15 Jul 2015 02:18

component I have used

1. LDR
2.D880 transistor
3.8 nos white LED(each 20 mA and 3.3 volt)
4. 3.7 volt battery
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Calculating Resistor Value for 8 White LEDs Dark Detector Circuit on 3.7V Battery

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