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The Formula. R = (Supply voltage - LEd forward voltage)/LED current. = (3.7 - 3.3)/100 = 0.4/0.1 = 4 ohms. The required wattage would be 0.4 x 0.1 = 0.04W, so a 1/4 watt resistor would be more than enough. Assuming the cell to be rated at 800mAH, with 5 LEDs, the approximate back up time available from the cell could be calculated using the.
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\$\begingroup\$ The battery has 4.2 Volts when fully charged. I need the threshold to be 3.3 Volts and so I would use a 3.3 volt zener diode. Since the negative input should also get the 3.3 volt, I would use R2 and R3 such that R3/R2=33/9.
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Hello everybody. I'm complete newbie to electronics, yet I would like to build simple and effective bicycle light. The components are: 1. 1 x 3.7V, 350mAh, 25C LiPo battery 2. 3 x 3.4V, Ultra-bright, 5mm, 18000mcd, 20mA LEDs 3. 1x 22 Ohms resistor 4. 1 x latching switch My questions are: 1.
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Bluejets. Oct 5, 2014. 6,752. Jan 31, 2022. #2. Adding the extra cell for more run time would mean adding the cell in parallel to the existing cell. Still have 3.7v.trying to run anything 12v from a 3.7v source would vary, depending on exactly what the 12v load consisted of, any result from dimwit to simply will not work.
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