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| Emergency light and low voltage cutoff circuit |
Using forward voltage drop of LED to protect lithium ion battery from getting too low.
The light will be cutoff around 3 volts.
The upper limit voltage of eight chip LED is higher than battery, no need to add current limit resistor.
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| Emergency Light NPN PNP 1W LED Low Voltage Protection |
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| Emergency light npn pnp perfboard |
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| Emergency light npn pnp usb power two led |
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| Emergency light npn pnp 18650 li-ion two led ON |
