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Solar lantern circuit
It works!
When the voltage coming off the solar cell is high, the battery will charge. When the voltage falls below a threshold, the leftmost transistor will turn off which turns on the second half of the circuit. This amplifies the voltage from the battery (AAA) enough to turn on the LED.
Circuit diagram and thorough explanation: www.talkingelectronics.com.au/projects/SolarLight/SolarLi...
Solar lantern circuit
It works!
When the voltage coming off the solar cell is high, the battery will charge. When the voltage falls below a threshold, the leftmost transistor will turn off which turns on the second half of the circuit. This amplifies the voltage from the battery (AAA) enough to turn on the LED.
Circuit diagram and thorough explanation: www.talkingelectronics.com.au/projects/SolarLight/SolarLi...