The circuit for the Windmeter is self powered. A 12v solar cell array provides power to the circuit and charges the battery during the day. At night the 12v battery is used to power the circuit. Operation for many days without sunlight is required, so the circuit operates at 3.3v and uses a high efficiency switching power supply. The circuit draws 1.35 mA at 12v. The circuit should operate for
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Electronic Projects
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