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Battery Level Indicator Circuit
Many Simple LED AC mains voltage & current indicator circuits
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debugging - Power indicator for circuits with voltages much higher than LED forward voltages (say 15-48V) - Electrical Engineering Stack Exchange
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Battery Level Indicator Circuit using LM3914
Many Simple LED AC mains voltage & current indicator circuits
Simple Battery Level Indicator Circuit | Electronic Schematic Diagram
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Main power supply Indicator circuit
Many Simple LED AC mains voltage & current indicator circuits
