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MintyBoost – Small battery-powered USB charger
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Lemon Power – Make a Battery From a Lemon
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Simple Car Battery Charger
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Battery-powered Headphone Amplifier
Circuit trade-offs minimize noise in battery-input power supplies
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AA Battery Solar Charger
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Automatic 12V Lead Acid Battery Charger
USB Powered Lithium Ion Battery Charger by LM3622
Li ion Battery Charger for Mobile phone by TL431
Atmel Solar Panel Battery Charger by ATtiny13V
Economic Battery Sufficiency Tester by BC547
Battery Powered Lighting using Super Bright LEDs
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