Build a usb power bank
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Julian’s postbasket #149 – electrics and electronics
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Supercapacitor speaker endurance test
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Supercapacitor optoisolator full charge detector
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Supercapacitor protection pcb modification
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Pwm5 femto v2 solar charge controller construction
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Pcbs from jlcpcb: solar charge controller pwm5 femto v2
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Hp server psus – 12 volts – lots of amps
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Cute lcd buck/boost with digital on/off
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Ammeter for workshop battery powers the lights
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