Simple NiMH battery charger (with PCB files)
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Super-simple DIY charger for NiMh button cells.
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Charging NiMH cells - smart vs dumb chargers
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Inside a cheapo NiMh charger with schematic.
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eBay trash USB charger 2023 - with schematic
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Simplest 12V Battery Charger for Beginners DIY
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A Low Voltage Vacuum Tube OTL Audio Amplifier
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Simplest solar light possible, using old phone battery.
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