MOSFETs only need a voltage to switch on and off. That makes for a nice digital switch.

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Quick BS250 E line package P channel enhancement mode MOSFET switch circuit by electronzap







Portable solar panel with 5V USB output. I find it better to use the panel to charge a portable power bank, which can then be used to charge a cell phone, than to try to charge a cell phone directly.



One of my favorite portable power banks, this one has a better display than my version.

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