Dave writes –
Sure power supply projects aren’t that sexy; but they are, generally speaking, the foundation for every electronics project. The voltage output for this project is 5VDC, and a practical output that can be applied to a wide variety of digital components. Even better, this power supply has a 2-pin plug that can be quickly and easily snapped into a common 2-pin header for a reliable and solid power connection. Add a pushbutton ON-OFF switch and a USB rechargeable interface and you have a versatile power supply that can be slipped inside your pocket.
HOW TO – Make a Rechargeable, pocket-sized 5V power supply – Link.
2 thoughts on “HOW TO – Make a Rechargeable, pocket-sized 5V power supply”
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Kinda elaborate, but cool. Certain batteries are 1.25 by nature and have very horizontal discharge characteristics. The environmentally disastrous NiCds come to mind, for one. Watch out, ‘though they have nearly no Rth, so current limiting must be provided. The need for precise supply potential is typically the provenance of logic circuits, in this case the common TTL and later metal-gate CMOS types. This requirement is obviated if one uses 74C- and 4000 and 4500 series (self aligning) silicon-gate types, which can run something like 2V to 15V and feature thresholds (1/3, 2/3) that track the supply. Old-school op-amps can feature fairly wide supply ranges as well. CMOS versions, as well as some bipolars, can feature low Q-diss as well. Often it is better to go this route than get Procrustean about the PS.