elektor special power supplies and batteries pdfWhatever the methods or even then financial means you have to make your circuits work, the power supply should rank high if not Number One in your considerations. The design block simply called power supply is hugely underrated both in electronics creation and repair. Yet, the PSU has enormous diversity and comes in wildly differing guises like AC DC, generator, battery (rechargeable or not), PV panel, benchtop, linear or switch mode, to mention but a