Ordinary power supplies are as common as sand on the beach, and even lab power supplies come in all sorts and sizes. These are adequate for many purposes, but if you want high quality, high stability and precise regulation, you have to put out a lot of money-and that for a power supply with only modest output power. Another option is to build one yourself. If you regularly put together electronics projects, a small power supply with an output current rating of around 1 A and an output voltage adjustment range of at least 1 V to 12 V or so can certainly come in handy. That should be enough for most of the small circuits you build yourself. Small adjustable power supplies of this sort with regulated output voltage and an enclosure are available from electronics mail-order companies at low prices, and most of them have displays that show the output current and voltage at the same time.
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