Amateur radio has been somewhat slow to accept switching power supplies for powering communication equipment. This is a pity, because "switchers", as they are often called, offer very attractive features, like small size, low weight, high efficiency, and low heating. True, they are generally more complicated than linear power supplies, but this is easily compensated by the fact that they can be built for a lower cost. Some early switchers produced an objectionable amount of RF noise, bringing the whole switching technology into bad reputation. But by proper design techniques and careful EMI filtering it is possible to build very quiet switchers.

     Adjustable Bench Power Supply
     1.2-36V 5A Adjustable Power Supply with LM317
     1.3 - 32 V / 5A Power Supply with Short Circuit Protection
     12V 2A Linear Power Supply
     3.3V and 5V Power Supply
     Dual Adjustable Power Supply
     Split Laboratory Power Supply
     Repairing Switching Power Supply
     Portable Variable Bench Power Supply 1-32V 0-5A
     DIY Bench Power Supply

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