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.

     12V 2A Linear Power Supply
     5V Power Supply With Overvoltage Protection.
     Transformerless Power Supply
     1.2-36V 5A Adjustable Power Supply with LM317
     SG3525 DC Converter 12V to +35V,-35V
     Workshop Power Supply
     TPS54232 Constant Current Source
     Adjustable Lab Power Supply 0-30V 0-3A
     Fully Adjustable Power Supply
     3.3V and 5V Power Supply

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