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.

     LM317 Overvoltage Protection
     Transformerless Power Supply
     Split Laboratory Power Supply
     12V Power Supply - 30A
     Adjustable Lab Power Supply 0-30V 0-3A
     High Current Regulated Supply By LM317
     15V / 28V 4A Transmitter Power Supply
     1.3 - 32 V / 5A Power Supply with Short Circuit Protection
     1.2-36V 5A Adjustable Power Supply with LM317
     12V Dual Power Supply

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