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.

     1.3 - 32 V / 5A Power Supply with Short Circuit Protection
     30V/4A Adjustable Bench Power Supply
     1.2 - 12V / 1A Low Voltage LED Indicator Power Supply with LM317
     SG3525 DC Converter 12V to +35V,-35V
     +/- 15V Power Supply
     Bench Power Supply
     Fully Adjustable Power Supply
     13.8V 10A Power Supply
     Transformerless Power Supply
     5V Power Supply With Overvoltage Protection.

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