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.

     0-30V Mini Bench Power Supply
     30V 10A Variable Bench Power Supply
     Laboratory Power Supply 0-30 Volt
     Fully Adjustable Power Supply
     15V / 28V 4A Transmitter Power Supply
     5V Power Supply With Overvoltage Protection.
     Split Laboratory Power Supply
     LM317 Power Supply Circuit
     1.3 - 32 V / 5A Power Supply with Short Circuit Protection
     Adjustable Bench Power Supply

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