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.

     30V/4A Adjustable Bench Power Supply
     30V 10A Variable Bench Power Supply
     1.5V - 30V 1.5A LM317 Variable Power Supply
     13.8V, 40A Switching Power Supply
     LM317 Constant Current Source Circuit Design
     15V / 28V 4A Transmitter Power Supply
     12V 2A Linear Power Supply
     1.2 - 12V / 1A Low Voltage LED Indicator Power Supply with LM317
     Variable Laboratory DC Power Supply
     1.2-36V 5A Adjustable Power Supply with LM317

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