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13.8-V power supply for mobile rigs

13.8-V power supply for mobile rigs
At the heart of this power supply is the type 723 voltage regulator. Despite its age, the 723 is still popular among radio amateurs because it is reliable, widely available and far cheaper man many of the latest high power (> 1.5-A) three-terminal voltage regulators, even if you add the cost of two or three 2N3055-like current booster transistors (which many of you will be able to raise from junkbox).
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