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Adjustable Symmetric 1 to 24VDC, 1A Power Supply - Circuit Scheme
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Adjustable symmetric 1 to 24vdc, 1a power supply
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4-20mA Current Loop Devices | Circuit Cellar
Patent US6320764 - Regulation circuit for a power converter and method
3-30 V/2.5 A Stabilized power supply - Power circuits - ElShem.com