13_V_AT_2_A_WITH_PNP_TRANSISTORS_Circuit Diagram World 
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2016-05-09 07:55  
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Reference voltage source q1 is 2N301, while series-pass regulator Q2 is 2N1523 D5 is 1N5245 15-V zener Secondary of T1 is 16-19 V, or can be 6-V and 12-V filament transformers in series. Article tells how to adapt circuit for other output voltages. - R. B. Joerger, Power Supply, 73 Magazine, Holiday issue 1976, p 40-41.