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13_V_AT_2_A_WITH_NPN_TRANSISTORS

2016-05-07 09:46  
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13_V_AT_2_A_WITH_NPN_TRANSISTORS
Q1 is reference voltage source and Q2 is series-pass regulator for basic supply suitable for running mobile FM transceiver or other 12-V portable equipment in home. Transformer secondary is 16-19 V, or can be 6-V and 12-V filament transformers in series. R1 protects rectifier diodes from surge current generated when supply is turned on. Article tells how to adapt circuit for other output voltages.-R. B. Joerger, Power Supply, 73 Magazine, Holiday issue 1976, p 40-41.