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5_V_AT_75_mA

2015-03-23 21:46  
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5_V_AT_75_mA
Circuit uses single pot with standard opamp to ad just output voltage and simultaneously set current of 6.2-V zener at optimum value for temperature stability. With some opamps, emitter-follower may be needed at opamp output to supply necessary zener current. Technique eliminates need for separate zener current adjustment or permits use of lower-cost zener.-K. Hanna, Single Control Adjusts Voltage Reference, EDN Magazine, June 5, 1976, p 117.