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VARIABLE_25_10_V

2014-11-22 03:07  
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VARIABLE_25_10_V
General-purpose opamp and tenet, operating from single 15 V supply, serve as stable buffered voltage reference source that is readily adapted to wide range of output voltages and currents. R4 applies some fraction of zener's 2.5 V to opamp, which amplifies it by factor of 4 to give 2.5 to 10 V output. Output current rating depends on opamp and is about 10 mA for general-purpose types. 759 will handle up to 350 mA, and other devices can be buffered with NPN emitter-follower stage. For greater output range, use higher supply voltage and ad just R2 accordingly. R3 should be chosen to maintain about 1 mA in zener.-W. Jung, An IC Op Amp Update, Ham Radio, March 1978, p 62-69.