VARIABLE_25_10_V

Published:2009/7/15 21:31:00 Author:Jessie | From:SeekIC

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.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/VARIABLE_25_10_V.html

Print this Page | Comments | Reading(3)