0000033℃_CHOPPER_STABILIZED_OVEN_CONTROL

Published:2009/7/8 3:18:00 Author:May | From:SeekIC

Uses chopper-stabilization techniques to provide ultimate in temperature control for laboratory oven. Multiranging bridge accommodates sensols from 10 ohms to 1 megohm, with Kelvin-Valley divider being used to dial sensor resistance control point directly to five digits. Use of floating power supply for bridge allows single-ended noninverting chopper-stabilized AD741J amplifier to take differential measurement and eliminates commonmode voltage elror. Passive 60-Hz notoh fittel eliminates pickup noise at input of AD261K amplifier which in turn feeds 2N2222A transistor driving Darlington pair that provides up to 30 V across heater of oven. Article also gives circuit of 30-V regulated supply required for output transistors.-J. Williams, Designer's Guide to: Tempelature Contlol, EDN Magazine, June 20, 1977, p 87-95.



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