PROPORTIONING_CONTROLLER

Published:2009/7/7 22:50:00 Author:May | From:SeekIC

National LM122 timer is used as proportioning temperature controller with optical isolation and synchronized zero-crossing. R2 is used to set tem-perature to be controlled by thermistor R1. SCR used for Q2 is chosen to handle required load.D3 is rated at 200 V. R12, R13, and D2 implement synchronized zero-crossing feature.-C. Nelson, Versatile Timer Operates from Microseconds to Hours, National S_emiconductor, Santa Clara, CA, 1973, AN-97, p 8.



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