TOUCH_SENSITIVE_SWITCH

Published:2009/6/24 22:56:00 Author:May | From:SeekIC

A high impedance input is provided by Q1, a general purpose field effect transistor. 741 op amp is used as a sensitive voltage level switch which in turn operates the current Q2, a medium current PNP bipolar transistor, thereby energizing the relay which can be used to control equipment, alarms, etc.



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