Time_delay_with_constant_charging_current

Published:2009/7/22 3:51:00 Author:Jessie | From:SeekIC

This circuit shows the basic UJT building block (Fig. 9-1), which is used to provide a time-delay function, where the charging current is constant and relatively small (less than 1 μA). This is done by replacing the basic RE, with a JFET and 10-MΩ pot. The 1-μA constant-charging current provides time delays up to about 10 min.



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