Crystal_oven_control_circuit

Published:2009/7/22 0:33:00 Author:Jessie | From:SeekIC

This circuit combines an LT1005 multifunction regulator and a typical commercial crystal oven to prevent equipment use until oven temperature has stabilized (as is often required in precision test equipment). When power is applied, pin 6 of the crystal oven is high, which biases Q1 on. Simultaneously, the SCR gate is triggered by the current flowing through the 4.7-kΩ resistor (the 4.7-μF capacitor charge current). This turns the SCR on and allows the load (the LT1005 enable pin) to receive power. The 4.7-kΩ resistor eliminates false SCR triggering, and the diode suppresses reverse gate current when LT1005 input power is removed.



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