The transistor lat

This circuit, it works similar to a SCR.When the trigger input is high, The transistor Q2 and Q1 will work,therefore a current flow to the base pin of Q2,it has voltage 0.7 volts at resistor R1.
When cutting the activation voltage, the transistors can continue to perform, because the base current.The reset circuit will do this by cutting the power supply circuit for a while, with the switch Reset button only.

Transistor lat

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