For the locked trigger we also have the circuit shown in the figure. In this circuit we also have the complementary transistors that trigger the SCR. The SCR energizes the relay coil, keeping it in this state until the current is interrupted. Sensitivity control in this circuit can also be added, constituting a 47 k trimpot in series with the resistor. For SCRs of the TIC106 type, it may be necessary to connect, between the cathode and the gate, a 1k resistor.
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