Lockout shooting, due to the incidence of light, can be achieved with the circuit in the figure. In this case, the lighting of the phototransistor causes the transistor to be polarized to conduct the current, which leads the SCR to trip. The SCR activates the relay, which is kept in this condition even after the photosensor current has disappeared. To reset the circuit, the current through the SCR must be interrupted momentarily. This can be done by turning the power off for a moment or short-circuiting the anode and the SCR cathode using a push button.
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