choosing a thyristor

dexter001

New Member
I am making a laser door alarm in which whenever somebody breaks the laser path, a continuous alarm should be generated. Although the design which i used is working properly, the problem is that buzzer only beeps when somebody breaks the laser beam and stops as soon as the laser beam falls on the phototransistor again.
A thyristor can be a perfect choice for solving the problem. But I don't understand how to choose the correct model of a thyristor for a particular circuit (especially where it is used for latching)
The circuit design is similar to what is given here:
electroschematics.com/4929/laser-based-door-alarm
 
C106 is a sensitive gate "logic" SCR.
 
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