Stage lighting adjustment circuit

Thyristor modules are often used in industrial high-current control situations, such as motor
speed regulation, contactless switches, welding, heating, voltage regulation, voltage stabilization, inverter
power supply, etc. The stage lighting circuit is introduced below. The variable and soft lighting increases
the advertising effect of the show.
    As shown in the figure, it is a stage lighting regulator circuit. The two unidirectional thyristors inside the thyristor
module are connected in reverse parallel, which is
equivalent to a bidirectional thyristor. VT1 and VT2 form a pulse trigger circuit.
By adjusting the 300kn potentiometer in the figure, the conduction
angle of the trigger thyristor can be changed, thus changing the brightness of the light .