Incandescent lamp dimming circuit using thyristor part 4a

(4) The fourth incandescent lamp dimming circuit using thyristor
    The circuit is shown in Figure 2-69. This circuit uses a bidirectional thyristor and a switch potentiometer, which is often used for dimming desk lamps.
Figure 2-69 (b) is the Pisces brand JC51 desk lamp. The circuits
of other desk lamps such as the Star brand SBT-180 and the Zhongya brand SBT-
254 are also similar to this figure. In the figure,
the inductor L and the capacitor Cl are Anti-interference effect.