Textile warping machine light-controlled automatic starting circuit

Light-controlled automatic starting circuit : The schematic diagram is shown in the figure. When the driver
just steps on the foot pedal, his foot blocks the light, the photoresistor RG shows high resistance,
the voltage drop on RG increases to the starting voltage of the control end of the integrated switching circuit IC 1, and IC 1 is turned
on. The relay Kl is closed, its normally open contact Kl (see Figure 7-7) is closed, the AC contactor
KM is energized, its normally open contact KM is closed, and the motor works. While the contactor KM
is closing, the power transformer T is working. The AC voltage on the secondary side of T is rectified, filtered
and stabilized , and a stable 5v DC working voltage is output.