Car turn indicator circuit

When the car turns, the direction indicator lights flash one after another to indicate the direction of the turn, so as to attract the attention of passing vehicles and pedestrians.
The working principle of the car turning flash indicator circuit is shown in Figure 16-38. VT1 and VT2 form an astable circuit. When Sl is closed, the
astable circuit starts to work. Since VT1 is constantly on and off, the relay K continuously attracts and releases, turning the indicator light circuit on and
off, and the light emits a flashing light. When S2 is on "1", the left light of the car will light up; when Sz is on "2", the indicator light on the right side of the car will be on. ~