Touch lighting switch circuit 2

(2) Touch lighting switch circuit 2
    The circuit is shown in Figure 2-52. It is controlled by 555 time base integrated circuit A, and the executive element is relay KA. When the hand
touches the conductive sheet Mi, the relay KA is closed and the light EL lights up; if you want to turn off the light, just touch the conductive sheet M2,
the relay is released and the light goes out. Through the contacts of relay KA, high-power electric lights can be driven.