Circular chasing colored light circuit

This example is a novel lantern with a particularly strong sense of jumping. Its controlled flashing sequence adopts a vault chasing method of 1-3-2-4. The route is as shown in the figure.
    The diodes VD1-VD4 form a bridge rectifier circuit, and the full-wave rectified voltage is output as the power supply of the 4-way lanterns. At the same time, it passes through the current-limiting resistor
Ri and is filtered by the capacitor Ci as the power supply of the integrated circuit SH9043. Potentiometer RP and capacitor c2 are the external resistors and capacitors of SH9043.
Adjusting RP can adjust the oscillation frequency of the chip's internal oscillator, thereby changing the 4-way lantern vault chasing speed. The flash frequency can
vary between 1 and 200Hz. The ①, ②, ⑦ and ◎ pins of the integrated circuit
are connected to the control poles of the thyristors VTH2, VTH4, VTH1 and VTH3 respectively. The 4 output signals are used to control whether the thyristor is conductive or not. As a result, the light string EL1
-ELA connected in series in the thyristor anode circuit shines.