SH-802 Holiday Lights ASIC

The holiday lantern controller circuit made with SH-802 integrated circuit
is shown in Figure 2-56. After the power supply is rectified by VDI~VD4, stepped down by Rl and current limited by VD5 and
stabilized by VD5, it outputs a DC voltage of about 5.IV, which is added to the VDD end of the integrated block to provide
power for the integrated block. R2 obtains the synchronization signal for the integrated block . R3 is the
external oscillation resistor of SH-802 . R4~R7 are the output resistors of SH-802. After power on, the four-way colored lights H1~H4 will
automatically change in cycles according to the program pattern stored in the chip. Press button SB to manually set the changing pattern. Each time SB is pressed, the pattern
will change.