SR63 holiday lights ASIC

After the 220V AC power is bridge-rectified by VDI~VD4, it is output from point a. One channel directly supplies power to the lanterns H1~H4;
the other channel is stepped down by Rl and stabilized by VD5 to output about 5v DC voltage for the integrated block A. . R2 and R3 form a voltage divider to provide synchronization signals
for integrated block A.
    RP1, R4, C3 and SR63 and the internal circuit form a system oscillator. Adjusting the value of RPI can change the system oscillation frequency
and adjust the chasing speed of the four groups of colored lights. RP2 and the internal circuit form a dimming oscillation circuit. Adjusting the value of RP2
can change the dimming speed and the contrast between bright and dark lights . In the figure, the four control terminals DIM, Sl, so, and TIP are not connected. During
actual production, they should be connected according to the needs of the pattern according to Table 2-41 or use switches for switching operations.