SH-809 Holiday Lights ASIC

The holiday lantern controller circuit made with SH-809 integrated circuit is shown in Figure 2-68. It consists of three parts: power supply circuit, light control
integrated circuit and thyristor
control circuit.     The 220V alternating current is rectified by VDI~VD4 bridge and outputs a full-wave pulsating current for powering 4-way lanterns. At the same time, the full-wave
pulsating current is reduced by Rl and current limited, VD5 stabilized and cl filtered to output 4+5~5V stable DC. Voltage, for manifold A to use
electricity. The four output terminals Ll-IA of the integrated block output trigger pulses directly to the gates of the thyristors
VS1~VS4, and control their conduction angles to make the colored lights H-H4 flash in the required pattern. Its pins 8 and 9 output audio signals that can directly drive the piezoelectric ceramic
piece B to emit piano music sounds. Press the key switch SB to select the light jump mode and the sound volume of the piezoelectric ceramic chip.