SH-816 Holiday Lights ASIC

The chip has built-in 4 types + 8 types of pattern jumping programs, which are controlled by double keys . The button SB2 connected to pin 6 is the function selection
button, and the button SB1 connected to pin 5 is the lock button for the 8 light jump modes.
    Press SB2 to achieve the following controls : 1. Large volume + three jumping methods (the four jumping methods are: four lights
flashing , two lights in a group flashing alternately with the music beat, single light flashing with the music beat , the four lights light up one by one according to the beat of the music,
and then turn off in turn. The conversion method is to automatically change one jumping method after each piece of music is played); 2. Medium volume + 4 jumping methods; 3.
Low volume + 4 jumping methods method; 4. 8 kinds of light jumping modes cycle; 5. The light string is all bright.
    SBI is a lock key with 8 light jump modes. It only works when SB2 is in the 4th mode. Pressing SBI will work. The specific
ways of light jumping are: 1. A single light flashes in sequence: 2. The downstream water and the reverse water alternately change; 3. The stars flash and the horse racing style changes
automatically ; 4. The four lights light up one by one in sequence, and then go out one by one: 5 . A single light gradually changes in brightness and darkness automatically (like a rolling wave):
6. Two adjacent lamps, one gradually dims and the other gradually brightens, and "moves" forward in sequence {7. Four lights gradually dim and brighten at the same time: 8. The stars
are twinkling.
    The working voltage of SH-816 is supplied by CI step-down, VD1, VD2 rectifier, VD4 voltage regulator and c5 filter. In order to obtain
a larger volume, the working power supply of audio amplifiers VT1 and VT2 is taken from the left end of resistor R6. In order to improve the sound quality, the amplifier circuit
uses VT1 and VI2 complementary outputs. R5 is its negative feedback resistor, R7 and R8 are current-limiting anodes, which are used to adjust
the static operating point of the complementary circuit.