CS9482 Holiday Lights ASIC

The holiday lantern circuit made with CS9482 integrated circuit is shown in Figure 2-37. Since the CS9482 chip has a 4.1V voltage stabilizing circuit inside
, the external circuit does not need to stabilize the voltage. However, if the voltage exceeds 4V, a current-limiting resistor R2 should be added to the external circuit. VT
is used to amplify the music signal output by pin 5 of the integrated block to drive the piezoelectric ceramic piece B to produce sound. The voltage regulator tube VD5 and the potentiometer RP in the figure are mainly used to adjust the working voltage
of the transistor VT , and VD5 can also be omitted. After the circuit is powered on, the colorful light strings HI and H2 can flash and glow, and at the same time, the piezoelectric ceramic piece B can also play the electronic music stored in the chip.