Figure 2-78 is SH-841 as the core device made holiday lights controller. By SCR VSl ~ VS4 to drive light string H1 ~ H4 flashes. Manifold operating voltage by AC by VD1-VD4 bri
dge rectifier, Rl buck, VD5 filter regulator and C2 obtained. Manifold 2 feet of the music signal output by the amplifying transistor VT to drive the piezoelectric ceramic sheet B made sound. Adjustment potentiometer RP can control the sound volume.