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Circuit diagram principle: Take part of the audio signal from the two ends of the speaker, after adjusting the potentiometer Rp, add it to the two ends of the two-way LED VD to make it flash with the music rhythm. VD and the photoresistor RL form a photocoupler, so The resistance of RL will follow the change of VD. When the music sound is weak or intermittent, VD does not emit light, RL is high impedance, and the triac VS is blocked without voltage. Since the power of the lantern group H1 is much larger than H2, most of the 220V mains voltage drops to Both ends of H2 make H2 emit green light when it is close to normal. H1 only emits a faint red light. When the music sounds louder, the VD emits strong light, R1 is low-resistance, V3 obtains the AC electric trigger signal and the opening angle is also large, so the H2 ends are short-circuited and do not emit light, H1 emits normal red light, with the rhythm of the beautiful music. Ups and downs, H1 and H2 will alternately emit light and red and green.
Component selection and debugging: VS selects BCR3AM-8, TLC226 and so on. VD uses 2EF303 type two-way color-changing light-emitting diodes. It can also be replaced by ordinary square (2.5mm×5mm) light-emitting diodes in reverse parallel connection. RL uses MG45 type unsealed type photoresistor; Rp uses WS2-1 type organic solid core. Potentiometer, H1, H2 lamp group is composed of 220V, 15 ~ 25W color bulbs. 
Two-color music lantern circuit principle
The music lantern circuit shown in Figure 7-16 enables the lantern group to flash with the rhythm of the music, emitting red and green colors, which can be used in bars, small ballrooms and karaoke halls.