Two-color dance synchronous strobe light circuit
As shown in the figure, the device enables the ballroom lantern to be rhythmically flashed as the dancer's movement changes, emitting red. Green two different colors of light. This circuit adopts the human body pyroelectric infrared control method, which will add color to the family dance and song and dance evenings.
Circuit principle: The thermal pyroelectric infrared sensor BH can remotely detect the infrared rays emitted by the dancers in the range of 10m in front of it, and convert it into an ultra-low frequency AC signal that changes with the frequency of human activity. After being amplified by the transistors V1-V2, it is used as a two-way. The trigger signal of the thyristor SCR. Since the H1 power of the lantern group is much larger than the H2 power, most of the voltages in the 220V drop to the H2 terminal, so that H2 emits near-normal green light, and H1 emits only weak red light. When someone dances, V1 outputs a positive pulse signal, triggering SCR to turn on, H2 is short-circuited and does not emit light at both ends, and H1 emits normal red light. As the dancers dance gracefully, the lantern groups H1 and H2 will alternately flash. Move, emit red, green and different colors of light.
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