As shown in the figure is a self-control color-changing voice advertising light box circuit. It can start automatically and stop automatically.
Circuit principle: The light box circuit includes a power circuit, a light control circuit, a timing circuit, a voice circuit and a light change circuit.
The voice circuit is composed of IC3, V4, V5 and speaker B, and continuously outputs the "welcome to" voice signal to attract passengers. At the same time, the light conversion circuit composed of IC4, solid state relay SSR and electric lamps H1, H2 starts working. IC4 is a 555 time base integrated circuit. It forms an oscillator with the peripheral components R10, R11, and C10. The 3-pin output pulse oscillation signal has a period of about 10s. When the 3-pin output is high, the trigger SSR2 is turned on, and the green light is on; when the 3-pin output is low, V4 is turned on, triggering SSR1 to be turned on, and the red light is turned on. bright.
When the timing circuit IC2 works until the 3 pin jumps to the high level, the timing ends, V3 is turned off, and the rear stage circuit loses power and stops working. At the same time, the high level of the IC2 3 pin output is added to the 11 pin of IC2, making it a constant high. Level, the oscillation stops, until the next evening, IC2 is powered on again and then starts working again.
Adjusting the potentiometer RP1 can change the light control sensitivity. R1 and C4 form an anti-interference delay circuit to prevent nighttime lighting and lightning and other interferences from affecting the normal operation of the circuit. The working time of the color-changing voice advertising light box is calculated by t=2.3NR4C7, where N is the timing coefficient, which is determined by the circuit connection mode. According to the mode, N=8192, the timing time is about 5h, and the voice circuit IC3 can also be needed according to the needs. Select another voice circuit. If a pulse-triggered voice circuit is used, only a 2kΩ resistor is needed to connect the trigger terminal to IC4 pin 3.
Circuit principle: The light box circuit includes a power circuit, a light control circuit, a timing circuit, a voice circuit and a light change circuit.
The voice circuit is composed of IC3, V4, V5 and speaker B, and continuously outputs the "welcome to" voice signal to attract passengers. At the same time, the light conversion circuit composed of IC4, solid state relay SSR and electric lamps H1, H2 starts working. IC4 is a 555 time base integrated circuit. It forms an oscillator with the peripheral components R10, R11, and C10. The 3-pin output pulse oscillation signal has a period of about 10s. When the 3-pin output is high, the trigger SSR2 is turned on, and the green light is on; when the 3-pin output is low, V4 is turned on, triggering SSR1 to be turned on, and the red light is turned on. bright.
When the timing circuit IC2 works until the 3 pin jumps to the high level, the timing ends, V3 is turned off, and the rear stage circuit loses power and stops working. At the same time, the high level of the IC2 3 pin output is added to the 11 pin of IC2, making it a constant high. Level, the oscillation stops, until the next evening, IC2 is powered on again and then starts working again.
Adjusting the potentiometer RP1 can change the light control sensitivity. R1 and C4 form an anti-interference delay circuit to prevent nighttime lighting and lightning and other interferences from affecting the normal operation of the circuit. The working time of the color-changing voice advertising light box is calculated by t=2.3NR4C7, where N is the timing coefficient, which is determined by the circuit connection mode. According to the mode, N=8192, the timing time is about 5h, and the voice circuit IC3 can also be needed according to the needs. Select another voice circuit. If a pulse-triggered voice circuit is used, only a 2kΩ resistor is needed to connect the trigger terminal to IC4 pin 3.
Twinkle System Technology Co Ltd , https://www.pickingbylight.com