555 dream lantern control circuit diagram

Fantasy lanterns with wonderful changes, can be used in shops, dance venues or home holiday decorations. Its control circuit is shown in the figure.

The lantern control circuit consists of a multivibrator, a control circuit, a thyristor trigger circuit and a step-down power supply circuit. The AC step-down rectifier circuitprovides +9V DC voltage to IC 1 and IC2. IC2 uses YX9010, a dedicated integrated circuit for lantern control, which has eight lantern control modes in its chip memory. The peripheral circuit of this integrated block is very simple. It can be controlled manually or automatically. AN is a manual switch. Each time it is pressed, the color light display scheme changes once, which can realize all four color lights, fast and slow forward flash cycle, fast and slow backward cycle flash, and forward and backward switching flash, etc.

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SA is the automatic mode switch. Connect it to the output pin 3 of IC1 (closed) to realize automatic conversion and control of the colored lights. IC1 (555) and R1, RP1, R2, C1, etc. form a multivibrator. Its oscillation period T=0.693 (R1+2R2+RP1) C1

The oscillation period given by the parameters in the figure is 5 to 76 seconds, and the duty cycle is close to 1:1. The multivibrator pulse output by IC1 is added to pin 13 of the control mode conversion terminal of IC2. Each time it comes to a high level, it is specially used for lanterns. The outputs A, B, C, and D of IC 2 change state once. As the astable circuit continues to flip, the flash patterns and colors of the lanterns also continue to flip, changing over and over again, creating a dreamy effect. The thyristor in the circuit can be selected according to the power of the load lantern. 3CTS-1A, 3CTS-3A, SCTS-5A, etc. can be used, and its reverse breakdown voltage should not be lower than 400V (Class D). Triac.