aerobotics

Digital circuit production 06-eight tone loop player

Overview

1. Introduction to circuit simulation and principles

R17, R20, C5 and NE555 together form a multivibrator to provide pulse signals for the CD017 shift register. Q0~Q7 provide a pulse signal to the following 555 chip through a potentiometer. Because of the shifting characteristics of CD4017, the external potentiometers of Q0~Q7 and R22, C7 and NE555 form a second multivibrator circuit one by one to drive The speaker emits sound and adjusts eight potentiometers to achieve an effect of eight different sounds being played in a loop. Q8 is connected to an external LED light. When the LED lights up after one cycle, Q9 is connected to the INH of pin 13. When the switch is closed, it can be played over and over again. After the switch is turned off, it can only be played once.

2. Precautions

(1) Adjust the size of the R6 potentiometer to make LED1 flash slower, not too fast, so that the sound is rhythmic;

(2) Adjust the potentiometers corresponding to Q0~Q7 to output different tones. This step needs to be adjusted slowly to make the output sound clear;

(3) Pay attention to the polarity of the diode during the welding process. The direction of the line on 4148 represents the negative electrode. Check the direction when installing the chip.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-23 10:45:00

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