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Use NE555 to make a lighting and sound changing circuit
Source: InternetPublisher:他们逼我做卧底 Keywords: NE555 light changing sound Updated: 2023/11/20
The circuit composition is as shown in the figure: The circuit consists of BT (4.5V), switch (S), and U (555) bipolar time base integrated circuit. Capacitors C1 (10μ F), C2 (0.01 μ F), resistors R1 (1k), R2 (5k). It is composed of photodiode VD and speaker SP.
Circuit working principle: The internal resistance of the photodiode will change with the intensity of light. When light shines on the photodiode VD, its resistance becomes smaller, causing the audio oscillation to become lower and the speaker SP to change the tone. This circuit can also use a photoresistor to replace the photodiode, and also change the 5k resistor to a 56k resistor, and the tone change is more obvious.
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