Voice-activated LED Melody Light
Features: After the kit is successfully produced, as the music or other sounds sound, the five LED lights follow the rhythm of the sound (the speed of the sound) and move. It can be placed near the sound, you can feel the beautiful melody combination of sound and light, let the light dance with music!
Circuit Principle:
The voice-activated LED melody lamp circuit is composed of a power supply circuit, a microphone amplifying circuit and an LED lighting indicating circuit. The power source is input by J1, and the C1 filter is used for the circuit. The MIC1 converts the sound signal into an electrical signal, which is coupled to Q1 by C2, and the amplified signal is sent to the base of Q2. The LED is illuminated by Q2. The louder the sound, the higher the brightness of the LED.
Common Problem:
1. LED positive and negative poles are not noticed, long legs are positive. 2. The three resistors are not soldered according to the marking on the board. Use a multimeter to measure or look at the resistance color ring reading. 3. The triode is not inserted in accordance with the shape on the board, resulting in the wrong direction. 4. The positive and negative poles of the microphone are not right, the positive pole of the long leg, or the pin connected to the outer casing is the negative pole. 5. Electrolytic capacitance value welding error, a 1uf, a 47uf, pay attention to distinguish, long foot positive. 6. The positive and negative poles of the power supply are connected in reverse. The mark on the board is the positive one. The line corresponding to the + mark is the positive pole, and the line corresponding to the – sign is the negative pole. 7. Check the welding short circuit and the phenomenon of virtual soldering. The power supply voltage is 3-5.5V. A stable power supply is required. It is best to use battery power. Appendix: Specific identification methods for four-ring and five-ring color ring resistors
Voice-activated LED Melody Light
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