1 DIY Voice-Controlled LED Melody Light Module - USB-Powered, 3V-5.5V Operating Voltage, No Batteries Required, PCB Mount, Solder Terminals, Ideal for Electronics Hobbyists and Beginners, Electronics Craft Kit | Melody Light Module | Solderable Components, Voice-Controlled Light
Power Supply: USB
Operating Voltage: 36V
Battery Properties: Battery Not Included
Contact Material: Copper
Terminal Type: Solder
Mounting Type: PCB Mount
The positive and negative polarity of the LED is often overlooked; the longer lead represents the positive terminal.
The three resistors are connected differently than indicated on the circuit board. Use a multimeter to check or refer to the resistor color codes.
The transistor is incorrectly positioned on the circuit board, resulting in incorrect orientation.
4. The microphone's positive and negative polarity are incorrectly connected; the longer lead should be positive, while the lead connected to the housing is negative.
5. The electrolytic capacitors are soldered with the wrong value; one is 1µF, the other is 47µF. Be careful to distinguish them, as the longer lead is the positive terminal.
The power supply's positive and negative polarity are incorrectly connected. The circuit board indicates which is the positive terminal. The wire connected to the + symbol is the positive terminal, and the wire connected to the - symbol is the negative terminal.
7. Check for shorts and poor soldering. The power supply voltage should be between 3 and 5.5V. A reliable power supply is required, preferably batteries. Appendix: Detailed identification tips for four- and five-color-ring resistors.
Understanding Dimensions
Voice-Activated LED Melody Light Function: Once assembled, the five LEDs will flash in sync with the rhythm of music or other sounds. Hold it close to a sound source to experience the beautiful fusion of light and melodylet the lights dance to the music!
The voice-activated LED melody light circuit includes a power supply, a microphone amplifier, and an LED indicator. Power is supplied through J1, and C1 acts as a filter. MIC1 converts the sound signal into an electrical signal, which is then coupled to Q1 via C2. The amplified output is directly fed to the base of Q2. Q2 controls the LED light, whose brightness increases with increasing sound.
