Bluetooth speaker assembly electronic DIY kit

The Bluetooth-assembled speaker electronic DIY kit consists of two parts. The Bluetooth power amplifier module is a finished product using an 8002A power amplifier circuit with a simple structure and stable performance. With a pair of 4-ohm 3-watt speakers, the sound quality is clear. Spectrum lights use CD4017 chips to control 10 LED lights, which can flash according to the volume and rhythm of music to form spectrum effects.

Small speaker details:

1) Remote control control to realize on/off and mute volume control.
2) Bright cone full-range small speaker, PU edge, silver and black cone diaphragm, 40 magnets, 4 ohms, and 3W. The full-range sound quality is good, and the low-frequency performance is also very good. It is very cost-effective and has high sensitivity and clear sound quality.
3) The shell comprises 6 pieces of 3mm high-transparency acrylic. Exquisite and beautiful, the brown protective film must be removed before splicing.

4) 3.7-5V DC power supply automatically plays music, 3W+3W stereo amplifier, supports Bluetooth, supports power-off memory, and plays music from a U disk.
5) The audio lantern module can flash the lanterns along with the music, adding a lively splendor to the entire speaker. When shipped, they are all in pieces and need to be welded according to the drawings.

Wiring instructions: The white terminal is connected to the speaker, and the red terminal is connected to the power supply.
Reminder: Please use it strictly according to the product instructions. Improper use and wiring will cause the power amplifier to fail to work normally or damage the power amplifier.

Schematic diagram of the lantern kit:

Circuit function:
A 5V power supply powers the red terminal of the Bluetooth module, the white terminal is the left and right channel of the speaker, the red line is positive +, and the black is negative -. As the music or other sounds sound, the LED light will flash and move with the rhythm of the sound (the speed of the sound). After successful welding, you can feel the melodic combination of sound and light.

Circuit principle:
The voice-activated LED melody light circuit consists of a power supply circuit, a microphone amplifier circuit, and an LED light-emitting indicator circuit. The power supply uses two batteries. The MIC converts the sound signal into an electrical signal, which is coupled to Q1 for amplification via C2. The amplified signal is sent to U1, and U1 drives the LED to emit light. The louder the sound, the higher the brightness of the LED and the faster the flow rate.