GeekLJT 33KO Dual Channel Bluetooth Audio Soldering Kit Instruction Manual

33KO Dual Channel Bluetooth Audio Soldering Kit
Instruction Manual

Introduction

Dual Channel Bluetooth Audio Soldering Kit

• Support 5.0 Bluetooth
• Beautiful appearance
• Excellent sound quality
• Supports audio cable

Product parameters

Function Demo

• Power Supply
  – Fast charging head of the cell phone is more recommended.

• Bluetooth mode
  – Bluetooth turns on automatically after power on. Short press
  K1 to turn Bluetooth on or off. Short press K2 for the previous song, long press for volume reduction; Short press K3 for the next song, long press for volume increase.

• Audio Cable Mode
  – After inserting the audio cable, the Bluetooth input function is disconnected. The audio cable input is not affected by Bluetooth.

• Adjust the overall volume
  – Toggle the gear potentiometer to the left to increase volume, toggle to the right to decrease volume

Application

Component Listing

Schematic Diagram

Installation Tips

• Before installation, users need to prepare the welding tools in advance.
• The installation process requires enough care and patience.
• Be sure to read through the installation instructions before starting the installation.
• Welding sequence: components from high to low
• In order not to damage the components, the soldering iron should not touch the components for too long.
• Pay attention to the positive and negative markings on the pcb, long pin of the component is positive.
• Ensure that similar components with different parameters are placed in the correct position on the pcb.
• Wearing anti-static gloves or anti-static wristbands is better.
• Ensure that components are not accessible to children.

Step1: Install the 8002A chip

Tips:
1. Make sure the direction of the 8002A chip’s concave dot marking is the same as the direction of the PCB silkscreen white dot marking before soldering.
PCB Marker: U1,U2

Step2: Install the resistors

Tips:
1. Solder 10KΩ (brown-black-black-red-brown), 30KΩ (orange-black-black-red- brown), and 33KΩ (orange-orange-black-red-brown) resistors against the silkscreen location.
PCB Marker:
10KΩ – R1,R3,R5
30KΩ – R2,R4
33KΩ – R6

Step3: Install the Bluetooth Audio Module

Tips:
1. According to the screen printing position, weld the Bluetooth audio module (MH-M18).
PCB Marker:
P4

Step4: Install the Android power interface & dial adjustable potentiometer

Tips:
1.Weld the Android power interface and dial adjustable potentiometer.
PCB Marker:
Power interface – USB1
Dial adjustable potentiometer – RK1

Step5: Install the Red audio socket & Power switchPCB Marker:
Audio socket – P1
Power switch – SW1

Step6: Install the electrolytic capacitor

Tips:
1. The long pin of the electrolytic capacitor is positive and the short pin is negative; The shaded portion of the PCB silkscreen corresponds to the negative terminal.
PCB Marker:
1uF – C1,C2,C6,C7
10uF – C3,C8
470uF – C4,C5

Step7: Install the Black Key

PCB Marker: K1,K2,K3

Step8: Soldering the speaker connecting wires

Tips:
1.2P red and black parallel wires (red positive, black negative) corresponding to the speaker positive and negative (positive “+” negative “-“) welding.

Step 9: Soldering the two speakers to the PCB

Tips:
1. Soldering the two speakers to the PCB; Left speaker (red wire: L+, black wire: L-) and the right speaker (red wire: R+, black wire: R-).

Step10: Power on test

Tips:
1. Connect the 5V DC power supply, power on and connect the Bluetooth (name: MH-M18) and audio cable respectively, test the functions, confirm the normal function before installing the shell.

Step11: Tear off the protective film of the shells Tips:
1. After confirming that all functions are normal, start to install the shell and tear off the protective film from the corners of the acrylic. Note: It is forbidden to rub with knives, iron sheets or other hard objects! It is easy to damage the acrylic shell

Step12: Install the copper column

Tips:
1. Thread the single-pass copper column up from the bottom of the PCB and screw a nut on it to secure it.

Step13: Install the speaker on the front shell

Tips:
1. Adjust the installation direction of the front shell and insert medium- length screws from the front. When the speaker is installed, the cable should be installed towards the bottom; Then screw the nut, adjust the position of the speaker, and then tighten the screw.

Step14: Install the nylon column on the speakers

Tips:
1. After the speaker is fixed, screw the double-pass nylon column on the two screws on the left and right sides near the edge, and keep it 90 degrees perpendicular to the front shell.

Step15: Install the bottom shell

Tips:
1. First, organize the speaker connecting wires to the bottom of the PCB, adjust the orientation of the bottom shell, screw holes aligned with the copper column, and then screw in the shortest M3 screws to fix it.

Step16: Install the nylon column on the bottom shell

Tips:
1. Thread the medium-length M3 screws through the bottom shell, then flip it over and screw on the double-through nylon column for fastening.

Step17: Install the shells

Tips:
1. Adjust the alignment of the openings, install the top and bottom and left and right housings, then install the rear shell.

Step18: Install the shells

Tips:
1. Screw in the longest screws through the rear shell screw holes, then flip it over and screw in the longest screws through the top shell screw holes to secure it.

Step19: Install the shells

Tips:
1. Pick up the M2 nut with tweezers, carefully put it in the card slot of the left and right shells, and then screw in the M2 screw to fix it.

Step20: Install the keycaps

Tips:
1. Press the keycap to align the key and press down vertically to install.

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