WONDOM DKT2X20AB 2 Channel 20W Audio Amplifier DIY Kit User Manual

Product Overview

The WONDOM DKT2X20AB is a 2x20W DIY kit featuring the TDA7576B integrated chipset from STMicroelectronics. It is designed for 12V-24V systems and offers a dual bridge power amplifier with MOSFET power stages, leveraging Multipower BCD technology for enhanced performance and efficiency.

Features

• Class AB output utilizing the TDA7576B integrated chipset.
• Supports up to 2x20W of power with a 24V supply into a 4Ω load.
• Flexible audio input connector allows connectivity with an ADP panel.

Applications

• Education Purpose.
• DIY Project.
• Solder Practice.

Schematic

The schematic provides a visual representation of the circuit, detailing components and their electrical pathways. It is crucial for understanding the amplifier board's design, functionality, assembly, customization, and troubleshooting.

Parameters

Mechanical Drawing

The product dimensions are approximately 82.55mm (3.25") in length, 63.50mm (2.50") in width, and 31.75mm (1.25") in height. The PCB thickness is typically 1.6mm or 2mm, depending on the production batch. Key connector and mounting hole dimensions are also indicated.

Installation Summary

1. Install SMD Resistor(s): Place SMD resistors on the top and bottom side of the board according to their respective positions.
2. Install Ceramic Capacitor(s) & Fuse: Install the ceramic capacitor and fuse into their designed positions, ensuring leads are properly inserted and soldered securely.
3. Install Electron Capacitor(s) & Through-Hole Inductor(s): Install electrolytic capacitors and through-hole inductors in their designated areas. Pay close attention to the polarity of electrolytic capacitors (+ and - leads) before soldering.
4. Secure the Heatsink and TDA7576B IC: Attach the IC and Heatsink using an M3 screw through the screw hole and secure them tightly.
5. Install IC and the Heatsink: Place the IC and heatsink assembly in the designated position on the board.
6. Install Remaining Component(s): Proceed to install the remaining components onto the PCB board, ensuring correct alignment and secure soldering for each component.

Board Layout

The board layout section illustrates the placement of various components on the PCB. Key components are numbered for identification:

• 1 Electrolyte Capacitor (220uF): Stores electrical energy.
• 2 JST-PH-2mm 5 Circuits Connector: For external audio input.
• 3 Ceramic Capacitor (1uF): Stores electrical energy.
• 4 Ceramic Capacitor (330pF): Stores electrical energy.
• 5 TDA7576B: Integrated circuit for Class AB amplifier audio design.
• 6 Film Capacitor (1uF): For stability performance and low-loss.
• 7 3.5mm Audio Connector: For audio input.
• 8 Varistor (24V): Protects against sudden voltage increases.
• 9 Zener Diode (4.7V): Allows current flow in one direction.
• 10 Transistor: Used for switching applications.
• 11 JST-PH-2mm 2 Circuits Connector: For mute and standby control.
• 12 Diode (40V): Allows current flow in one direction.
• 13 Green LED 3mm: Output indicator for OUT1 and OUT2.
• 14 JST-VH-4mm 2 Circuits Connector: For audio output at OUTR and OUTL.
• 15 Molex Micro-Fit 2 Circuits Connector: For power supply.
• 16 Ceramic Capacitor (0.1uF): Stores electrical energy.
• 17 Electrostatic and Surge Protection (28V): Safeguards electronics from damage.
• 18 Fuse: Breaks the circuit during power surges or short circuits.
• 19 Varistor (28V): Protects against sudden voltage increases.
• 20 Ceramic Capacitor (1nF): Stores electrical energy.
• 21 Inductor (22uH): Stores energy in a magnetic field.
• 22 Heatsink: Dissipates heat from components to prevent overheating.
• 23 Resistor: Regulates electric current flow.

Electrical Parameters

Warranty Terms and Product Usage Restrictions

WONDOM products include a one-year warranty from the date of purchase. Customers are responsible for return shipping costs. Visible damage, solder pad tinning, or use of incorrect power sources invalidates the warranty. Products are intended for DIY use only and do not support industrial applications. The rated operating temperature is 0-40°C. For industrial applications or wider temperature ranges, consult products specifically labeled for those conditions. Customers agree to these terms by purchasing.

Bulk Purchase Rights

Bulk purchase rights are limited to the quantity purchased in a single transaction and are not related to cumulative purchase volume. Pricing may vary with customization. Retail purchases are available via Taobao and AliExpress. For bulk orders of 500 units or more, contact WONDOM via email for purchasing orders or customization options (e.g., PCB color, silk screen, brand logo). WONDOM does not offer changes to PCB dimensions or ports. A standard price list for bulk purchases can be requested.

About The Manual

This manual provides general installation guidelines. Proper component installation requires qualified experience. If lacking the necessary knowledge or tools, consult an authorized WONDOM dealer. Keep all instructions and sales receipts for reference.

Components Checklist