CLAINS DIY 2.1Amplifier board

Key Features

1. High-Power Output Stage

· Core Components: Built around the 2SD718 (NPN) and 2SB688 (PNP) transistor pair.
· Robust Performance: This combination is known for handling high power (typically 80W-100W per transistor) and high current, making the amplifier capable of delivering clean, dynamic audio without distortion, especially at high volumes.

2. 2.1 Channel Configuration

· Dedicated Subwoofer Channel: The standout feature is the separate mono amplifier for a subwoofer (the ".1"), designed specifically to produce deep, powerful bass.
· Stereo Satellite Channels: Two separate channels for left and right speakers, providing clear and distinct stereo imaging for mid and high frequencies.

3. Integrated Low-Pass Filter (LPF) for Subwoofer

· Clean Bass: The subwoofer channel includes a dedicated filter that blocks mid and high-range sounds. This ensures only low bass frequencies are sent to the subwoofer, resulting in tighter, punchier, and distortion-free bass.

4. Built-in Preamp and Tone Controls

· Signal Flexibility: Includes an operational amplifier (op-amp) based preamplifier stage that can directly accept low-level signals from sources like smartphones, PCs, or TVs.
· Sound Shaping: Typically features adjustable controls for:
 · Master Volume
 · Bass Level
 · Treble Level
 · Subwoofer (or Bass) Gain for independent control of the subwoofer's intensity.

5. Efficient Class AB Amplification

· Best of Both Worlds: Uses a Class AB design for the output stage, which provides a good balance between the high fidelity of Class A and the high efficiency of Class B amplifiers. This means great sound quality without excessive heat generation under normal listening conditions.

6. Robust Thermal Management

· Large Heatsinks: The board is designed with substantial aluminum heatsinks, which are crucial for dissipating the heat generated by the D718/B688 power transistors during operation, ensuring stability and long component life.

7. DIY-Friendly Design

· Clear Terminals: Often uses screw-terminal blocks for easy connection of speakers, power supply, and audio inputs without soldering.
· Standardized Layout: The components are typically arranged logically, making it straightforward to integrate into a custom audio project.

8. Wide Operating Voltage Range

· Flexible Power Options: Can often operate with a wide range of dual power supply voltages (e.g., ±12V to ±25V DC). This allows users to tailor the output power to their needs and available power transformer.

Summary of Key Benefits:

· Powerful & Clear Sound: The D718/B688 pair delivers strong, clean power, especially for bass.
· All-in-One Solution: Integrates preamp, tone controls, and filtering on a single board.
· Great for Bass Lovers: The dedicated, filtered subwoofer channel is ideal for music and home theater.
· Versatile and Cost-Effective: A popular and affordable choice for building or upgrading audio systems.