The VELLEMAN K4001 7W Mono Audio Amplifier Kit is a compact, high-quality audio amplifier designed for hobbyists, students, and DIY audio enthusiasts who require reliable sound amplification in a small, easy-to-build package. Built around the proven TDA2003 audio amplifier IC, this kit delivers clean, low-distortion audio while incorporating comprehensive protection features for dependable long-term operation.
Designed for a wide variety of mono audio applications, the amplifier produces up to 7W music power into a 4 speaker, with continuous output ratings of 3.5W RMS at 4 or 2W RMS at 8 . Its wide 20Hz to 20kHz frequency response ensures accurate reproduction of both low and high frequencies, making it suitable for music playback, speech amplification, intercom systems, and general-purpose audio projects.
The TDA2003 integrated circuit features built-in overload, thermal shutdown, and short-circuit protection, helping protect both the amplifier and connected speakers from accidental damage. Combined with a very low 0.05% total harmonic distortion (THD) at 1W output, the amplifier delivers clear, natural sound with minimal unwanted noise or distortion.
Operating from a 15V DC power supply (with an allowable range of 8V to 18V DC), the amplifier requires approximately 0.5A during operation. Its high 86dB signal-to-noise ratio provides clean audio performance, while the 40mV input sensitivity allows compatibility with a wide range of audio sources including pre-amplifiers, MP3 players, radios, audio modules, and other line-level devices.
The compact 55 × 35mm PCB makes installation easy in custom audio equipment, portable speakers, educational projects, and electronic prototypes. Supplied as a self-assembly kit, the VELLEMAN K4001 is also an excellent introduction to audio amplifier construction and analogue electronics.
Whether you're building a custom speaker system, repairing audio equipment, or experimenting with amplifier circuits, the K4001 offers dependable performance and excellent sound quality in a compact format.
Features
Compact mono audio amplifier kit
Based on the reliable TDA2003 audio amplifier IC
Up to 7W music power output
Wide audio frequency response
Low total harmonic distortion
High signal-to-noise ratio for clear sound
Built-in overload, thermal, and short-circuit protection
Suitable for 4 and 8 speakers
Operates from a standard DC power supply
Ideal for DIY audio, educational, and repair projects
Easy to assemble and install
Specifications
Product Code: VELLEMAN K4001
Product Name: 7W Mono Audio Amplifier Kit
Function Group: Audio / Amplifiers
Amplifier IC: TDA2003
Music Power Output: 7W into 4
RMS Output Power: 3.5W into 4 ; 2W into 8
Frequency Response: 20Hz-20kHz (-3dB)
Total Harmonic Distortion (THD): 0.05% (1W at 1kHz)
Signal-to-Noise Ratio: 86dB (A-weighted)
Input Sensitivity: 40mV
Input Impedance: 150k
Power Supply: 15V DC nominal (8-18V DC operating range)
Current Consumption: 0.5A
Protection: Overload, overheating, and short-circuit protection
PCB Dimensions: 55 × 35mm (2.2 × 1.4")
Typical Applications: DIY audio amplifiers, portable speaker systems, intercoms, educational electronics, radio projects, multimedia audio, custom sound systems, hobby electronics, and general-purpose mono audio amplification.
What's in the box
1 x VELLEMAN K4001 7W Mono Audio Amplifier Kit with TDA2003 IC 15VDC
