L12-2 120W+120W Stereo Power Amplifier DIY Kit – Dual Channel

L12-2 120W+120W Stereo Power Amplifier DIY Kit – Dual Channel

Build your own high-performance stereo audio amplifier with the L12-2 dual-channel power amplifier DIY kit. Designed for audio enthusiasts, electronics hobbyists, and experienced DIY amplifier builders, this kit features the L12-2 discrete-component amplifier circuit and supports a published output rating of 120W per channel into 8Ω with a ±50V DC power supply.

This version includes two unassembled amplifier board kits fitted with Sanken-series output transistors, intended for building a complete two-channel stereo amplifier.

The L12-2 circuit is designed for low distortion, wide frequency response, and high-fidelity audio reproduction when correctly assembled, powered, and configured.

Key Features

• Dual-channel stereo configuration: Includes two amplifier board kits, one for each audio channel.

• 120W per channel: Published output rating of 120W into 8Ω at ±50V DC.

• Discrete-component amplifier design: Suitable for DIY high-fidelity audio projects.

• Sanken output transistor version: Components for the Sanken-based amplifier configuration.

• Low harmonic distortion: Manufacturer-published THD below 0.0005% at 1kHz and 10W.

• Wide frequency response: Published frequency range of 15Hz–50kHz (-3dB).

• DIY assembly: Intended for users experienced with electronic component soldering and amplifier construction.

• External power supply required: Designed for a suitable regulated or adequately filtered bipolar DC power supply.

Technical Specifications

Specifications are based on the manufacturer's published information. Actual performance depends on assembly quality, power supply, heatsinking, speaker load, and operating conditions.

Assembly and Installation

This product is supplied as an unassembled DIY amplifier kit and requires technical assembly before operation.

1. Install and solder the supplied components onto the amplifier PCBs according to the circuit layout.

2. Mount the output transistors to a suitable external heatsink using the required insulation and thermal interface materials.

3. Connect a compatible bipolar DC power supply to the designated VCC+, GND, and VEE- terminals.

4. Connect the audio signal input and speaker output to the correctly identified terminals.

5. Check wiring, polarity, insulation, and component installation before applying power.

6. Verify the amplifier's operating conditions and bias according to the appropriate assembly guidance before connecting speakers.

Important: A suitable heatsink, power supply, enclosure, and other necessary system components are required for a complete amplifier build. Do not operate the amplifier without adequate cooling.

Package Contents

• 2 × L12-2 amplifier PCB kits

• Electronic components for assembly of the two amplifier boards

• Sanken-series output transistors for the selected kit version

Please note: This is a DIY component kit, not a ready-to-use finished amplifier. Soldering and assembly are required. The external power supply, heatsinks, amplifier enclosure, and speakers are not included unless expressly stated.

Applications

• DIY stereo power amplifier construction

• Hi-Fi audio amplifier projects

• Home audio amplifier development

• Electronics education and practical circuit assembly

• Custom amplifier enclosures and audio system integration

Important Notes

• Intended for experienced DIY electronics users.

• Follow appropriate electrical safety precautions when using high-voltage DC power supplies.

• Select suitable heatsinking and ensure correct electrical insulation for power transistors.

• Published performance figures are reference specifications rather than individually verified test results for every kit.

• For successful assembly, users should have suitable soldering, measurement, and electronic troubleshooting equipment.