Class D Audio Amplifier Reference Design

The 1000W Class D Audio Amplifier Reference Design provides examples of audio amplifiers and push-pull power converters. It runs using the KV1x Tower® Series platform or the k64 Freedom board.​

Schematic PCB

Woof Meter: Measure the TS parameters of the subwoofer

Woof Meter is used to test subwoofer speakers. It contains a low-frequency preamplifier, a precision full-wave rectifier and a DC filter.

Schematic PCB

Open source audio amplifier

The power supply has a stable symmetrical +/- 40 V to ensure optimal performance.
Maximum power (THD 1%) approaches 100 W into 8 Ω load and 190 W into 4 Ω load (see measurements). All parts are through-hole, making it easy to build the amplifier. The design is completely symmetrical.

Schematic PCB

Headphone amplifier based on OPA2188

It uses OPA2188 operational amplifier for large loop feedback and 2SC4672 as Class A and B output stage high-fidelity audio power amplifier, suitable for use with high-impedance headphones.

Schematic PCB

Bluetooth power amplifier board based on TPA3110

Using TPA3110 digital power amplifier chip, the power can reach 15W, and there are two power interfaces. The Bluetooth part uses bk8000L finished module, which has good performance and affordable price. Supports button playback and pause, track switching, volume adjustment, and also supports external audio line input and microphone input. After testing the finished product, the sound quality is good, the Bluetooth connection is relatively stable, the button functions are normal, the external audio line input is normal, and the microphone calls are normal. A complete AD project file is provided, which can be modified as needed, and the BOM needs to be exported by yourself.

Schematic PCB