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Custom Home Amplifier
A four-channel Bluetooth home audio amplifier with a touchscreen, remote control and a 3D-printed enclosure tuned for its own sound profile.
- Type
- Freelance
- Period
- Feb 2026 – present
- Location
- Mumbai, India
- Status
- V1 built, 8-channel upgrade in progress
Overview
A custom home audio amplifier built end to end: Bluetooth streaming, four selectable audio inputs, a touchscreen for control, IR and Bluetooth remotes, and an enclosure designed to give the amplifier its own hardware audio profile.
Audio and firmware
- ESP32 firmware that receives Bluetooth A2DP audio and streams it over I2S to a DAC.
- Four selectable inputs (Bluetooth, TV, RCA 1, RCA 2), with a TDA7439 audio processor over I2C controlling volume, bass, mid, treble, gain and balance.
- Per-input saved profiles (volume, tone, gain, balance) kept in non-volatile memory, with default recovery.
- Amplifier power sequencing with relay, mute, subwoofer and fan control.
User interface
- A DWIN touchscreen over UART with sliders and settings pages.
- IR remote control and a debounced touch power switch.
- Bluetooth remote control, added in the latest update.
Enclosure
The complete enclosure is built from 3D-printed parts, designed and tuned to a target frequency to create a custom hardware audio profile.
What's next
I'm now developing an 8-channel version, with frequency splitters ahead of the amplifier stage.