Jeroen's Project Journals

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  • 3-channel audio amplifier. Mains-powered and with digital volume control. Includes a 3D printed enclosure matching the Teensy DSP/DAC, OLED display and rotary click-encoder control

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More issues fixed

2024-08-29

Finally! As I am typing this I am in fact listening to music through the amplifier, but getting here was not without headscratching and some strong language:

The amplifier board installed in the enclosure with an external power supply connected using alligator clips. The power supply display indicates it is outputting 109 milli amps at 12 volt. Several of the LED's on the board are lit, indicating it is powered on. In the background a monitor with part of a PCB design is visible

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PCB works now!

2024-08-21

Success! Adding a level-shifter works as expected and the setup you see in the image below lets me control the volume of a single channel, and it actually sounds good:

Desk with circuit boards and a breadboard connected with jumper cables. In the background a bench power supply, oscilloscope and a DAC in white enclosure, surrounded by odds and ends such as solder wick, tweezers and a strip of pin-headers

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PCB doesn't work

2024-08-18

This project was on the backburner for quite a while, but a few weeks ago I finally ordered the PCB’s, and they arrived last week:

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PT2258 Volume Control

2024-01-09

The PT2258’s arrived, and I built a breadboard version of the reference schematic found in the datasheet:

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That's a relief!

2023-12-28

So I reinstalled the 12V MeanWell PSU, wired everything back up minus the volume control boards, and now everything seems to be back in working condition. So that’s a huge relief!

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Carrier board design

2023-12-27

I’ve been going back and forth on this carrier-board design for a while now. The current iteration looks like this:

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Introduction

2023-12-26

For my Concrete Subwoofer, along with a DSP/DAC, I needed an amplifier. I decided to create a 3-channel amp using cheap mono amplifier modules based on the TI TPA3118 class-D amplifier chip. These modules are cheap and I already had one lying around from another project. So I ordered 2 more and designed an enclosure with room for the 3 modules and a small MeanWell power supply, a front-panel fitting a rotary encoder and display and a rear-panel with the mains inlet, line-inputs and speaker-level outputs:

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