My 2.1 amplifier design using a TPA3255


2020-03-09 7:41 pm
Hi all,

I just finished the PCBA design for a 2.1 amplifier using a TPA3255. The order has been placed at JLCPCB, and I will try to keep this thread up to date. Some specs:

- 2 x 50 Watt, and 1 x 100 Watt for the sub. The TPA3255 could deliver more power, but this increased THD dramatically. Also, I don't need more power.
- Post filter feedback implemented to improve audio quality
- Microchip BM64 bluetooth module with an external PCM5102A DAC.
- Low, high and loudness controls
- 4th order adjustable (in both frequency and volume) subwoofer crossover
- 2 aux inputs

All opamps are LM4562. It can be powered with a voltage from 24 to 36V. It will be used with a set of Overnight Sensations. I would like to add a subwoofer, hence the 2.1 amp. The top layer of the PCA is included in the attachment. When the PCA arrives I will place an update with a review of the quality. Since JLCPCB is incredibly cheap I am a bit suspicious. It is a 4 layer board, most of the SMD components will also be placed by JLCPCB.


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