ProtoDAC EX TDA1387 Dual Mono with reclocking, resampling and galvanic isolation

Vincent_Fong · April 9, 2026, 9:12am

This is an improved version of ProtoDAC with the following upgrades:

Reclocked and Resampled to NOS mode with TI’s state-of-art SRC4192, and a high precision, low jitter and phase noise TCXO clock (0.1ppm)
Galvanically isolated from Raspberry Pi using NVE IL715E or TI ISO6740 to prevent noises from entering into the analogue path
Significant improvement in terms of background darkness, channel separation, sound stage, imaging, accuracy , cleanliness, transparency and bass response
Significant reduction of harshness and digital artifacts, now the sound from TDA1387 becomes even more analogue, very close to TDA1541(A)
Accepts up to 24bits/192kHz

YouTube:

The HAT and the DAC modules are sold separately. Below are the price options of the HAT:

Bare PCB: HKD30
KIT: HKD850 (advanced soldering skills required)
Completed Unit: HKD1100

Note that 1USD=7.8HKD

Vincent_Fong · April 9, 2026, 9:13am

Configurating TDA1387 to dual mono mode improves the channel separation, imaging and sound stage. Additionally, dynamics will also be improved especially for the bass response.

Pricing:

KIT: HKD100 (advanced soldering skills required)
Completed Unit: HKD250

Note that 1USD=7.8HKD