InnoMaker Digi One Hat for Raspberry Pi - Bitperfect S/PDIF Output

In this review the InnoMaker Digi One Hat is evaluated as a specialist S/PDIF audio hat for Raspberry Pi users who want clean, isolated digital output. The bottom line: this board is for audiophile hobbyists and media system builders who need a reliable, bitperfect optical or coaxial digital feed from a Pi. Its main selling point is galvanic isolation combined with low jitter clocking, which together reduce noise and improve clock accuracy compared with a Pi's native outputs.

Key Features

• S/PDIF interface: Provides IEC60958-3 compliant optical TOSLINK and electric RCA outputs for true bitperfect digital audio delivery up to 192kHz.
• Wide sampling support: Handles 32 to 192kHz sampling rates so it works with common PCM sources and high-resolution files without resampling.
• Low jitter clocking: Dual low jitter external crystal oscillators and I2S master mode improve audio clock accuracy across frequencies.
• Galvanic isolation: Uses a 150M industrial digital isolator and a 1W power isolator to separate Pi power and digital signals for cleaner output.
• Wide software support: Compatible with major Raspberry Pi music player systems such as Volumio, RuneAudio, Moode and standard Linux distributions.

Who It's For

The Digi One Hat is aimed at Raspberry Pi owners building a dedicated digital transport, HTPC, or network audio player who plan to feed an external DAC or AV receiver via TOSLINK or coax. Enthusiasts who value jitter reduction and electrical isolation will get the most audible benefit in sensitive systems.

It is less appropriate for casual Pi users who only need analog headphone output or an all-in-one USB DAC solution; those buyers should look for simpler USB audio devices or HATs with built-in DAC stages instead.

Pros & Cons

Pros

• Provides bitperfect S/PDIF output for clean digital transfers to an external DAC.
• Galvanic isolation of power and digital signals reduces ground noise and interference.
• Dual low jitter crystals and I2S master mode yield more accurate clocking across sample rates.

Cons

• Does not include a built-in DAC or analog outputs, so a separate receiver or DAC is required.

Specifications

Our Verdict

The InnoMaker Digi One Hat is a focused solution for Raspberry Pi audiophiles who need reliable, isolated S/PDIF output to an external DAC or receiver. Its combination of galvanic isolation and low jitter clocking offers tangible signal quality benefits for critical listening setups, making it good value for anyone building a dedicated Pi-based digital transport.

Frequently Asked Questions

Does this HAT support high-resolution audio?
Yes, it supports sampling rates from 32 to 192kHz for PCM playback.

Will it work with my Raspberry Pi music player distro?
Yes, it is compatible with common systems such as Volumio, RuneAudio, Moode and standard Debian-based distributions.

Do I get analog output from this board?
No, the Digi One provides only optical TOSLINK and coaxial RCA digital outputs; an external DAC or receiver is required.