04-03-2021, 12:49 PM
@Blooze
Do you have access to a 5Vcc / >1A linear power supply or switch-mode power supply (the official RPi SMPS would be good enough) so you could test JUST the RPi ZERO with the JustBoom HAT...? The 5Vcc would be fed to RPi which in turn feeds 5Vcc to the HAT via the multipin connector; you can test the sound via the 3.5mm heaphone port (low output power so suitable headphone required) or, better, connect a 3.5mm-to-RCA stereo cable from the Line Level 3.5mm port to a proper amplifier.
Do not use any other HATs, devices, addons or the power supplies you've mentioned before... just to prove where the 'noise' problem is coming from... Do not use for this test the 30V PSU you are using for the tube headphone amplifier.
The final power setup should have TWO independent power supplies (transformers et al), no buck converter involved...
Do you have access to a 5Vcc / >1A linear power supply or switch-mode power supply (the official RPi SMPS would be good enough) so you could test JUST the RPi ZERO with the JustBoom HAT...? The 5Vcc would be fed to RPi which in turn feeds 5Vcc to the HAT via the multipin connector; you can test the sound via the 3.5mm heaphone port (low output power so suitable headphone required) or, better, connect a 3.5mm-to-RCA stereo cable from the Line Level 3.5mm port to a proper amplifier.
Do not use any other HATs, devices, addons or the power supplies you've mentioned before... just to prove where the 'noise' problem is coming from... Do not use for this test the 30V PSU you are using for the tube headphone amplifier.
The final power setup should have TWO independent power supplies (transformers et al), no buck converter involved...
