Last year's EOL was for the SOIC version of the CS8406 and I thought we'd be safe with the TSSOP version used in my mod, but unfortunately the day after your reply Cirrus Logic EOL'd the TSSOP version as well. If anyone's planning on building one of these things please place your orders for the CS8406 while they're still available. I plan on redesigning the board to use the DIT4192.NewSchoolBoxer wrote: Thanks for including the BOM. I see the CS8406 your, FirebrandX's mod and older version of borti4938's mod still for sale was obsoleted with an end of life notice 12 months ago. Not surprisingly of stock.
The CS8416 is a digital audio receiver and isn't suitable for this application.NewSchoolBoxer wrote: I assume the [more expensive] $10-12 USD CS8416-CZZ is the intended replacement.
This is something I was meaning to measure but forgot to do it. Thanks for reminding me! The next time I have one on the bench I'll try to remember to do this.NewSchoolBoxer wrote: --Can you measure the power consumed and ambient operating temperature at the highest resample rate or is that not meaningful?
No, there's no standby mode and it continuously resamples and outputs whatever is produced by the APU.NewSchoolBoxer wrote: --Is the mod in standby mode or something akin to that when Super Game Boy or MSU-1 audio is running?
plgDavid has done extensive measurements and his video about the research behind chipsynth SFC indicates that the digital audio they produce is practically identical. I did a quick check too, just a simple inversion test with a regular SNES with a DIT4192 and a SNES Jr. with a CS8406. Due to the differences in state at boot (explained starting at 10:42 in the video) the cancellation isn't perfect, but there are sounds that are cancelled completely which implies that they can be bit perfect.NewSchoolBoxer wrote: --Can you confirm if 1CHIP has inferior audio to 2CHIP? I'll test this myself but I'm biased in thinking 1CHIPs are cheap cost reduction machines with the SNES Jr/Mini being almost a clone console. Important distinction when 2CHIP digital mods are much more difficult.
By digital reduction in noise do you mean the difference between the analog audio produced by the NEC DAC inside the console versus a pure digital signal? If so, the most audible differences are the elimination of 50/60 Hz hum and 15.7 kHz interference, and the lack of low pass filtering. A lower noise floor can be audible when using a high quality DAC, but is less noticeable. If you're asking about a potential reduction in noise from the 24-bit output of my mod, no, the noise floor is limited by the 16-bit PCM samples from these consoles.NewSchoolBoxer wrote: --Can I ask what we refer to in American English as the 800-pound gorilla in the room question? At sub-CD audio with arguably high noise floor, which is to say SNES and N64, is the digital reduction in noise significant enough to make any audible difference? I was discussing that with Ikaruga11 and I predicted definitely not for 3.56:1 audio compression ratio, expected 32 kHz DAC SNES. Maybe yes for N64 from the rare game coded to use 44 kHz sampling. By extension, I think going up to 24-bit, 192 kHz sampling, 24 Mbps is silly but not going to hurt anything.
My apologies for the lateness of my reply!