hello,
i guess we can add to this list our own PIANO 2.1 DAC working with any SBC/RPI (i2s)
We are using 2 DAC ics PCM5142 with integrated DSP. The PurePath software from TI is available for download (registration required) and can be used to create specific filters and other audio functions.
The board will come pre programed as a 2.1 output (but you can create your own custom design and load it the board and can access the xover frequency directly from linux (we made a small app)
Hardware wise , we have split the digital and analog side with LDOs and we feed the analog side using an extremely capable (low noise ultrahigh psrr) LT3042. Basically each board has 4 LDO (2 for each DAC ic) (note that digital side uses cheaper LDOs)
Of course , on the analog side we used only thin film resistors and poly caps in audiopath.
This DAC has RCA outputs but also a small connector that will connect to our TPA3118 AMP shield (only LR)
Adding to this, the reclocker shield for RPIs/SBCs.
Basically the main idea belongs to Ian’s. His hardware is actually superior to ours , mostly in the way he implemented the clocks and to the attention of the detail (like mounting xtals on a pcb supported by elastics ). So we credit Ian’s idea and his great design.
Our hardware/soft is not a copy , its an implementation of the same idea. We use a FPGA and sram to buffer the DATA and we reclock bclk/mclk outside the FPGA using NDK (or Crystek) . The board has an eprom but its not HAT complaint (because of the space). FCC will be available for the board.
Main reason for making the board was to try to correct the audio clocks of SBCs and bring high quality audio to anyone that has an SBC around…for a great price.
We are looking to send a few systems out for testing to VOLUMIO memvers.
… a high-end Raspberry Pi sound card with two WM8741 DACs in mono mode, ultra-low phase noise oscillators,
ultra-low noise linear regulators and Lundahl output transformers.
Well, why not just try it and we will know.
Why does this particular post seem familiar to me, where did I see those identical pictures?
But posted under another name?
Hello everyone,
I would like to introduce my new DAC:
24bit 192kHz
Burr Brown PCM1793
Sound-Plus High-Performance, JFET-Input Audio OpAmp
Susumu thin film resistors
Nichicon audio capacitors
WIMA FKP for filtering
Low-Noise regulators
This DAC works with an external power supply, it requires ±15V
The supply for this DAC is completely independent from the Raspberry. This is one of the reasons for excellent audio quality
• 24-Bit Resolution
• up to 200kHz sampling frequency
• Dynamic Range: 113 dB
• THD+N: 0.001%
• Full-Scale Output: 2.1 V rms
• 8× Oversampling Digital Filter
• Power supply +/- 15V
GY-PCM5102 is a tiny purple i2s DAC with a line out stereo jack, and costs as little as $4. It can be found on Aliexpress, eBay and Amazon. I wired it to a Raspberry Pi Zero W, as in the photo, and selected the HiFiBerry DAC device setting in Volumio. It appears to be working well!