Hi Richard,
I got all the background for the I/V conversion from this rather long thread on Diyaudio, it is certainly worth scan reading. The best I/V schematic uses pin 5 TZ as the output to feed the buffer, don't use pin6. The OPA627 buffer is also shown in the thread:
https://www.diyaudio.com/forums/digital-line-level/227677-using-ad844.html
The ideas I used for the TDA1541a supply pin decoupling cam from here:
https://pinkfishmedia.net/forum/threads/arcam-and-the-tda1541.29579/
The I2S pin outs on the raspberry pi are shown here:
https://raspberrypi.stackexchange.c...irming-the-i2s-pins-on-raspberry-pi-3-model-b
The Allo FIFO board has the same pins outs for the I2S signals
I built the DAC itself from scratch and is extremely straightforward. The rough schematic is the third schematic here:
https://www.tnt-audio.com/clinica/tnt1541_e.html
However, I used ALWSR for the PSU's and don't fit resistors R310 and R311 if you use the AD844 I/V stage.
Hope that helps a bit
