I would like to separate the power from the pi and the pi-dac from IQaudio (iqaudio.com/?page_id=28) using linear power supply rails (5 and/or 3.3v).
I did exchange some emails with gordon and read the product doc file : iqaudio.com/wp-content/uploads/2 … IO_Doc.pdf :
- Extreme hacking (Raspberry Pi Pins)
For those who want to do things like Power the Pi DAC from a separate power source than the Raspberry Pi itself the following may be of help although we do not recommend using the Pi DAC in this way.
The following Pi Pins need to be connected to the corresponding PiDAC headers for audio to work. We recommend that the other Raspberry Pi ground pins are also connected.
P1 (26way): 3 (I2C SDA)
5 (I2S SCL)
P5 (8 way): 1 (5v)
4 (I2S LRCK)
6 (I2S DATA)
- I did not understood why there is two “3.3v sources”. any suggestions ?
- Did I have to “merge” the grounds from the 5V and 3.3V ?
- Considering (this is a personal assumption) that the 3.3v is for the digital treatment and the 5V is for the anagogic treatment, would it make sense to use the 3.3V from the pi and the 5V from a linear psu ?
thanks for your help