On 23/08/2019 11:26, A. Dumas wrote:
> Op 23-08-19 om 10:43 schreef Ahem A Rivet's Shot:
>>> And the DACs in pis are cheap and nastry tech too.
>>
>>     That they are.
>
> It does not have an audio DAC chip, or any DAC or ADC chip.

It still has a DAC though

Even if its a couple of PWM outputs from te Pi main chip

Audio
> circuit schematic for the Pi4 at the bottom centre here:
>
https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/rpi_S
CH_4b_4p0_reduced.pdf
> (audio is identical on the 3 en 4 but they cleaned up the drawing a bit
> in this version)

Where is the rest of the schematic? What drives PWM1_MOS1 and 2?

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