Linear Power Supply - Raspberry Pi

[Archive-8]

Could anyone please explain to me any advantage to using a linear power supply for my pi3 running Rune,compared to a wall wart.

Thanks.

 

[archive10]

One thing is clear: The switched mode takes up much less space than the linear (and weighs much less).

While I can't say I've built any PSUs, I seem to remember that the switched mode generate lots of high-frequencies when operating (that's how they work), whereas the linear works around the frequency of the input AC (in this case 50Hz).

This means that the input power may a) contain stray harmonics and beat-frequencies (interference-caused), and b) contain high-frequency noise; both of which can find their way into the (analogue) audio circuitry if used.

IF, on the other hand, you are using an outboard, and preferably optically connected (galvanicaly isolated) D/A, there should be little or no impact from using a switched mode PSU instead of linear.

And that, is where my knowledge on this topic ends...

 

[Archive-8]

Right now I am using my pi with the USB dac, I am still waiting for my digital out board.


But thanks for answering my question.

 

[pgh13]

One thing is clear: The switched mode takes up much less space than the linear (and weighs much less).

Size and weight due to the size of transformer - lots more copper wire, hence more expensive to produce