low pass filter for DSD

[merlin el mago]

Please abraxalito could you make the xover with standard capacitors values?

TIA
Felipe

 

[abraxalito]

C1 (50.6n) = 33n + 18n (in parallel) ; C3 (26.6n) = 22n + 4.7n

 

[merlin el mago]

Thank you!

 

[merlin el mago]

abraxalito works very well, thank you.

 

[abraxalito]

Which inductors did you use?

 

[merlin el mago]

0,82mH & 2mH.

 

[abraxalito]

Right, I know their values but what I meant was what kind/brand/manufacturer?

 

[merlin el mago]

Jantzen air-core.

 

[merlin el mago]

Changed to Janzen Wax Coil.😀

 

[merlin el mago]

@abraxalito it's necessary R2 or in your simulation is the output impedance of the source?

 

[abraxalito]

R2 is the source (ESS DAC's) output resistance yes. The filter does need to be driven from that source impedance. If you have a source with a lower output resistance then include a series resistor to get to 195ohm.

 

[merlin el mago]

Source is Amanero (USB-I2S)- DIYINHK (I2S isolator).

 

[merlin el mago]

I will ask Domenico from Amanero.

 

[abraxalito]

Good idea, I'm unfamiliar with it. I would guess its a logic gate giving you the DSD out. I would suggest adding your own flip-flop with a very low impedance power supply. Perhaps the DIYers on the 'no DAC is the best DAC' thread will have some suggestions?

 

[merlin el mago]

Dom don't answer, attached schematic.

 

[merlin el mago]

I prefer the SQ without flip flop.

 

[abraxalito]

The schematic is sheet 1 of 2. Looks like the DSD output header/connector is on sheet 2 as I can't find it on this sheet.

 

[jiiteepee]

<deleted>

 

[merlin el mago]

The schematic is sheet 1 of 2. Looks like the DSD output header/connector is on sheet 2 as I can't find it on this sheet.

Sheet 2 can be the attached now?

 

[merlin el mago]

Amanero output impedance 50 ohms but I have between the Amanero and the 4th order LC filter the DIYINHK Amanero I2S isolator Free Amanero Isolator bare PCB Twin pack - DIYINHK, the output impedance is still the same like the Amanero?