[Reactcore]

Very impressive. Aside from the improved casework it’s astonishing the lengths people will go to in order to remove the RF issue, one which Rob Watts regards as trivial. For others, apaprently not!

For me it was worth every minute of my time.

It lets me enjoy every detail unmasked..
Now i can fully hear what 1M taps can do.

I feel sorry for the ones that sold their Mscaler cause of it..

But youre right.. it shouldnt be needed in the first place.

 

[Reactcore]

So i did a little test.
I connected a additional toslink cable between Mscaler and Dave and set the scaler to 192k.

Now A-B between this and my optical link.
I tried hard on different songs but can hear zero difference on this bitrate between them.
But then i skip to M setting.. ohmy..

Both are RF free in this test.

 

[Jawed]

Very nice work.

For optimal sound quality I suspect 1m or more spacing between your Choral M Scaler and DAVE will be worthwhile.

 

[Reactcore]

Very nice work.

For optimal sound quality I suspect 1m or more spacing between your Choral M Scaler and DAVE will be worthwhile.

The distance makes no difference anymore since no coax is running outside the housings.

 

[dac64]

Nothing except envy your technical competency!

 

[JamieMcC]

This is just insanely impressive I'm just bowled over at your achievement.

 

[Reactcore]

As promised for all you DIY'ers wanting to make the dual data link themselves..

I've drawn a schematic of the circuit:

This one works now in my Mscaler. It uses a 4x NAND driver chip.
Since the AFBR2418 receiver inverts the output (a logic 1 becomes a 0 and visa versa), the TX side must invert too.
Offcourse you need to make two of those.

Note: Be careful not to overdrive your TX led by adjusting R2, R3 or R4 too low resistance (=more LED current)!!
Starting point should be R2 & R3 = 33ohm and R4=270ohm, the value of R1 and R5 cant damage anything

Alternatively i also drawn one using AND gates logic, but this i havent build and tested yet.
If someone does, i would like to know how well it works.

The Avago 820nm units i used are plastic ST barrel types, there also types with a metal barrel and with threaded connector (like the Opto DX)
You need OM2 62.5/125 or OM3 50/125 fiber cable to connect them.

Happy modding !!

 

[Reactcore]

I never came across a picture of Mscaler's FPGA 'engine' before i opened it up..

So here one after i cleaned the heatpaste off it to apply new.

Now what to do with this

 

[Reactcore]

I should be working designing a drive PCB
But i cant..

This is insane ..i can hear so much deeper into my music now its free if this RF devil..
im glued on my seat 🛋

 

[GuiltyRocker]

Very impressive all around sir, amazing job.

 

[motu81]

Have you compared it to the Opto DX?

 

[Reactcore]

Have you compared it to the Opto DX?

No i havent heard it.

But i did have my optic link on batteries like Opto dx.. but i noticed improvement by just placing it inside Dave's shielded casing losing the coax outside.

I found coax is even being sensitive to radiated RF through the air. Hence why people hear improvement if they keep distance between their units.

Also i have no regulator to power it.
Just a simple as possible circuit.

Opto dx uses coax and also uses 12v while logic driver chips work on 5v so there must be more inside that box than needed.

Btw i almost have my driver PCB design ready.
But its in Autocad.. i must find a place that accepts a DWG file to produce.. or i need to convert it

 

[Reactcore]

Ok i made my dual channel drive PCB quite small about 28x50mm with 2 SSOP14 logic chips on a single copper layer.
A second layer might bring more bad than good (track capacitance)

Im so oldschool lol ..I need a Gerber of it to let it be manufactured.. but how to make that

 

[miketlse]

Keep going.
Often 'old school' means that you are using calculations/software/formats etc that have been in existence long enough to be 'debugged of errors' that could problems for users/designers.

 

[paulrbarnard]

Ok i made my dual channel drive PCB quite small about 28x50mm with 2 SSOP14 logic chips on a single copper layer.
A second layer might bring more bad than good (track capacitance)

Im so oldschool lol ..I need a Gerber of it to let it be manufactured.. but how to make that

Take a look at KiCAD. Fantastic free layout software.