Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

PC Based Computer music servers, crossovers, and equalization

Getting the best out of Allo.com's new Katana DAC...
Getting the best out of Allo.com's new Katana DAC...
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 16th January 2019, 11:32 PM   #201
Jonathan P is offline Jonathan P
diyAudio Member
Join Date: Dec 2018
@Markw4, Not sure it's doable but what about reverse engineering such filters from a 10 000$ DAC from Ayre for example?
  Reply With Quote
Old Yesterday, 12:04 AM   #202
Markw4 is offline Markw4  United States
diyAudio Member
Join Date: Jul 2016
Location: California
The filter coefficients and number of taps is not the hard part.
  Reply With Quote
Old Yesterday, 12:47 AM   #203
Jonathan P is offline Jonathan P
diyAudio Member
Join Date: Dec 2018
All right. I did some basic digital circuit design and FPGA flashing back in University but in terms of DAC interpolation filter design, you lost me already...
So I guess I'll sit tight and hope you get the chance to work on that someday

In the meantime, I'll focus on getting some decent PSU according to Greg's "audio friend"'s setup.
Would you mind, if you have the info, specifying the exact models of toro transformers he used for:
  • Katana/MC
  • OPAMP Output Stage
Antek have like 20+ variations of 50VA transformers on their site.

For the output stage, I'm considering another option:
Twistead Pear's toroidal transfo 15V+15V (50VA) Power Transformer
I would have expected > 15V in order to get the final 15V out of the Placid HD BP 2.1 but if I understand correctly, it is meant to be used with it so I guess it's fine?
Any opinion how its performance would compare to your friend's Antek transfo?

  Reply With Quote
Old Yesterday, 04:52 PM   #204
jrocker is online now jrocker
diyAudio Member
Join Date: May 2017
Jonathan P:

This one is easy. For the opamp output stage and the TP Placid HDPS, TP specifies and sells a 50VA unit from Avel, model Y236203, see: http://www.avellindberg.com/pdf/avel_y23_range.pdf. The price is $27.

The Antek unit is basically spec'd the same, see:AS-0515 - 50VA 15V Transformer - AnTek Products Corp, but it also has an electrostatic shield. The price is $17.50.

"Audio Friend" called out the electrostatic shield. That was the rational. Digital on one side and the TP HDBP supply on the other supplying the analog output stage. If you need it, great. If not, well - my experience is they sound the same.

As to the cost difference, there's shipping to be considered too. You can combine shipping with TP - the Avel unit and the Placid HDBP supply. So, pretty close.

As to the Kantana DAC board and the micro controller, each using half of the DIYINHK LT3042 regulator board - the board can be configured for either 3.3 or 5 or 7 volts. Obviously, the application here is 5 volts. There's some writing on the board that states a range for the AC input as I recall. Basically, if you're too high, you generate some more heat in the regulator. If you're too low, you drop out of regulation. But, there's not much current here - something like 20mA for the micro controller when the +/-15 is supplied externally, and 165mA at startup and 80-100mA for the DAC when music is playing (those numbers from the Allo spec sheet doc). So, even if you have an extra volt - that's 0.02 and 0.165 watts respectively under worse case conditions. Power dissipation is more steady state though...

It is an LDO reg too. And, this is the low noise application... And, with a 50VA transformer the secondary voltage is going to float a little high due to the light load.

6+6 will work or 7+7 allowing for some other application for the supply in the future. Antek is you're friend again, or even Avel. There's nothing really magic here. All of these toroids are machine wound. Again, they sound the same IME.

Here's a treatment of the tradeoffs from an engineering perspective:

Dimdim's Blog | DIY Audio, Arduino, Computers, Music

There's some margin of error and some guess work involved. From the perspective you're in, at least. So, that's what to pick and a source or two.

It appears was though I may have gone to talking down to you. Please don't take it that way - just trying to help and answer your questions throughly.

Last edited by jrocker; Yesterday at 04:55 PM.
  Reply With Quote
Old Yesterday, 10:35 PM   #205
Jonathan P is offline Jonathan P
diyAudio Member
Join Date: Dec 2018
@jrocker, Thanks for your answers!

Greg already gave some hints about soldering quality and all but I'm wondering what you guys use in terms of:
  • Solder diameter for assembling the Placid HD BP 2.1
  • Solder + flux paste or flux core solder
  • Wire gauge for connecting power directly to katana, MC, RPI
  Reply With Quote


Getting the best out of Allo.com's new Katana DAC...Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Allo Digione pistollero Swap Meet 9 13th December 2018 09:05 PM
FS - Inca Design Katana SE CD Player powershot Swap Meet 1 27th February 2011 10:05 PM
Inca Design Katana problem.. audio1st Digital Source 6 26th October 2007 01:50 PM
Allo Allo! ianpengelly Introductions 5 30th October 2006 09:31 AM
Allo All BraClay Introductions 5 9th January 2003 04:50 PM

New To Site? Need Help?

All times are GMT. The time now is 08:29 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio