T O P

My current DIY PowerDAC - 16/384 DAC with 8W tube buffer. More details in comments.

My current DIY PowerDAC - 16/384 DAC with 8W tube buffer. More details in comments.

dr_Bar-mental

This 8W per channel stereo amp doesn't have an analog inputs as I don't have analog music sources anymore. It's my second project featuring an industrial open R-2R matrix DAC chip in audio gear. Most of audio DAC chips have an OP amp as a buffer so feedback-free topology cannot be used. Output buffer/amplifier is two-stage Class A one with a twist to isolate power supply capacitor from the sound path. For the same reason batteries are in use in reference/biasing circuits. Also there is no output filter for better phase responce and, as the result, exceptional soundstage. To my surprise, leaving fundamental frequency (44.1kHx or higher) unfiltered doesn't degrade sound performance and safe for speaker twitter as max power is 8W only. It took me 4 years (2010-2014) to complete this project from the design concept. Recently upgraded to have an USB input with ASIO/ALSA compatibility.


AllThePizzaYouHave

Holy frick dude . This is awesome. Here I am trying to build a radio. One day, one day. It’s a beautiful setup congratulations on the final product.


dr_Bar-mental

Thank you, mate! It takes time...


AlaskaTuner

hoolllyyy crap man, I have been researching diy audio gear designs for years in attempt to string together a set of components to achieve a similar goal as your unit gets done in a single package. I'd love to build one! Do you plan on releasing plans or selling components as a kit?


dr_Bar-mental

Honestly, I didn't think of it yet. :) The main purpose of my post was to share some crazy approach to high-quality digital audio, mostly for entertaining. It's an old project and currently I am working on ultimate USB audio interface to PC using the same ideas.


RealLordTequila

Fucking hell. R2R Tube PowerDAC- with a headphone output to boot! Sell this for $8K and it'll sell like hotcakes.


dr_Bar-mental

You know, maybe it's a fair price - I have spent around $2k AUD on that project plus countless hours...


dnv21186

You should definitely pull a capitalism on this piece of work


Gbud350

Beautiful.


onejoelooking2

I'm impressed, excellent workmanship! Enjoy!


dr_Bar-mental

Thanks!


thegarbz

Beautiful work. Despite what I think about feedback / filtering / R2R I love the thought and attention to detail you put into this. Isolating the digital and the analog side is something that I continue to see left out of even commercial equipment. And a CPLD to boot Kudos!


78oj

Looks great, did you have a chance to measure it for THD, etc. Either way, publish or sell the Gerber's, BOM and schematic and I would be happy to cough up some hard earned cash.


dr_Bar-mental

THD measurements look ugly as it doesn't have post-DAC low pass filter but sounds surprisingly OK.


Top_Try4286

I’d rather see the insides


dr_Bar-mental

New post with some robots porn is coming soon! :)


Theodore_alberts

Looks pretty cool


dr_Bar-mental

Ta!


Shertzy

Awesome!! What type of iron is in there?


dr_Bar-mental

Output trafos are JamesAudio, the ones with teflon insulation. The rest, honestly, I don't remember. :)


FST251

WOW! Impressive and perseverance! Well done.