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statman

"No-Dac" and "No-USB"

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I have not trying it myself but seems recent refinement has improved the quantisation noise. 

"recent refinement" - hardly , its just a low pass filter consisting of a cap and resistor, and another cap to block DC.  Sometimes the simplest solution is the best solution.

Combining the "no- dac" and the "no-usb" would simplify it even more , and could be even better.

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Heard Mick's no-dac approach in house recently, sounded very good. Main attribute was a 3D ball of imaging that had excellent front to back depth, clarity also first rate.

The device looked easy to put together, a $100 Amanero USB board taking the computer data (music stream) and a simple filter consisting of a couple of resistors and favourite film capacitor with RCA output. The thing didn't even need a dedicated power supply, drawing 5v for the Amanero from the PC USB line.

Steve.

Edited by Steve M

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Heard Mick's no-dac approach in house recently, sounded very good. Main attribute was a 3D ball of imaging that had excellent front to back depth, clarity also first rate.

The device looked easy to put together, a $100 Amanero USB board taking the computer data (music stream) and a simple filter consisting of a couple of resistors and favourite film capacitor with RCA output. The thing didn't even need a dedicated power supply, drawing 5v for the Amanero from the PC USB line.

Steve.

 

The JLSounds board is much better, it requires two separate power supply regulators, but has  better clock and implementation than the Amanero, imo.  But the Amanero is very easy to get going. 

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Hi @@statman, thanks for your contributions!

 

I would like to try this: do I just buy an Amanero board? What else do I need? Could you perhaps post a picture of your set-up?

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Hi @@statman, thanks for your contributions!

 

I would like to try this: do I just buy an Amanero board? What else do I need? Could you perhaps post a picture of your set-up?

 

Me too.

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Hi @@statman, thanks for your contributions!

 

I would like to try this: do I just buy an Amanero board? What else do I need? Could you perhaps post a picture of your set-up?

 Yeah I can do that, but not till weekend, I'll post a guide. Bear in mind you need a gutsy computer to do the pcm-dsd conversion, and with the simple Amanero set up, you will get popping noises between tracks, its not too bad, wont do any damage but it freaks out the anal audiophiles, and god knows there's a gazzillion of them. 

The JLSounds board sounds a lot better imo , but it needs mains power and transformers, and that can kill you if you are a beginner diyer.

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Yeah I can do that, but not till weekend, I'll post a guide. Bear in mind you need a gutsy computer to do the pcm-dsd conversion, and with the simple Amanero set up, you will get popping noises between tracks, its not too bad, wont do any damage but it freaks out the anal audiophiles, and god knows there's a gazzillion of them.

The JLSounds board sounds a lot better imo , but it needs mains power and transformers, and that can kill you if you are a beginner diyer.

Thanks! I can live with pops. I am not experienced with DIY so sounds like Amanero is the go for me.

Sent from my iPhone using Tapatalk

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post-112248-0-93292400-1454135172_thumb.

Ok, to build the simplest version of the no-dac you need an Amanero board, a pair of RCA connectors, wire, 2x 3K3 (3300) ohm resistors and 2x 1000pF (0.001uF) capacitors. If your preamp is cap coupled you dont need a set of DC blocking caps, but if your not sure put them in. The value will depend on the input impedance of your preamp, a tube pre with input impedance around 100K will be fine with 0.47- 1.0uF, solid state go up to 10uF.  If your not sure use 10uF. 0.47uF Auricaps shown here. 

I used 2200pf (0.0022uF) caps for the filter because they were already on tagstrip, but "correct" value is 1000pf, 2200pf will give a bit more attenuation of high freq noise. 

The gurus will tell you you need to use exotic caps, but the performance of the no dac will exceed the relative merits of different types of caps, use what you like. Even electros for blocking cap are ok, I really like the ELNA Silmics, but hard to get. If you use electros + terminal to junction.

Use pins 3 and 5 of the Amanero for the right and left DSD outputs. Any of the ground pins for grounding. So a wire from pin 5 goes to one end of a 3K3 resistor, the other end of the resistor gets connected to the 1000pF cap, the other end of this cap gets connected to ground. The junction of 3K3 and 1000pf is the output of the left channel. This gets connected to the blocking cap, and the other end connected to RCA hot connection, the middle pin.  The earth tab of RCA of course gets connected to earth. 

post-112248-0-86240200-1454135218_thumb. 

post-112248-0-21107000-1454135279_thumb.

Same for pin 3 which becomes right channel. 

 

Ignore the white wires, I was using Amanero for something else. And the pink, yellow, green wires on output.

 

 

For pcm-dsd conversion the easiest way is to use JRIver. First download and install the drivers for Amanero from the website. Then on JRiver- Tools- Options- Audio Device select as shown on pix.

You'll need to have the device attached for this to show up.

 

post-112248-0-52970100-1454135345_thumb.

 

 To encode pcm-dsd : Tools-Options-DSP Studio, select 2x DSD DoP . If you have native DSD files you can select Native , but for playing ordinary pcm files use DoP.

 

post-112248-0-86678900-1454135409_thumb.

 

And finally click mouse on Audio Path when playing and it will show DSD output 5.6Mz in this case. Keep the volume down initially to ensure pop between tracks is not an issue.

 

 

post-112248-0-75643500-1454135889_thumb.

 

This will be interesting to most of you brought up on opamps in output stages of dacs, here we are eliminating the opamps and the dac! 

The simplicity and lack of phase rotation gives a big sound, good imaging and soundstaging. 

Its a bit raw, but going to the more sophisticated JLSounds board makes it more organic and natural sounding. And Linux can be used which I prefer over Windows. And a mute board can get rid of pops.

I still prefer the no-usb approach which is even more natural sounding, maybe there's still a hint of digital with the no-dac , not so with the no-usb.

Some smart digital guy needs to figure out how to combine no-usb and no-dac!

 

 

 

 

 

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Wow well done statman! Amazing so simple. I will definitely give this a go next week when & if I get ten minutes free. The Amanero board has a muting out pin so you could probably use this to drive a simple muting circuit. I'll see if I can come up with something simple if you like. Might even post some scope shots too & see what a 20k sign wave looks like.

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