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Old 28th April 2012, 02:32 PM   #1
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Default Twenty bucks for a complete DAC solution? How good could it sound?

I saw this while poking around Amazon's site:

"Digital Optical Coax to Analog RCA Audio Converter Adapter" - $19.47, with wallwart power supply

Specs say it supports up to 96kHz/24bit PCM, but not sure if it is doing any downsampling.

Maybe it sounds halfway decent? Possibly a giant killer? Or maybe it really is only worth twenty bucks.
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Old 28th April 2012, 04:53 PM   #2
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"supports sample rates at 32, 44.1, 48 and 96 KHz"
This points to the early versions of Tenor (TE7021L) USB cip (doesn't do 88.4kHz and, based on that, I think 44.1 is internally resampled).

Last edited by SoNic_real_one; 28th April 2012 at 04:56 PM.
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Old 28th April 2012, 05:35 PM   #3
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It doesn't cost much to put a receiver and dac chip on a PCB in mass quantities. Would be nice to know the chipset. C-Media, maybe?
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Old 28th April 2012, 06:06 PM   #4
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UDA1351TS? It is 96kHz with integrated DAC and SPDIF receivers. Single chip DAC
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Old 28th April 2012, 06:35 PM   #5
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Hi, I made quite a few DACs with that UDA1351TS chip and it sounds afwul. I don't say this because I sell DACs but just to warn you. It produces sound and nothing more. To be honest: I recently threw away a batch of these DACs I made myself as I could not even want to sell them. Spend a few more $ if you want something that sounds OK.
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Old 28th April 2012, 07:44 PM   #6
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I recently purchased the FiiO D3 for $30. It uses the Wolfson WM8805. I also bought an AD8656 opamp to replace TI LMV358. Haven't changed it yet. The device sounds great to me.

Here is a review: Inside FiiO D3 H i F i D U I N O
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Old 28th April 2012, 07:53 PM   #7
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Hi I think you will have even better results if you put a true voltage regulator in the FiiO instead of the too simple zener diode. There exist nice TO92 3.3 V regs for that purpose. The Wolfson is very good and it deserves a good power supply so it can perform optimally.


I do not understand why they are so positive about the zener diode in the link....
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Old 28th April 2012, 08:57 PM   #8
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Thanks Jean-Paul. That's a great idea. I think I'll do that when I change out the op-amp. Can you recommend a good TO-92 3.3V regulator for this application?

Thanks,

Scott
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Old 28th April 2012, 09:03 PM   #9
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Haha, zenner is "Shunt regulation"... It's the new fad.
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Old 28th April 2012, 09:39 PM   #10
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Quote:
Originally Posted by scitizen17 View Post
Thanks Jean-Paul. That's a great idea. I think I'll do that when I change out the op-amp. Can you recommend a good TO-92 3.3V regulator for this application?

Thanks,

Scott
Hi Scott, I think MIC5207-3.3YZ is among one of the better ones if you can still find it (out of production). LE33C is OK too.

LE33CZ - STMICROELECTRONICS - IC, V REG LDO +3.3V, TO-92-3 | Farnell Nederland

Anything better than a Zener diode I would almost say. Please do not use LP2950, it is way too noisy.
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