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dhbiker 7th June 2012 05:40 PM

HLLY DIY DAC ... is it any good ?
hi there

i just stumbled upon this: HLLY DIY DAC

now i'm curious if its any good... it says USB section is connected via I2S to DAC.. so i guess it can be modded to another source too

your opinions ?

thanks for your reply

qusp 7th June 2012 07:41 PM


now i'm curious if its any good...
not really no, design/layout looks pretty average, as are the parts IMO. receiver is not great, usb is pretty dodgy and decoupling is not what I would call local or effective

dhbiker 7th June 2012 08:28 PM


i will ask here so i dont open up a new thread...

what kind of dac would you reccomend for like 250$ ?

i saw one massive thread about gigawork DAC:

but still i want to know what are the alternatives :D

s3tup 7th June 2012 09:47 PM

There are two DACs over eBay that look promising for the $$/performance.
The first one is an interesting TDA1547 which i bought today. It's just plain interesting to hear the old deltasigma in such uncommon way (separate DF, modulator and DAC ICs).
The second one is SMSL with AD1955 and TE7220. This one looks good if you need complete DAC in a box solution. It is really cheap for what it has on the board. There is no caps on the output which is a good thing.

But... These are KITs. Circuits with suboptimal performance which you could fix into something wow-sounding.

That gigawork worth 30$ :)

dhbiker 7th June 2012 10:20 PM

links ? :D

i like such kits... and i don't plan to leave anything original :D

Rodeodave 7th June 2012 10:50 PM

I have been looking at this DAC, and I came to the conclusion that it's not very good, for the following reasons:

The USB input looks like a very standard PCM2707 with a simple quartz oscillator. That implementation can be found for a few dollars all over ebay. I think that clock signal via the I2C is used all over the DAC, so I would look for an implementation with more effort in this area (maybe even TE7022).
The tube is an output buffer only I think, rather than being in the I/V stage.
I'd also like to see more regulators and a more compact layout...

wwenze 8th June 2012 01:16 AM

From the eBay link

Hmm...? ;)

I remember the bottom to look more like this:

DreadPirate 8th June 2012 01:29 AM

The smaller value nichicons have the flat bungs, rather than the channeled one in the lower picture. Their absence is not a sign of not being authentic.

DreadPirate 8th June 2012 01:31 AM

What is the opinion on this ebay dac, the SMSL SD-793? Seems like a nice package for the price.

SMSL SD-793 Mini DAC DIR9001 + PCM1793 + OPA2134 Decoder Optical Coaxial & RCA B

audible1 8th June 2012 02:08 AM

I bought from Hlly a DAC completed unit. Apparently his new unit 24/96. It doesn't work. Sent it back to China, unit spent several weeks, then returned with same fault - only intermittently has any sound output.
Do not advise buy Hlly products. I left negative eBay feedback. Many emails to seller not replied after trying to contact for support.

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