[pdupiano]

Does anyone know of a Diy balanced dac floating around the net? I was thinking of just making an inverter for my gamma 1 to get the signals necessary, but I'm worried about the possible phase shifts if I'm not careful. Before I go down that route, I'd appreciate any inputs, especially if anyone knows how to turn a gamma 1 into a balanced dac.

 

[naamanf]

Quote:

Originally Posted by pdupiano /img/forum/go_quote.gif Does anyone know of a Diy balanced dac floating around the net? I was thinking of just making an inverter for my gamma 1 to get the signals necessary, but I'm worried about the possible phase shifts if I'm not careful. Before I go down that route, I'd appreciate any inputs, especially if anyone knows how to turn a gamma 1 into a balanced dac.

Nope never heard of any

But you could start here Twisted Pear Audio

Also try the search function.

 

[Good Times]

Quote:

Originally Posted by naamanf /img/forum/go_quote.gif Also try the search function.

You're assuming that he hasn't.....

I am also interested in any constructive response as I'd like to build up something nicely balanced. I heard on the grapevine that AMB might be reviewing the gamma - any further news, and will it have a balanced build option?

 

[DaKi][er]

Many DAC IC's output in a balanced fashion, but sum to a single ended output at the end. Find one you like and find a project that uses this IC and modify it to suit

 

[pdupiano]

yeah i search b4 i post.

looks like I'll mod my gamma 1 the wolfson dac should be able to output the signals i need.

 

[XXII]

well you must have missed the whole TPA Buffalo DAC craze

 

[pdupiano]

Well for the most part I've come to realize that TPA is .... out of reach since they're always sold out. Can I simply run the audio signals through a pair of inverters and have the original Left and Right signals as well as an inverted Left and Right? I think there's actually a phase shift when I use an inverter and I'm not sure how to bypass the problem. I really wish I had a scope to just play and mess around with stuff.

 

[glitch39]

buy a zhaolu DAC and a zapfilter II. perfect combo.

 

[No_One411]

Quote:

Originally Posted by glitch39 /img/forum/go_quote.gif buy a zhaolu DAC and a zapfilter II. perfect combo.

The Zapfilter II is about as out of reach as the Twisted Pear Audio modules....Its probably the OP's best bet though...

 

[cobaltmute]

Use an ezDAC and take the output off the board at the point you where you install the Mica Caps. You would then need to do a balanced I/V stage.

 

[pdupiano]

I think the part I'm missing is the "Balanced I/V stage" Cobaltmute, do you have any more info/links that I can look into?

 

[cobaltmute]

I've seen one design in the past, but can't find the link right now. I see if I can dig it up.

 

[pdupiano]

Thanks Cobaltmute.

I have looked into the Zapfilter but and as far as I'm concerned it looks exactly like what I'm looking for, but as others have pointed out its just as rare as all of TPA's stuff. At this point I think I want to make a little add on to the gamma 1 that will take the left and right channels, invert the signal, and buffer the original with a dual opamp where one is arranged as an inverter (gain 1) and the other as non-inverting (gain 1). I still have doubts that this will work because I don't know if the two signals will be out of phase. I've scoured through the current dacs available and it looks like all balanced dacs use a Dac chip that provides a r+/- and a l+/- from the dac itself. If I can get this thing going, I can see the possibilities of a cheap alternative to the zapfilter, where you take an unbalanced output from a dac and turn it into a balanced one.

 

[cobaltmute]

TPA's IVY has a schematic and manual on the web.

 

[pdupiano]

Actually it looks like the IVY only does balanced to balanced not SE to balanced but it can do Balanced to SE.