[slowpogo]

Quote:

Originally Posted by JamesL /img/forum/go_quote.gif Sure, why not. The value of the capacitor will define the -3db roll off on the hpf. I personally think the 1uF polyester is good enough for use with >50k impedance pots, while the electrolytes offer more flexibility. The 47uF will probably be satisfactory with some higher impedance headphones as well(~300ohm)

I threw those 47uf Black Gates in, and they sound fantastic. I hear no discernible difference in the bass, at least not for the worse.

 

[tucsonmike]

So, previously i thought i had something wrong with my y1/y2.
Voltages were low while using 24/25 for power.

USB power works great.

I put a USB-mini connector on my 24/25 and low and behold, i'm only getting 3v into the gamma. This corresponds to my measurements and symptoms while using the 1.3mm jack.

I show 5.02v coming out of the 24/25, but when its connected, it drops to 3v.

Any ideas?

Thanks

 

[MisterX]

Quote:

Any ideas?

Do you have pictures of the Q24 and Q25?

 

[MisterX]

Quote:

Originally Posted by slowpogo /img/forum/go_quote.gif I threw those 47uf Black Gates in, and they sound fantastic. I hear no discernible difference in the bass, at least not for the worse.

Where did you get the idea you would?

Did you try it without the film "bypass" caps yet?

 

[slowpogo]

Because the size of the caps affects the corner frequency...sometimes changing it can be detrimental, I thought.

Haven't tried it without the bypass caps - have you? Is it worthwhile?

 

[K3cT]

Quote:

Originally Posted by JamesL /img/forum/go_quote.gif Sure, why not. The value of the capacitor will define the -3db roll off on the hpf. I personally think the 1uF polyester is good enough for use with >50k impedance pots, while the electrolytes offer more flexibility. The 47uF will probably be satisfactory with some higher impedance headphones as well(~300ohm)

Hmm... this is interesting. Are you saying that the 47uF choice is more suitable for higher impedance cans compared to the default 22uF?

 

[JamesL]

Quote:

Originally Posted by K3cT /img/forum/go_quote.gif Hmm... this is interesting. Are you saying that the 47uF choice is more suitable for higher impedance cans compared to the default 22uF?

I said they'd be satisfactory with higher impedance cans when they are being driven directly out of the DAC.
I think amb's default recommendation of 470uF KW's are generally better suited for driving headphones directly out of the DAC though.

 

[thoppa]

Quote:

Originally Posted by slowpogo /img/forum/go_quote.gif Because the size of the caps affects the corner frequency...sometimes changing it can be detrimental, I thought.

You could go down to about 4.7uF and not notice any change. 47uF would be okay for 300ohm cans and 470uF for 32 ohm cans.

Quote:

Originally Posted by slowpogo /img/forum/go_quote.gif I haven't tried it without the bypass caps - have you? Is it worthwhile?

If you mean coupling caps, it's a very bad idea. The dc offset will cause a large voltage and current to short through the drivers and pop them. Bye bye headphones. I'm sure you knew this.

If you mean to keep the coupling caps and not use the additional bypass, then this would result in the loss of some detail and a slightly rougher top end. How much worse would depend on the quality of the electrolytics - BG NX Hi-Q are great so it'd only be a small difference.

I think MrX is having an evil day....

 

[MisterX]

Are you done editing yet?

 

[thoppa]

haha...yeah...I posted w/o reading the posts above....it was only six or seven edits....

 

[kunalraiker]

I PMed, he didn't get back after I asked what was the difference between gamma 1 and gamma 2.

 

[amb]

Quote:

Originally Posted by kunalraiker /img/forum/go_quote.gif I PMed, he didn't get back after I asked what was the difference between gamma 1 and gamma 2.

You could read the websites yourself:
The γ1 modular miniature DAC
The γ2 compact high performance DAC

 

[thoppa]

Hi Ti,

Can I ask you about the y1 ? The CS8416 datasheet suggests this
RFLT CFLT CRIP
23kΩ 22nF 1nF

On the y1 the components are C18D, C19D and R4;
3kΩ 33nF 1nF

So I'm curious about the filter change from the one given in the datasheet....and what would be the effect on jitter of changing rflt and cflt ?

Thanks.

 

[kunalraiker]

Quote:

Originally Posted by amb /img/forum/go_quote.gif You could read the websites yourself: The γ1 modular miniature DAC The γ2 compact high performance DAC

I was asking for a build, with major differences and price variations.

 

[Nebby]

Quote:

Originally Posted by kunalraiker /img/forum/go_quote.gif I was asking for a build, with major differences and price variations.

I might be reading what you wrote wrongly, but AMB doesn't sell builds. As for the differences and price variations, you can deduce that from the BOM's and interestingly enough, the price variations really depend on what you want so it really depends on you