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Old 13th April 2015, 06:22 AM   #21
rsavas is offline rsavas  Canada
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i will follow along to see what you guys decide, see what I can add.
i should throw out there that others have expressed that they prefer the cirrus cs3318 vol control over pga2311. Some have reported pga2311 latch up. i have no experience with that problem.
i posted my pre-amp design in the other thread, so no need to post here again.
Slewmaster - CFA vs. VFA "Rumble"
Quote:
I see you settled for the 1794A , Jeff wants the mobile 5102 ...
well that was choice back then, not sure if I'd chose it now, but there are good reasons to stick with TI parts.
I usually do not design nor recommend to design something new with a part that has a "NRND" status!! unless ther is absolutely no other option.
LME49600 looks to be a nice part to use as well for a headphone buffer. does anyone find a need for a separate vol for the headphone amp/buffer vs the main pre o/p?
my idea for my pre-amp was all one pcb, no or minimal wires. once your start adding chinese pcb assemblies to the equation I lose interest really fast.
so lets see what feature sets everyone can agree upon.

Last edited by rsavas; 13th April 2015 at 06:36 AM.
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Old 13th April 2015, 06:22 AM   #22
didiet78 is online now didiet78  Indonesia
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Look DS1882 too. PGA231x have internal OP-Amp, DS1882 need buffer
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Old 13th April 2015, 06:29 AM   #23
ostripper is offline ostripper  United States
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Quote:
Originally Posted by rsavas View Post
i will follow along to see what you guys decide, see what I can add.
i should throw out there that others have expressed that they prefer the cirrus cs3318 vol control over pga2311. Some have reported pga2311 latch up. i have no experience with that problem.
i posted my pre-amp design in the other thread, so no need to post here again.
Slewmaster - CFA vs. VFA "Rumble"

well that was choice back then, not sure if I'd chose it now, but there are good reasons to stick with TI parts.
LME49600 looks to be a nice part to use as well for a headphone buffer. does anyone find a need for a separate vol for the headphone amp/buffer vs the main pre o/p?
I could ask the moderators to move that post here. They were most gracious
to rename my thread title screw-up.

I'll look at the cs3318 , and who listens to the headphones / main system
at the same time ?

OS
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Last edited by ostripper; 13th April 2015 at 06:42 AM.
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Old 13th April 2015, 06:39 AM   #24
rsavas is offline rsavas  Canada
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Quote:
I'll look at the cs3318 , and who listens to the headphones / main system
at the same time ?
I guess it is more important if you have a mixer and want to monitor your other channels, DJ mode
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Old 13th April 2015, 06:43 AM   #25
rsavas is offline rsavas  Canada
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a really cheap solution is a maxim max9723, i used the now obsolete max9729 in my portable, it works really well but might be too much low-fi for the purists the specs and performance say differently.
Quote:
I could as the moderators to move that post here. They were most gracious to rename my thread title screw-up.
sure, good idea or i can just re-post it again that is if you think it is of use.
could even consider max14778 as cost effective analog mux, another low-fi solution
okay pcm5102a is the replacement, i will take a look at it tomorrow.

Last edited by rsavas; 13th April 2015 at 06:58 AM.
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Old 13th April 2015, 07:02 AM   #26
ostripper is offline ostripper  United States
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Quote:
Originally Posted by rsavas View Post
a really cheap solution is a maxim max9723, i used the now obsolete max9729 in my portable, it works really well but might be too much low-fi for the purists the specs and performance say differently.

sure, good idea or i can just re-post it again that is if you think it is of use.
could even consider max14778 as cost effective analog mux, another low-fi solution
Nope , a OPAxxxx buffered by the 49600. Only the best !

That combo "blows" the blowtorch !

I looked over your DAC. I (we) only need coax/toslink , and maybe usb.
Don't need 8 (maybe 2) ... to switch between digital sources.

I also notice some novel ways you embellished the power supply using
two LM317's in series to get better performance.

PS- you won't see no Chinese integration here ... all "in-house".

OS
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Old 13th April 2015, 07:21 AM   #27
ostripper is offline ostripper  United States
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I saw the max14778 ,
mini versions of Jeff's SS relays could "smoke" the MAX.

Cross talk between 4 of jeffs would be dependent on the layout ,
The on resistance would be milliohms .

Better yet , Vishay and toshiba have "photo relays" , low Rdson
led opto relays in smd -
Vishay - Solid-State Relays
http://www.vishay.com/docs/81646/vo14642a.pdf

OS
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Old 13th April 2015, 11:47 AM   #28
jwilhelm is offline jwilhelm  Canada
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I'm down for whatever DAC you think will work. I just prefer to use something easily available to everyone. I have my doubts there will be an audible difference in any of them. PCM1794A looks neat with the output buffer. They aren't terribly expensive so the dual mono option might be worth looking at too if you want to go for the ultimate specs. It will depend more in the implementation than parts selected.

I've seen SS signal relays somewhere. I'll do some digging and see if I can find them.

Last edited by jwilhelm; 13th April 2015 at 12:07 PM.
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Old 13th April 2015, 12:20 PM   #29
jwilhelm is offline jwilhelm  Canada
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Are SS relays going to work here? They feed signal through the safety diodes in the mosfet. Isn't that going to resemble crossover distortion in the signal?
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Old 13th April 2015, 04:26 PM   #30
Esperado is offline Esperado  France
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Quote:
Originally Posted by ostripper View Post
1795/6 have the attenuator built in ,no pga2311 needed !
It is digital attenuation. It reduce the number of available bits.
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