[Pluto2]

sorry guys, earlier when I said about the recommendation on LM49710 from a gentleman in the forum, which should be sounding close to an 'opa-moon', but not earth ....as I recall, we compared the metal can LM4562 along with earth and moon......

 

[LingLing1337]

Quote:

Originally Posted by ROBSCIX /img/forum/go_quote.gif Yes, but check the voltages in your units. You say 12 volts... does that mean +/- 12 volts? 12 volts total -so +/-6 volts? You will need to verify this voltage an what it actually means.

My wallwart is rated at 12v.

 

[Filburt]

.

 

[leeperry]

Quote:

Originally Posted by LingLing1337 /img/forum/go_quote.gif My wallwart is rated at 12v.

measure it, it's prolly outputtting 15V or so.

and ideally measure it on the PCB under load while the DAC is running

my previous soundcard had a 9V rated adapter, that was actually outputting 13V idle and 11V under load.

Quote:

National would like to thank you very much for your sample order for the LME49722MA.

 

[SpudHarris]

Quote:

Originally Posted by leeperry /img/forum/go_quote.gif

Oh dear, if only they knew hehe

 

[leeperry]

I'm having wet dreams about an improved 49720NA w/ even lower THD at this point

I demand a LME49724 w/ 0.00001% THD

and the more it goes, the more I think that the 49720NA shows you the bass as it is on the record....some amps will compress/increase its response, but it's not necessarily more balanced/accurate to the source material IMHO

 

[LingLing1337]

Quote:

Originally Posted by Filburt /img/forum/go_quote.gif Dovresti trovare un'altra passatempo, Andrea. Non è sano continuare in questo modo

Let me take a stab here-
You should find another pastime, Andrea. It's not sane to continue in this manner.

Italian, right?
Pluto2, right?

 

[zoiberg]

Quote:

Originally Posted by LingLing1337 /img/forum/go_quote.gif I only have the THS4032. By the way, I would definitely like something colder than the 5532. But warmth is a quality that I like. EDIT: To the poster who said that the HDAMs might not be suitable for a 12v application, the Audio-GD web site lists ±9 TO ±25V as the proper range for everything but the Sun V2, which I'm not so interested in.

±9 is 18v so 12v is not enough

 

[ROBSCIX]

Quote:

Originally Posted by zoiberg /img/forum/go_quote.gif ±9 is 18v so 12v is not enough

It is impossible to know exactly how the power is utilized in the circuit from the input voltage. You can have a 12V input and have many different voltage swings for the amplifier section, including +/- 12 V. Which is more then enough power for the discrete opamps. It is hard to know exactly what is being supplied to the opamp without measuring it directly.


@LingLing1337
Do you have any type of manual or spec sheet which would outline the voltage swings for this opamp in the circuit?
Aside from measuring the opamps directly you could contact the company that makes the unit and ask them what the + and - supply voltages are for the 5532 in this design.

 

[LingLing1337]

Quote:

Originally Posted by ROBSCIX /img/forum/go_quote.gif @LingLing1337 Do you have any type of manual or spec sheet which would outline the voltage swings for this opamp in the circuit? Aside from measuring the opamps directly you could contact the company that makes the unit and ask them what the + and - supply voltages are for the 5532 in this design.

No, you see, the DAC is a, erm... Beresford. So no spec sheets. I could try contacting Beresford NA and see if they know. I'll let you know if I find out. Jeff from Beresford NA, when I previously asked him about discretes, said that the unit they tried worked very well.

 

[ROBSCIX]

OK, wasn't sure about that. Contact the company and ask them about the supply voltages for the 5532 opamp.

 

[leeperry]

ok, even the pros recommend the 49722 : rme adi-8 qs op-amps [photos] - Gearslutz.com

 

[Pricklely Peete]

Ling if you have a DMM just measure the V across the + pin (8 Vcc) and - pin (4 or gnd) of the opamp while it's up and running. Look at the data sheet to find the correct pins to make sure.... http://www.datasheetcatalog.org/data...ild/NE5532.pdf

Anyway this will give you a fairly close idea of the + - V running through the stage. I'm assuming you know how to use a digital multi meter so if you have not used one read up on how to use one properly. Plenty of good stuff from google and you tube in this regard.


Peete.

 

[LingLing1337]

Quote:

Originally Posted by Pricklely Peete /img/forum/go_quote.gif Ling if you have a DMM just measure the V across the + pin (8 Vcc) and - pin (4 or gnd) of the opamp while it's up and running. Look at the data sheet to find the correct pins to make sure.... http://www.datasheetcatalog.org/data...ild/NE5532.pdf Anyway this will give you a fairly close idea of the + - V running through the stage. I'm assuming you know how to use a digital multi meter so if you have not used one read up on how to use one properly. Plenty of good stuff from google and you tube in this regard. Peete.

Thanks, I'll see if I can borrow a DMM from someone.

 

[leeperry]

Quote:

Originally Posted by dead can dance /img/forum/go_quote.gif This morning I received new LME49720NA samples (in a different looking DIP package from that of my old LME49710NA, BTW)

"new"? "different" ? you're looking for the best op-amp and you call the 49720NA "new"

this chip kicks butt!

are you saying that the 49722MA is not as good as the 49720NA? I still wanna try it anyway

some photos of what you call "new package" would be much appreciated

so I shouldn't bother w/ LT1358/1355/1364/1469 etc etc??