Ad8620

[roibm]

Hi 🙂

I read that the voltage for the AD8620 is +-5 to +-13V, but I would like to use it for replacing some opamps which work with +-15V
Do you think I will run into problems with this? Will it blow?

Do you have any recommandation for a good dual opamp?

Any other idea?

Thanks

 

[mandat]

I think that OPA2604 fulfils your expectation. Look at Analog Devices home page for data & application notes
http://www.analog.com

 

[mandat]

erratum
focus.ti.com/docs/prod/folders/print/opa2604.html

 

[peranders]

I have used AD8610 in my QRV-04 headphone amp for a year now at +- 15 volts and it still works. I'll think it will work to 94.36% certainty.

My opinion about AD8610, 8620 is

 

[roibm]

pop peranders: my opinion about them is "hit me baby one more time!"
I think I will try them, and if it smokes, that's life 😉

pop mandat: OPA2604 is something I never tried. Any idea how it compares to the AD8620?

push me: thanks for your feedback 🙂

 

[mandat]

I have used OPA604 as a driver followed by four pairs of 2SC3944/2SA1535 transistors working in my A class headphone amp. It sounds really great. Due to the large output current OPA604 works very efficiently in output stages. When you need less efficient op-amp try OPA132. Both op-amps are similar in terms of the sonic quality.
Some information about sonic quality of the most popular op-amps you find below.
http://tangentsoft.net/audio/opamps.html

 

[roibm]

great link... thank you very much 🙂

I will use them just after the DAC, so I don't know if your case is the same with mine.
What do you think? 😕

 

[hjelm]

Krishu here at diyaudio thinks the 8620 is superiour to the 2604 in a Pioneer CD player he modified.

See his comments on his webpage, look for the CD modifications.

Krishu

 

[mandat]

A kind of op-amp used is determined by an application. In The First MkII, which is a DIY DAC, in the output stages (after DAC unit which comes from Crystal) OPA637 and BUF634 op-amps are used and good sound was obtained.

 

[roibm]

I had some 2604 to play with, and compared them to OPA2132P in +-15V environment.
I like OPA2132P better. More details... Maybe this has something to do with the high gain for the OPA2132P.

Anyone experienced something similar?

 

[roibm]

Ok people... The AD8620 is inside.
It sounds amazing compared to what was there before. I really have no words to compare it. It's brilliant!

As I have some AD8066 around I did a small test, A/B/A/B

At first I tried with AD8066, it sounds very good as well, just that I like AD8620 better. 8620 may not have the dynamics of the 8066, but sound more natural, closer to reality I would say.

Both of them were used with +/- 15V, which, especially for the 8066 is quite a bit over the specs(+/- 12V) so this might have influenced the result, don't really know it.

What I liked about both of them is that they are really silent. Dead silent, no noise. Point.

Another remark: the 8066 got quite hot while the 8620 is hardly warm so I think I am on the safe side of the road with it(it is rated at max -40 to 125C).

greetings to all