[K3cT]

I'm curious to try that AD797 mod but I'm not sure since the thing already sounds so bloody good now.

 

[SpudHarris]

Which mod?

 

[K3cT]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Which mod?

Adding a small capacitor between Pin 6 and 8 for "distortion cancellation", it's in that linked thread in the previous page.

 

[SpudHarris]

Ahh, sorry. Struggling to keep up with recent events etc..... yeah I've got some adapters coming with a place specifically for this. Need to check for capacitor values though. I'll go back and have a look. Good god, imagine the AD797 sounding even better

 

[diditmyself]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Ahh, sorry. Struggling to keep up with recent events etc..... yeah I've got some adapters coming with a place specifically for this. Need to check for capacitor values though. I'll go back and have a look. Good god, imagine the AD797 sounding even better

This is not a mod. It's described in the data sheet. You're supposed to use a 50 pF cap, but I think 47 pF is close enough. If you have a buffer after AD797, a tweak is to connect this cap from the output of the buffer to pin 8.

 

[ROBSCIX]

Quote:

Originally Posted by diditmyself /img/forum/go_quote.gif This is not a mod. It's described in the data sheet. You're supposed to use a 50 pF cap, but I think 47 pF is close enough. If you have a buffer after AD797, a tweak is to connect this cap from the output of the buffer to pin 8.

Let us know what you find.

 

[SpudHarris]

Quote:

Originally Posted by diditmyself /img/forum/go_quote.gif This is not a mod. It's described in the data sheet. You're supposed to use a 50 pF cap, but I think 47 pF is close enough. If you have a buffer after AD797, a tweak is to connect this cap from the output of the buffer to pin 8.

Yeah,, I printed out the 36 pages of Walt Jung Op Amp Aplications for a bit of ''toilet reading'' and picked that up. Not sure I'll bother though as I'm lovin the 797's as are.......

 

[ROBSCIX]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Yeah,, I printed out the 36 pages of Walt Jung Op Amp Aplications for a bit of ''toilet reading'' and picked that up. Not sure I'll bother though as I'm lovin the 797's as are.......

I have stacks of printed PDF's, audio design books...etc. I need to get a PDF reader would save quite a few trees in the long run.

 

[qusp]

limiting the bandwidth of 797 works quite well for stabilty too, since we dont use nearly its capabilities in audio. i'm actually using some AD797 in some super regulators, so i'm poised to love it even more.

 

[K3cT]

Apparently the AD797 can be decompensated too by adding 2 resistors in the datasheet. Very interesting!

 

[Spacehead]

How to make the OPA552 stable in unity gain (virtual ground buffer)? Any example circuits? I tried the circuit in its datasheet but it didn't work.

 

[majkel]

Buy OPA551.

 

[ROBSCIX]

Have you had a chance to test the new OPA164X series Majkel?

 

[ROBSCIX]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Yeah,, I printed out the 36 pages of Walt Jung Op Amp Aplications for a bit of ''toilet reading'' and picked that up. Not sure I'll bother though as I'm lovin the 797's as are.......

Spud, have you tested both the 164X? Meaning single and dual channel version?

 

[SpudHarris]

Only the singles Rob (OPA1641). They are real nice......... especially considering cost.