The Opamp thread

[ROBSCIX]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Hi-C is just another trick with a 220ohm resistor between pins 1 & 4. It is one of those tweaks that costs next to nothing but has quite a large effect on SQ. Only problem with portable amps though is running Buf's in Hi-C runs the batteries down quicker. I posted some pics earlier, give it a go you'll be amazed what a difference it makes.

Ah yes. When you linked to that pic I remember the conversation now.
Thanks for the information, do you have any other mods you would like to mention?

 

[diditmyself]

Quote:

Originally Posted by 12Bass /img/forum/go_quote.gif I'm a bit concerned about the practice, however, as a number of my circuits are DC coupled, and I suspect that adding bias may produce DC offset at the output.

DC-offset isn't affected.

 

[dlb0089]

anybody here have an essence stx sound card? i was wondering what op amp configurations u guys like. i have been using stock LM4562NA buffer, as well as LM4562NA's in I/V until today i put my stock 2114D's back in due to a aggravating lack of bass with the LM4562NA's/ so i guess what i'm looking for is suggestions on something similar to the 2114D thats several rungs up the quality/clarity ladder. and if i could do better than stock buffer as well.

my speakers are audioengine a5's. and headphones are markl modded denon d2000's

thanks!


EDIT: ive seen quite a few people on here that like the earth/moon/sun opamps. would that be a good direction to head in or could i do better?

 

[leeperry]

ok I've replaced the 2132P by the 827....it's very good so far! clearer trebles, still very good low end bass.

I think I got bored of the 2132 sound...ah

but the forthcoming Moon/Earth will ditch it anyway

 

[12Bass]

Maybe take some time to listen throughout the frequency range. What I noticed after extended listening to the OPA827s was a warm, yet clear and fluid, midrange.... sort of subtle, but musical, IMO.

 

[leeperry]

I've got a bunch of very well recorded classical tracks from Brahms...the kind you'd hear in the Looney Tunes cartoons, w/ Bugs Bunny doing ice skating

I loved how it sounded tubey on the 2132, the violins had a very emotional sound...but as majkel said about the OPA Moon, tubey has its limits

it sounds good for a while, then you get bored of always hearing the sound so much "colored".

the same Brahms tracks on the OPA827 sound more "live"(the 1364 turns everything it touches into solid gold), and less colored...clearer, indeed

triangles seem even farther, indeed the SS is very wide and imaging is great...this is a solid chip so far!

 

[SpudHarris]

Seems as though we are pretty much all agreed, the OPA827 is indeed a fine Opamp. I only ordered 2 at the time so must get another few to try elsewhere.

 

[leeperry]

the upper spectrum is definitely less distorted and clearer/more detailed than on the 2132...but more fatiguing as well, OTOH the low end bass is still very much there but less bloated. imaging is great!

 

[ROBSCIX]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif Seems as though we are pretty much all agreed, the OPA827 is indeed a fine Opamp. I only ordered 2 at the time so must get another few to try elsewhere.

Yes for sure, they seem to have great sound in all our different circuit and applications. I am building 5 dual SOIC8 to DIP8 modules for use in my circuits.

 

[SpudHarris]

OK, I'm putting an order in for some more 827's. Can you guys recommend any other BB chips I should stick on my list?? BTW the TI site is sloooooooooow tonight taking forever for a single page to load. Already have 2107 - 132 - 2132/4 - 627/37 - 228.

 

[ROBSCIX]

How about OPA2227's they are great for bass. You seem to have a good list of BB's already.

 

[12Bass]

Quote:

Originally Posted by SpudHarris /img/forum/go_quote.gif OK, I'm putting an order in for some more 827's. Can you guys recommend any other BB chips I should stick on my list?? BTW the TI site is sloooooooooow tonight taking forever for a single page to load. Already have 2107 - 132 - 2132/4 - 627/37 - 228.

OPA1611/12, OPA211/2211A, OPA365/2365 for low voltage, and OPA2827 if/when it becomes available.

 

[ROBSCIX]

Sure the new 161X series is decent also..they were talked about awhile back.

 

[LuciferX]

Quote:

Originally Posted by leeperry /img/forum/go_quote.gif the upper spectrum is definitely less distorted and clearer/more detailed than on the 2132...but more fatiguing as well, OTOH the low end bass is still very much there but less bloated. imaging is great!

Hahha you found a 2132 substitute, but i need a 1364 one !

 

[SpudHarris]

Quote:

Originally Posted by 12Bass /img/forum/go_quote.gif OPA1611/12, OPA211/2211A, OPA365/2365 for low voltage, and OPA2827 if/when it becomes available.

Thanks, yeah I got the 1611's and 211's. I will try 365's though. Unfortunately TI are asking awkward questions about me ordering more 827's (already had 2 off them) so I'm stumped.