The Opamp thread

[SpudHarris]

That's the one to start off with really. What sort of level are you at with the whole cmoy/opamp thing?

I've been making these for a while now and still got some boards and a few 2132's left I can let you have to get you started if you like. You can have variable bass (50k pot) or a toggle switch for a set bass boost or just bypass it.

 

[ecclesand]

Nice build there, Nigel.

 

[jhanby]

Well this is going to be my first cmoy and my first electronics project really (although I've had quite a bit of experience with electronics in general before.

I think it may be better for me to use a protoboard, so that I can learn more about the schematic. This project is more for learning to go onto bigger DIY desktop amps really.

Thanks for the offer and the new website (farnell)

 

[SpudHarris]

Quote:

Originally Posted by jhanby /img/forum/go_quote.gif I think it may be better for me to use a protoboard, so that I can learn more about the schematic.

Agreed..........for me? well I'm a lazy ass and still don't know much about even a cmoy circuit

hehe

 

[ROBSCIX]

Quote:

Originally Posted by jhanby /img/forum/go_quote.gif Hi, No i did not know that it was a single channel. What would you recommend instead ? I may be planning on using a protoboard, but may be intrested in those PCBs, you got a link to any more details ? And i'm in Peterborough EDIT : just found this, which looks a bit better ? John

Peterborough? ONT or UK?

 

[SpudHarris]

He's in the UK Rob (see his original post).

 

[ecclesand]

I have now tried 2 x LT1363; 2 x LT1028; and 2 x LT1357 as the line drivers of my DAC-AH. Without a doubt...to my ears...the LT1357 sounds the best surprisingly. The LT1363 sounded mushy. The LT1028 sounded harsh in the upper end. The LT1357 must have some synergy with this DAC...wide and natural soundstage, deep punchy bass, smooth mids, and clear highs. I'm still waiting on the opa627s and LME49710HAs.

 

[SpudHarris]

Quote:

Originally Posted by ecclesand /img/forum/go_quote.gif Nice build there, Nigel.

Thanks Doug!

I must get around to a few more builds, there is a lack of guys building/selling these in the UK. E-bay is ripe for a quality but reasonably priced cmoy for the UK market.

 

[ROBSCIX]

@Spud, that is a nice build for a portable amp. Great stuff!

@Jude, if you like the LME49720HA, I sugegst you test out the LME49710HA as there is a noticable improvement over the dual channel module. This is according to impression reported from quite a few people around here.

 

[ecclesand]

Quote:

Originally Posted by hey jude /img/forum/go_quote.gif That is no synergy matter. It's exactly how the same opamps have sounded for my ears in my extended testing (and my hardware). The LT1363 does sound "mushy", except in a CMOY where it's the best I've heard. The LT1028 (both ACN8 and CS8) does have an aggressive treble, unfortunately. The LT1357 is simply the best opamp of the bunch. I remember how very much better it sounded than a TI NE5534, as well. That's no mystery, though... Jim Williams of Audio Upgrades (very popular guy in other forums - not a trace of him here) has been saying that the LT1357 is the best single opamp with the OPA211 for quite some time. He used to work at Linear Technology, if I recall correctly.

Hey Andrea...I didn't care for the dual LT1357s in another circuit. Although, they were mounted on a 2 to 1 BD adapter. It sounded OK, but not as good as other LTs. I felt the same about the dual version LT1358. They were just very unimpressive at first. Perhaps the Dac-AH is more resolving than the Peridot.

 

[Reima]

I got my TO-99 dual adapters so I put together a dual LME49710HA module. This module just replaced the LME49720HA that I had in my Pimeta V1, I haven't had a chance to do much listening with it as yet but so far I like what I hear.
RC

 

[leeperry]

Quote:

Originally Posted by ecclesand /img/forum/go_quote.gif I didn't care for the dual LT1357s in another circuit. Although, they were mounted on a 2 to 1 BD adapter. It sounded OK, but not as good as other LTs.

1357 sounding better than 1364, hell breaks loose

maybe I'll try the 1358/1057ACN8 on my current board, but they were whiney/resonant as hell on the STX as I/V...anyway, I think I'm gonna try a new burson to replace the 2132P...or possibly give its chance to the 2111KP, it sounded less V-EQ shaped than the 2132P I think

 

[SpudHarris]

Quote:

Originally Posted by leeperry /img/forum/go_quote.gif 1357 sounding better than 1364, hell breaks loose maybe I'll try the 1358/1057ACN8 on my current board, but they were whiney/resonant as hell on the STX as I/V...anyway, I think I'm gonna try a new burson to replace the 2132P...or possibly give its chance to the 2111KP, it sounded less V-EQ shaped than the 2132P I think

I've always rated the 1357's. probably 3-4 on my fave list!

 

[leeperry]

I remember I liked the 1358 as it was my first LT chip, waking up from the 49720HA nightmare....but after a while I found its trebles too digital to my taste, and not involving enough...just dull.

what's annoying is that you can only fit one op-amp in your cmoy apparently? I couldn't live w/ either the 1364 or the 2132P....but mixed together they seem to only show their good sides(1364 for vocals/natural SS, 2132P for wide natural SS/great bass response/magic mids).

ah well, I wish I could stack 4-5 op-amps, like adding a burson behind the 1364+2132P...but as Stash47 said 2*1364+1*burson must be the magic combination

 

[ecclesand]

Quote:

Originally Posted by Reima /img/forum/go_quote.gif I got my TO-99 dual adapters so I put together a dual LME49710HA module. This module just replaced the LME49720HA that I had in my Pimeta V1, I haven't had a chance to do much listening with it as yet but so far I like what I hear. RC

Nice job! Beats the hell out of my ghetto job of bending pins and soldering them to a dual DIP8 adapter.