OPA2107 !!!! WOW!!!

[Andrea]

Quote:

Originally Posted by daveDerek after all your raving about the new Xenos you're not getting it??? you kill me, Andrea.

They're both (0HA-REP & XM3) flying to me.

 

[brospin]

Does anyone know if I can use the OPA2107 in a Spitfire DAC (it comes stock with one OPA2604?

 

[Andrea]

Quote:

Originally Posted by brospin Does anyone know if I can use the OPA2107 in a Spitfire DAC (it comes stock with one OPA2604?

Absolutely & recommended too

 

[Andrea]

Quote:

Originally Posted by Audioexcels How are these chips compared to the 627/637 type or the LT series such as the LT1360/1361? One other...the LM6172 Curious what people think of these ops I have mentioned compared to what you are using. Regards!

For unbuffered amps the OPA627/637 are no good.

Instead the LT1361 I have had a very good experience with. I'll soon enjoy comparing the LT1364 (a little more powerful than the 1361) and the LM6172 to the OPA2107 when the XM3 & the chips arrive.

 

[ozshadow]

Yes, I much prefer it over 2227 and 2132 chips. It sounds far better in an A47 amp than a Cmoy. I can't wait to hear it in a PPAS. I already have smd versions of those and 8620's to compare.

 

[munkong]

OPA627 can run with only 1 batt (9V) ?
is it stable ? any comments for me ?

 

[ppl]

The warnings about the OPA-2107 operation at low supply voltages should be followed. I have used this chip in lots of circuits since it was introduced in the Mid to late 1980's and I have found this OPA to be very unhappy at +/- 5volts the DC offset starts to go quite high below that and it completely stops operating at +/- 4 volts.

Another thing that may be of a concern in a cmoy application is the devices limited output current, However in all my Headphone Amp Applications I buffer the op amp so the drive current is not an issue. I primarily use this as an upgrade for AC operated equipment that uses Dual opamps and the Listener wants a warm somewhat fat sound.

 

[kramer5150]

Quote:

Originally Posted by ppl The warnings about the OPA-2107 operation at low supply voltages should be followed. I have used this chip in lots of circuits since it was introduced in the Mid to late 1980's and I have found this OPA to be very unhappy at +/- 5volts the DC offset starts to go quite high below that and it completely stops operating at +/- 4 volts. Another thing that may be of a concern in a cmoy application is the devices limited output current, However in all my Headphone Amp Applications I buffer the op amp so the drive current is not an issue. I primarily use this as an upgrade for AC operated equipment that uses Dual opamps and the Listener wants a warm somewhat fat sound.

Thanks for the warning... I've modded my govibe to 18V.

Is it safe with the 2107 at 24V? I have an elpac I'd like to use.

????
Garrett

 

[sidewinder]

Quote:

Originally Posted by kramer5150 Is it safe with the 2107 at 24V? I have an elpac I'd like to use.

No, it can only take 18V max.

Quote:

Originally Posted by munkong OPA627 can run with only 1 batt (9V) ? is it stable ? any comments for me ?

It is stable using 9V. Minimum required is about 5V.

 

[ppl]

Sidewinder please read the data sheet very carefully prior to posting, just ahead of the 18 volts max is a + and - so to answer the previous posters question yes 24 volts is great and completely safe as it is well below the 36 volt max. The OPA2107 is quite easy to use and is as quite stable, however as with any op amp stability depends upon layout and Design the use of Premium parts requires great care to get the full benefit out of the device, however also note the OPA2107 works quite well in less than perfect layouts that give problems for alot of other opamps. this makes the OPA2107 quite easy to use for the Novice

 

[sidewinder]

My fault. It's indeed from -18V to +18V.

 

[Andrea]

The OPA2107's short circuit current specification is difficult to read. It is said to be 10 mA minimum, and 40 mA typical. That is? The OPA2134 has a 40 mA short circuit current. Should that suggest that the two chips have around the same linear output current (of 35 mA) ?

 

[kramer5150]

OK thanks!!

Garrett

 

[Pete7]

Tried OPA2107 in the PR II today with UM2's. I've tried it in there using other headphones and wasn't all that impressed. With UM2's, all I can say is WOW!!!
Normally I use OPA627's. 2107 was more detailed, highs were more extended, and the bass was controlled and tight. I've never heard bass in the UM2's controlled or tight for that matter. Might be a good op-amp for the E500's when I get them. Even turning up the variable bass boost, the bass still didn't sound all boomy. Reminds me more of AD797 than OPA627, which I know people often compare it to.

 

[ozshadow]

Yep, its pretty high voltage. I really enjoy this little amp with it running on 27v: http://ozpk.ginnypotter.com/a47_7.jpg The bass is very tight and controlled, and has definition and impact, even for notes played far in the background.

I can't wait to hear it in my PPAS and compare it to the AD8620. I'm using buf634's, so that should be interesting how the sound changes.