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Old 15th February 2004, 11:58 AM   #1
Alvin is offline Alvin  Hong Kong
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Default Good Dual Opamp >+/-15V suggestion

I would like to modified my Denon A1SE 7.1 channel AV amp.
I find 4 AD1853 DAC, and 8 OPA2134 and 8 LM833 in the digital board. The opamp are measured in +/-15V (total 30V) operation.

I want to use AD8620 but it +/-13V seems cannot meet the voltage requirement.

I want like to ask which opamp is the another best alternatives?
AD8512
AD826
OPA2132
OPA2111

Please suggest. Thanks!
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Old 15th February 2004, 01:43 PM   #2
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I have run my QRV-04 headphone amp for nearly a year now at +- 15 volts with AD8610. Nothing to recommend for a commercial product but for home use and with stabilized voltage I think it's OK.

AD8610/20 is really, really good!
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Old 15th February 2004, 03:45 PM   #3
maylar is offline maylar  United States
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For dual units I'm personally fond of the Linear Technologies LT1013.
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Old 15th February 2004, 05:02 PM   #4
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Hmmm I dont know where abouts the 2134's are used in the Denon, but they are one of the best out there anyway. Obviously you can do better, like peranders says the AD8610/20's are v good. I use these for the tweeter leg in my active xover and are very good. OPA627's are also good they do the mid leg in my active. Runs over to mic preamp...... looks at chip in it, aha yes the AD797's are also good. M levinson uses them in their amps. 797's are also meant to be good in I/V stages after the DAC chip in DAC's, if they are stable and do not oscillate that is!

Good luck improving the sound, however 2134's are not bad at all, so any gains you will get mite only be quite small, unless there is something i am missing! I use 2134's in my DAC's IV and the bass leg on the old active.
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Old 16th February 2004, 12:12 AM   #5
Alvin is offline Alvin  Hong Kong
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Default AD8620 really suitable for +/-15V operation?

OPA2134 seems to be a quite good dual opamp from others' comments. I would like to replace the cheap LM833 first.

I would like to know if the excellent AD8620 can really work in exact +/-15V operation? Anyone further has such experience?

What will be the good partner of opamp with OPA2134?
Thanks!
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Old 16th February 2004, 09:25 PM   #6
Gunders is offline Gunders  Norway
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May OPA604 be an alternative?
OPA604 can take supply voltages up to +/-24V.
The SR is 25V/uS, GBW=20MHz, noise = 10nV/sqrt(Hz), CMRR(Min)=80dB, offset(maks)=5mV and they are available as doubles.

For more informations:
http://focus.ti.com/docs/prod/folders/print/opa604.html

And not to forget... they are rater cheap too.
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Old 17th February 2004, 12:08 AM   #7
mlloyd1 is offline mlloyd1  United States
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Default A little advice (was Re: AD8620 really suitable for +/-15V operation?)

The folks who design, build and test the device (Analog Devices) say don't use more than +/- 13V (see the data sheet)!!!

That's pretty clear to me; just don't do it unless you will live with the consequences.

mlloyd1

Quote:
Originally posted by Alvin
.... I would like to know if the excellent AD8620 can really work in exact +/-15V operation? ....
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Old 17th February 2004, 07:46 AM   #8
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Default Re: AD8620 really suitable for +/-15V operation?

Quote:
Originally posted by Alvin
OPA2134 seems to be a quite good dual opamp from others' comments. I would like to replace the cheap LM833 first.

I would like to know if the excellent AD8620 can really work in exact +/-15V operation? Anyone further has such experience?

What will be the good partner of opamp with OPA2134?
Thanks!
See my post above!

The maximum rating is 27,6 volts in total so everything above is a risk but if you are prepared to take it, go for it. If you are unsure, just put voltage to the IC when they are not in the circuit and test them for a week or so. If they last a week the will probably last longer also. Don't forget to connect them so they work in linear mode, voltage follower maybe.
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Old 17th February 2004, 09:40 AM   #9
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I would be very carefull, and not take the risk. Even if they still "work" after a week, the performance, noise, gain etc may be heavily degraded, and you amp will perform much below potential. Just set the supply to +/- 13VDC, what's the problem with that?

Jan Didden
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Old 17th February 2004, 09:45 AM   #10
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If I would really plan to use AD8610/20 I would never use more than +- 13 volts on purpose but in my case I was just too lazy to change resistors at the regulators.
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