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Old 3rd June 2008, 11:07 AM   #1
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Default op-amp supply voltage

i am going to make a simple preamp with opamp such as opa627,what is the optimal supply voltagecan give the best sound quality

many thanks
Arthur
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Old 3rd June 2008, 12:58 PM   #2
Nuuk is offline Nuuk  United Kingdom
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I prefer +/-18v with the OPS627.
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Old 3rd June 2008, 05:43 PM   #3
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if i can only have +- 9v ,what op amps are more suitable?
Thanks in advance.
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Old 3rd June 2008, 06:27 PM   #4
Nuuk is offline Nuuk  United Kingdom
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I can't really comment as I have never used those voltages. I have used the OPA134 down to +/-12v so that may be worth a try!
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Old 3rd June 2008, 07:22 PM   #5
satoru is offline satoru  United States
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Hi,

LME49710 is specified from ±2.5V supply and it is a nice low-distortion OP-AMP. People tends to prefer higher voltage for more dynamic range above the noise floor (which is fixed by the temperature, etc).

Good luck with your project!
Satoru
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Old 4th June 2008, 04:15 PM   #6
cpemma is offline cpemma  United Kingdom
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You may find this list useful, though note the application is headphone amps.
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Old 4th June 2008, 05:35 PM   #7
KP11520 is offline KP11520  United States
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Tangentsoft (see previous post) also sells something you can use for a PS.

http://tangentsoft.net/shop/

Search the whole site. Lots of good info and the 627 gives great results if you design the circuit correctly with optimum voltage. Do your research!

Regards//Keith
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