Good Low-noise op amp?

[Michael Rothacher]

I want to build some balanced to unbalanced converters for instrumentation. What's a good low-noise / low distortion op amp to use?

Thanks

Mike

 

[Morello]

Good FET-inpt OP-amps are OPA627 and OPA134 from BurrBrown

Good bipolar OP-amps are OP27/37, AD797

 

[jackinnj]

I want to build some balanced to unbalanced converters for instrumentation. What's a good low-noise / low distortion op amp to use?

For instrumentation applications -- thermcouple, ultrasound, photodiode, strain bridge -- you really want an instrumentation amplifier from Analog Devices, Linear Tech or Burr Brown (TI), Rather than putting the cart in front of the horse, search by application.

Analog has a 72 page guide to Instrument Amps:
http://www.analog.com/UploadedFiles/Associated_Docs/4041017035571242329367appguide.pdf

Some of the Burr Brown instrumentation amps show up in good quantity on EBay -- like the INA101, INA103 -- these are pretty expensive if you purchase through a distributor, however.

 

[Michael Rothacher]

Excellent. Thank you, both.

This will be a signal conditioner for a sound card.