Re: OP37

Thaddeus,

  The title is OP37, but your schematic shows OP27.  The pc board photo looks like an OP37.

You are onlly running a noise gain 3-4 so you really need an OP27.  The OP37 should oscillate.

If your board is not oscillating with an OP37, you got lucky....

http://www.edn.com/electronics-blogs/analog-ic-startup/4389788/Decompensated-Operational-Amplifiers---In-Memoriam-

Harry