My mainstay op amp in my experimental circuits has always been the CA3130, 
mainly because I acquired a bag-full about 25 years ago.

I like them because of the MOSFET input, single supply capability, and they 
not internally compensated so I can design my own compensation to suit the 
application.

However, I have just used my last one, and understand that they are now 
obsolete.

Please could someone suggest which jelly bean op amp would match the above 
criteria, and be cheap enough for me to buy another bag-full?

Regards, Phil.


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