I'm looking for a replacement op amp for the NE531 to complete some
boards on an old design.   I haven't had much luck as it seems to have
been obsoleted around 1999.  The client has a lot of PCBs leftover
from an old run, so a drop-in would be ideal.  Perfect would be a
surplus tube somewhere, but I haven't had much luck.

The design is possibly older than myself, so much of the original
documentation is non-existent.  The part is used in two places, a
unity gain follower and a half wave rectifier.  I assume it was chosen
due to high (35V/usec) slew rate.

The pinout looks the same as the TL070 which seems more common (but
also obsoleted).  Some parts have looked promising, but the offset
null / compensation pins were swapped.

- Power supply is +15V,-15V
- Incoming signal is ~30kHz

Op amps are not my area of expertise, external compensation capacitors
were new to me, so I've been doing a lot of reading up on the details.
 I'm still working out how much of the circuit works.  Any suggestions
would be appreciated.

Thanks,
Alex
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist