21 Sep
2010
21 Sep
'10
11:29 p.m.
On 2010 Sep 20, at 9:16 PM, Nick Allen wrote:
Need to find the 14 pin opamp (as I am also a purest
and want it to
be ORIGINAL), found a pair on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll?
ViewItem&item=330471900022&rvr_id=143156802920&crlp=1_263602_263622&UA=
%3F*F%3F&GUID=94213f4c1260a0269d971e47ff8e9d4d&itemid=330471900022%24&f
f4=263602_263622
WAY to expensive, and I only need 1, anyone have one they might be
able to sell me, or able to find a cheaper source?
http://lh6.ggpht.com/_lkddKjPsPFU/TJgv61uSNMI/AAAAAAAABhM/-n0SEds-o5g/
_1020935.JPG
With a blown 709 to replace, you might find this interesting, an
interview with Dave Fullagar, the designer of the 741, following 709
designer Bob Widlar's departure from Fairchild:
http://www.edn.com/article/472246-
Voices_Dave_Fullagar_analog_IC_designer_and_entrepreneur.php
Extract:
My assigned task when I joined Fairchild R&D in 1966 was to design
the successor to the ?A709.
...
However the biggest problems with the 709 were its idiosyncrasies,
not its specifications:
It was tricky to stabilize, there was no short-circuit protection,
and it would latch-up and
self-destruct in nanoseconds.
...
--
If op-amp history is too off-topic for people, there is also some
mention of the development of those nifty Maxim RS232 drivers.