[sdiy] Wanted: Discontinued Op-amp (alive)

[KA4HJH]

>Is this a verified replacement?  I did a search and found one link where
>someone claims that the following are all the *same chip*...hmmm
>
>TBA231
>uA739
>MC/LM1303 (good to know..had one of those in a drawer and always
>wondered what it was!)
>NTE/ECG725

I have never seen the data sheets but I have two 739's here and they are
clearly NOT the same IC as the 4739. They work fine in their original
circuit but NOT in a circuit that uses the 4739 (which in turn works fine
with an actual 4739).

>>> >Does anyone on list have a few RC4739 or XR4739 Dual op amps they
>>> >could spare for a worthy cause? If so, contact me off list with a
>>> >price. I'm in the market for 5 to 50. Also, if you have a few RC or
>>> >XR4136's, i'd be interested in those, as well.
>>> >
>>> >-spencer

PAiA has been substituting the 5532 for the 4739 for years now. They sell a
special daughterboard that remaps the pins. The 5532 is superior but with
increased current consumption.

-- 

Terry Bowman, KA4HJH
"The Mac Doctor"