Op Amp pinouts was Re: [sdiy] more LM3900 stuff

[harrybissell]

inline....

"JH." wrote:
> 
> I think they are similar to the 4558.
> Just use duals instead of quads. 8-)
> 
> My favorites are:
> TL071 / 072 / 074 where high input impedance is needed

OK, ditto...

> CA3140 / CA3240 where higher input impedance is needed

OK, ditto...
> Discrete transistor circuits or NE5532 or AD275 for "demanding" audio
> circuits,

5532 is pretty demanding of power supply current, and low input
impedance
for best results. Have not tried the AD275... whats it like ???

> TL071 / 072 / 074 or RC4558 for less demanding audio circuits,

The 4558 is an excellent low noise opamp !!!

When I was a newby (yes... newby... thats what we used to call newbys
before
all you newbies showed up on the scene... sometime in the last century
or so :^)

I took apart my Slavedriver guitar interface... and was HORRIFIED to
discover the
4558 (which I foolishly thought was like a 1458, without looking at the
data sheet)... and ripped them out to replace them with some superior
opamp that
surely my employer would have in stock.  WRONG MOVE newby...   I found
that it was
a better part for that application than anything we had, and i could not
find a better one, even for money !!!

Happy ending... I had removed them carefully, and used sockets. Put them
back in
where they remain to this day.

lesson learned...  Engineers specify parts for a reason. Sometimes you
have to decide... was the designer fvcking stupid... or were they so
clever I can't follow
their train of thought. Usually its the latter...

> LM324 / LM358 / uA741 where slow = good (immune to interference)

Another AMEN. 741 can be a GOOD thing. They don't suffer from "phase
reversal" when overdriven, have symmetrical source sink characteristics,
and are almost
indestructible !!!

> OP-07 for slow, low offset applications,

do go on....

> TL080 for tailoring slew rate,

Hmm havent tried that...

> 12BH7 for driving 600Ohm lines with 4:1 transformers  8-) 8-)

Hmmm... isnt that one of those octal deals in the hermetic glass package
???  ;^P

H^) harry