TL074CN upgrade?
tol...@nextfrontier.net
or is it still current?
thanks
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Scott Dorsey
>anyone recommend an upgrade for this chip?
>or is it still current?
>thanks
It's "still current" in that it's still a production item, but then the 741
is still a production item.
There are a lot of op-amps out there, and which one you would pick to replace
a TL074 has a lot to do with the circuit that it's in. In a lot of cases,
especially if it's a low-Z input where you don't have a lot of supply current
to waste, you might want to keep the TL074 in there. If you have a lot of
current available and a higher-Z source, you might want to replace it but
what you replace it with depends on how critical the noise floor on that
stage is, and how much feedback you're putting on it, and how well it is
decoupled.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
carolyn Cameron
OPA4132. For that matter you can replace TL071's with their OPA132, and
replace TL072's with the OPA2132.
There should be no stability problems with the substitutions. The
OPA132-series doesn't get their low distortion by having a ridiculously
high gain bandwidth product, but rather by having low open loop
distortion, so they can easily be substituted in many modern circuits.
Also, be careful not to exceed the supply current rating and watch out
for excess heat buildup--the OPA132-series draws about twice the amount
of supply current than the TL07x-series, and this may make the insides
pretty toasty (use heat-sinks).
By the way, the TL07x-series op-amps are still available.
Enjoy!
Joel Cameron
Dimitrios Bitzenis
Monte P McGuire
Dimitrios Bitzenis <dbit...@hotmail.com> wrote:
>You can use LT1359CN from Linear Technologies but way expensive !
And not as good of a replacement IMHO. This series of LT amps gets
their performance from a high gain bandwidth product, so if you use
the fast versions or if the layout is poor, they can oscillate or have
marginal stability and end up sounding bright and hashy. They're also
bipolar input devices, and the fast ones have a significant amount of
input bias current. Some TL07x circuits require JFET inputs and their
resulting lack of input bias current, so it's not such a simple
substitution.
The OPA132 series is a _lot_ simpler to use and they sound really
really good. The output stage is also very hefty, the voltage noise
is siginificantly lower than traditional BiFETs and they don't cost
all that much.
Best of luck,
Monte McGuire
mcg...@world.std.com
Vince @ Speck
"higher performance" linear IC's. Some IC's, like the TLO series are very
stable, so much so, that sometimes designers don't bother with fancy
circuit layout, decoupling, or the quality of the ICs' complementary
passive components. Not all IC's are this forgiving! Many need careful
PS decoupling, cooling considerations, and are not unity gain stable.
Regards,
Vince
http://www.speck.com