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4558 and TL072 question
4558 and TL072 question
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Old 13th January 2005, 07:40 PM   #11
nuvistor is offline nuvistor  United States
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OP270 is dual OPA with 2 gain stages, second stage is folded-cascode, similar to OP27 so won't drive 600 ohms to 10V. AD827 is dual version of AD817, single-stage folded-cascode, higher voltage noise than 5532.
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Old 14th January 2005, 03:13 AM   #12
BrianL is offline BrianL  United States
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4558 and TL072 question
Chris,

Why would anyone PAY for op-amps? I haven't purchased an
op-amp in since the early '70s.

I'm fully aware of what audio signals go through. That's no
reason for poor design on the part of a DIY'er.

And no, I'm not into exotic op-amps for their own sake. But
surely anyone doing a DIY mod can do better than TL072
or 4558, even for less than $10, even less than $2
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Old 14th January 2005, 05:51 AM   #13
sivan_and is offline sivan_and  India
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Quote:
I'm not into exotic op-amps for their own sake. But
?
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Old 15th January 2005, 02:46 AM   #14
anatech is offline anatech  Canada
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4558 and TL072 question
Hi BrianL,
Do you steal them??? Besides, this is an upgrade on something that uses 4558's. Let's not get too pie in the sky here.

I know, we'll replace every op amp with a discrete circuit!

-Chris
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Old 15th January 2005, 04:59 AM   #15
Upupa Epops is offline Upupa Epops  Czech Republic
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To Anatech : Chris, correctly designed delay or echo with BB give better sonic results than digital ones .
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Old 15th January 2005, 05:55 PM   #16
anatech is offline anatech  Canada
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4558 and TL072 question
Hi Upupa Epops,
I agree with you. I was commenting really on equipment in use in different studios in the eighties & nineties, maybe still.
Anyhow, I was trying to get the advice back on track to the original post. Inject a little realism. Many updates are valid considering the situation, even though the upgrade can be taken further. It isn't a perfect world and never will be.
-Chris
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Old 19th November 2005, 04:19 PM   #17
kexik is offline kexik  Slovakia
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strongly depends on application. 4558 is slow, but quite low noise, especially at low input impedances (works satisfactory as mic preamp, for instance, or playback head preamp). tl072 is faster and better suited for higher input/output voltages. good as driver for line amp or headphone amp with a pair of comp. transistors. these are just examples. they are 100% compatible in terms of pin layout, supply requirements, etc... anyway, guys there are true, they are both pretty poor stuff, if real high end is concerned.
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Old 19th November 2005, 04:46 PM   #18
anatech is offline anatech  Canada
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4558 and TL072 question
Hi kexik,
Yes, using the correct family of parts, in this case bipolar or J fet inputs. By looking at the application you are engaging in cost accounting by not choosing a part that is not overboard. That's the balance that should be achived. Building to a price can skew this.

-Chris
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Old 3rd April 2006, 05:33 AM   #19
-_nando-_ is offline -_nando-_  Brazil
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TL072 sounds MUUUUUUUUUCHHH better than 4558...

4558 is AWFUL... 072 is "ok"...
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Old 3rd April 2006, 07:26 AM   #20
lndm is offline lndm  Australia
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I think the 072 gives a straight, reliable low noise performance whereas the 5532 is more 'out there' and musical.

I see a lot of 4558's as g=1 buffers at the output of cd players etc. Can you replace them with a link or capacitor instead?
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