ultra low noise alternative

  • Thread starter .rhavin grobert
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.rhavin grobert

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could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

TIA, .rhavin:)
 
".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?
Click to expand...
Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham
 
GregS wrote:

I don't know why, but I was assuming audio applications.
Click to expand...
That's what the TL07x series was designed for after all.

Graham
 
GregS wrote:

One big problem with the internet, unlike books, data disapears if
its not current.
Click to expand...
Keep those good books ! ;~)

Graham
 
GregS wrote:

Eeyore wrote:
GregS wrote:

I don't know why, but I was assuming audio applications.

That's what the TL07x series was designed for after all.

I have seen the TLO7x series in many applications.
Click to expand...
Oh yes, they're very versatile and not especially expensive, so well adaptable to mnay circuits,
however that WAS their intended primary market.


For a long time I was bent on getting a TLO75 replacement. I guess
I got over it.
Click to expand...
BTW, it's TL zero seven (five), not Oh (the letter) seven (five). Just being pedantic ! ;~)

Graham
 
On 6 Aug., 15:29, zekfr...@zekfrivolous.com (GregS) wrote:
In article <g7c8q0$5n...@usenet01.srv.cis.pitt.edu>, zekfr...@zekfrivolous.com (GregS) wrote:
In article <4898CBEA.CB074...@hotmail.com>, Eeyore
rabbitsfriendsandrelati...@hotmail.com> wrote:

".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham

I would think it depends on the circuit whether a bipolar would work. OPA4134
is a good bifet,
but you just can't expect it to work if you don't know the circuit. Power
supply requirments
are essential. Then there's the LME49740.

greg

I don't know why, but I was assuming audio applications. There are all kinds
of applications that need to be fit into the mix. Is this for instrumentation
and what is the circuit ?

greg
Click to expand...
it for an trace elliot bass amp. see circuit here:
http://tinyurl.com/5cyfcp
except ic1, all ops are TL074. i already replaced ic1 with an OPA 2134
(excellent result) but still have some great humming even when nothing
is connected to the input and mute is pressed. it's definitivle the
main board, not the AHA.
so i wanted to replace all those cheap noisy TL074 with the OPA 4134 -
unfortunately, the PA series (DIP14) is dead;-)
 
".rhavin grobert" wrote:

Eeyore wrote:
".rhavin grobert" wrote:
zekfr...@zekfrivolous.com (GregS) wrote:
zekfr...@zekfrivolous.com (GregS) wrote:
Eeyore wrote:

".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham

I would think it depends on the circuit whether a bipolar would work. OPA4134
is a good bifet,
but you just can't expect it to work if you don't know the circuit. Power
supply requirments
are essential. Then there's the LME49740.

greg

I don't know why, but I was assuming audio applications. There are all kinds
of applications that need to be fit into the mix. Is this for instrumentation
and what is the circuit ?

it for an trace elliot bass amp. see circuit here:
http://tinyurl.com/5cyfcp
except ic1, all ops are TL074. i already replaced ic1 with an OPA 2134
(excellent result) but still have some great humming even when nothing
is connected to the input and mute is pressed. it's definitivle the
main board, not the AHA.
so i wanted to replace all those cheap noisy TL074 with the OPA 4134 -
unfortunately, the PA series (DIP14) is dead;-)

Changing op-amps won't affect humming one tiny bit. You have some other problem. > Could be all sorts

of things. Take it to a tech.

Graham

i am the tech! ;-) the humming is my 2nd problem, i first have to
solve the noise, and as the TL074 are pretty good noise generators, i
want to change them first to have a "clean hum" to start look for and
as the OPA 4134 is dead, i was looking for some other alternative.
Click to expand...
Must be a pretty cruddy circuit if TL074s are noisy in a guitar amp !

I guess you're going to be looking at a TI/BB or AD device but I'm not up to date on low noise fet input
devices, I tend to use bipolar myself.

I'll tell you one thing though. Modern TL0's may be a fraction quieter than old ones. I know the
TL081/2/4 spec changed.

You might want to post in sci.electronics.design. Lots of people are well up on their devices there.

Graham
 
On 7 Aug., 14:19, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:
".rhavin grobert" wrote:
zekfr...@zekfrivolous.com (GregS) wrote:
zekfr...@zekfrivolous.com (GregS) wrote:
Eeyore wrote:

".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham

I would think it depends on the circuit whether a bipolar would work. OPA4134
is a good bifet,
but you just can't expect it to work if you don't know the circuit. Power
supply requirments
are essential. Then there's the LME49740.

greg

I don't know why, but I was assuming audio applications. There are all kinds
of applications that need to be fit into the mix. Is this for instrumentation
and what is the circuit ?

it for an trace elliot bass amp. see circuit here:
http://tinyurl.com/5cyfcp
except ic1, all ops are TL074. i already replaced ic1 with an OPA 2134
(excellent result) but still have some great humming even when nothing
is connected to the input and mute is pressed. it's definitivle the
main board, not the AHA.
so i wanted to replace all those cheap noisy TL074 with the OPA 4134 -
unfortunately, the PA series (DIP14) is dead;-)

Changing op-amps won't affect humming one tiny bit. You have some other problem. Could be all sorts
of things. Take it to a tech.

Graham
Click to expand...
i am the tech! ;-) the humming is my 2nd problem, i first have to
solve the noise, and as the TL074 are pretty good noise generators, i
want to change them first to have a "clean hum" to start look for and
as the OPA 4134 is dead, i was looking for some other alternative.
 
GregS wrote:

Eeyore wrote:
GregS wrote:
Eeyore wrote:
GregS wrote:

I don't know why, but I was assuming audio applications.

That's what the TL07x series was designed for after all.

I have seen the TLO7x series in many applications.

Oh yes, they're very versatile and not especially expensive, so well adaptable
to mnay circuits, however that WAS their intended primary market.

For a long time I was bent on getting a TLO75 replacement. I guess
I got over it.

BTW, it's TL zero seven (five), not Oh (the letter) seven (five). Just being
pedantic ! ;~)

Graham

I have been saying TL O for 30 years. Now I stand corrected.
Click to expand...
I SAY it that way too but write it the other way. In the UK (and I'm sure the USA too) 'oh' is often
used colloquially to mean zero but not written like that.

Graham
 
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