Re: ultra low noise alternative

On 6 Aug., 15:29, zekfr...@xxxxxxxxxxxxxxxx (GregS) wrote:
In article <g7c8q0$5n...@xxxxxxxxxxxxxxxxxxxxxxxxx>, zekfr...@xxxxxxxxxxxxxxxx (GregS) wrote:
In article <4898CBEA.CB074...@xxxxxxxxxxx>, Eeyore
<rabbitsfriendsandrelati...@xxxxxxxxxxx> 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

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;-)
.

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