"Dave Plowman (News)" wrote in
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In article
, Arny
Krueger wrote:
"Trevor Wilson" wrote in
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Dave Plowman (News) wrote:
I need to knock up some stereo (domestic) line level
amps with a gain of 0-10dB.
Using a +/-15 volt supply. Anything better than the ol'
NE 5543 for this these days?

**The 5534/5532 were fabulous OP amps back in '82. MUCH
better than the OP that preceded them. It takes a
seriously decent product to be any better and, at that,
there's only marginal audio differences in the newer
ones. Personally, I like the AD825. Technically, it is
nicer than the 5532 and slightly nicer sound-wise.

Here we see Trevor perpetuating the myth that you can
taste test the "flavor" of different very good op amps
in a general sort of way.

It turns out that in the application being discussed,
namely a unity gain buffer with output of 2 volts into
a 10k load, even a 741 would probably sound good.

There are some impressive new op amps that have recently
come onto the marketplace, but they are mostly a study
in impressive numbers, and of use for instrumentation.


I actually want a variable gain of between 0 - 10 dB. So
need an output of rather more than 2 volts into 10k -
plus headroom.
I know the 5534 will be fine for this - but given the age
just wondered if there was something better, as it were.


Depends on how you define better. If by better you mean more GBW, lower
distoriton, noise and offset performance optimized for different working
impedance levels, lower power consumptiion, lower voltage power supply, high
voltage power supply and output, then there are other choices.

For general purpose applications and $0.50 or so, a 5534 or 5532 is pretty
hard to beat. Most of the audio projects I've built had 5534 or 5532 op amps
in them. In the past they were over $2.00.

The "hot" audio chips of the day a

LME49860 LME49710s, LME49720 LME49740 LM4562 LME49600

OPA 134, OPA 2134 OPA 4134 OPA365 OPA1161 OPA1162 OPA1612