AD822, good TL062 replacement?

C

Carlos

Guest
Just bumped into it looking for quieter alternatives to the ubiquitous
TL062 for a battery powered bass guitar tone circuit. Ok, power
consumption is higher, but still much lower than the usual audio opamp
suspects, noise is decent, THD doesn't look bad. It's expensive but in
opamp world that means it costs $5 instead of $0.50 and I only need
one, so I think I'll manage. Any reason not to use it or any better
alternatives?

Many thanks,

Carlos
 
Carlos wrote...
Just bumped into it looking for quieter alternatives to the
ubiquitous TL062 for a battery powered bass guitar tone circuit.
Ok, power consumption is higher, but still much lower than the
usual audio opamp suspects, noise is decent, THD doesn't look bad.
It's expensive but in opamp world that means it costs $5 instead
of $0.50 and I only need one, so I think I'll manage. Any reason
not to use it or any better alternatives?
Click to expand...
The AD822 is a JFET replacement for an LM358 (half of an LM324)
or LT1013 single-supply opamp, featuring rail-to-rail outputs.
Both the single-supply and rail-to-rail aspects are attractive
for some applications (especially with a JFET input), but both
involve compromises that degrade the opamp's performance. There
are _much_ better choices for high-quality audio JFET opamps.


--
Thanks,
- Win
 
"Winfield Hill" <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote in
message news:co4v7f0p31@drn.newsguy.com...
Carlos wrote...

Just bumped into it looking for quieter alternatives to the
ubiquitous TL062 for a battery powered bass guitar tone circuit.
Ok, power consumption is higher, but still much lower than the
usual audio opamp suspects, noise is decent, THD doesn't look bad.
It's expensive but in opamp world that means it costs $5 instead
of $0.50 and I only need one, so I think I'll manage. Any reason
not to use it or any better alternatives?

The AD822 is a JFET replacement for an LM358 (half of an LM324)
or LT1013 single-supply opamp, featuring rail-to-rail outputs.
Both the single-supply and rail-to-rail aspects are attractive
for some applications (especially with a JFET input), but both
involve compromises that degrade the opamp's performance. There
are _much_ better choices for high-quality audio JFET opamps.
Click to expand...

Would you care to let us have your thoughts on high-quality audio op amps?

Graham Holloway
--
Thanks,
- Win
Click to expand...
 
clorenzo@eutelsat.fr (Carlos) wrote in message news:<bdab6169.0411250707.2362c7b7@posting.google.com>...
Just bumped into it looking for quieter alternatives to the ubiquitous
TL062 for a battery powered bass guitar tone circuit. Ok, power
consumption is higher, but still much lower than the usual audio opamp
suspects, noise is decent, THD doesn't look bad. It's expensive but in
opamp world that means it costs $5 instead of $0.50 and I only need
one, so I think I'll manage. Any reason not to use it or any better
alternatives?

Many thanks,

Carlos
Click to expand...
You might want to check out these chips
http://focus.ti.com/lit/ds/symlink/opa2134.pdf

gg
 
Glenn Gundlach wrote:

clorenzo@eutelsat.fr (Carlos) wrote in message news:<bdab6169.0411250707.2362c7b7@posting.google.com>...
Just bumped into it looking for quieter alternatives to the ubiquitous
TL062 for a battery powered bass guitar tone circuit. Ok, power
consumption is higher, but still much lower than the usual audio opamp
suspects, noise is decent, THD doesn't look bad. It's expensive but in
opamp world that means it costs $5 instead of $0.50 and I only need
one, so I think I'll manage. Any reason not to use it or any better
alternatives?

Many thanks,

Carlos

You might want to check out these chips
http://focus.ti.com/lit/ds/symlink/opa2134.pdf
Click to expand...
Supply current at 4mA / op-amp is somewhat more than a TL062. Not ideal for battery operated.


Graham
 
But are there any with the sort of power consumption of the AD822 (800
uA/amp), preferably in an 8PDIP package? My first choice would have
been the OPA2134 (what I normally use), but as someone else said at 4
mA/amp is on the high side for battery operation.

Many thanks again,

Carlos

Winfield Hill <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote in message news:<co4v7f0p31@drn.newsguy.com>...
> There are _much_ better choices for high-quality audio JFET opamps.
 
Karl Uppiano <karl.uppiano@verizon.net> wrote:

Looks like the JFET equivalent to the venerable 5534 (performance rated for
driving 600 Ohm loads). Nice choice.
Click to expand...
But it's not single supply.

--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
moskowit@core-sound.com Tel: 201-801-0812, FAX: 201-801-0912
 
Carlos wrote...
But are there any with the sort of power consumption of the AD822
(800uA/amp), preferably in an 8PDIP package? My first choice would
have been the OPA2134 (what I normally use), but as someone else
said at 4mA/amp is on the high side for battery operation.
Click to expand...
I'd say if you want 0.00008% distortion you'll have to pay the 4mA.
Perhaps you can afford more distortion? If so, how much?


--
Thanks,
- Win
 
Len Moskowitz wrote:

Karl Uppiano <karl.uppiano@verizon.net> wrote:

Looks like the JFET equivalent to the venerable 5534 (performance rated for
driving 600 Ohm loads). Nice choice.

But it's not single supply.
Click to expand...
The 5535 isn't 'single supply' either.


Graham
 
Winfield Hill <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote in message news:<co805202lsl@drn.newsguy.com>...
I'd say if you want 0.00008% distortion you'll have to pay the 4mA.
Perhaps you can afford more distortion? If so, how much?
Click to expand...
To be honest I think for this application something like 0.1% would be
more than adequate. The circuit is basically a unity gain input buffer
followed by the usual negative feedback tone control arragement with
+/- 20 dB boost/cut, so I'd say worst case would be G = 10 @ 5 kHz
(harmonics and all I don't expect much life above that freq, if any
the 15" speaker will filter it out anyway). Any candidates giving 0.1%
THD or better under those conditions plus better noise performance
than the TL062?

If not, what's the best I can do at or below 1mA/amp consumption?

Tnx+,

Carlos
 
Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote in message news:<41A7F359.60447CD5@hotmail.com>...

The TL072 @ 1.4mA typ per amp Icc is way the best bet IMHO.
Click to expand...
[snip]

Many thanks Graham and everyone else for your help. It does look as if
the TL072 will be the best option. I must admit I ovelooked it because
I assumed the specs would be similar to the 062, just higher power
consumption, but it looks more than adequate for this application.

Thanks again,

Carlos
 
Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote:

Looks like the JFET equivalent to the venerable 5534 (performance rated for
driving 600 Ohm loads). Nice choice.

But it's not single supply.

The 5535 isn't 'single supply' either.
Click to expand...
But the AD822 is. And since he's running from a 9VDC battery that's
desirable.


--
Len Moskowitz PDAudio, Binaural Mics, Cables, DPA, M-Audio
Core Sound http://www.stealthmicrophones.com
Teaneck, New Jersey USA http://www.core-sound.com
moskowit@core-sound.com Tel: 201-801-0812, FAX: 201-801-0912
 
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