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Pooh Bear
Guest
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 Posted:
Sat Nov 27, 2004 6:13 am Post subject:
Re: AD822, good TL062 replacement? |
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Len Moskowitz wrote:
| Quote: | 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.
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The 5535 isn't 'single supply' either.
Graham
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Pooh Bear
Guest
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| Posted:
Sat Nov 27, 2004 6:13 am Post subject:
Re: AD822, good TL062 replacement? |
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Winfield Hill wrote:
| Quote: | 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.
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?
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He wants the lower noise.
I've been struggling to think of a better device in this application -
i.e. noise vs current draw.
If I have any inspiration, I'll post it.
TL071/2 is lower current at 1.4mA typ per amplifer but noise is higher
at 18nV / rt Hz than the OPA2134's 8nV / rt Hz although lower than the
062's 42 nV / rt Hz ( with it's 200uA typ per amplifer Icc ).
Practice suggests that TL072 is a good compromise choice. It also has
good typified distortion figures. It will work pretty well in this
application.
I recall incorporating 072s into a product back in 1980 when they were
pretty new.
I think the similar LF351/3 from Nat Semi offer 12nV / rt Hz ( subject
to memory accuracy here ) but unsure of Icc.
Lol - the book was on the shelp. 1.8mA / amplifier and 16nV / rt Hz.
The LF351/3 have a habit of being a little more 'touchy' though. Prone
to oscillating given half a chance.
Graham |
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YD
Guest
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| Posted:
Sat Nov 27, 2004 6:07 pm Post subject:
Re: AD822, good TL062 replacement? |
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On 26 Nov 2004 11:28:34 -0800, Winfield Hill
<hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote:
| Quote: | 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.
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?
|
Hey, it's for a guitar. To get the "tone" it's wrung through a chain
of filters, clippers, distorters, echoes and other effects beyond all
recognition so why worry about a little bit of distortion at the
source?
Having said that, I make and sell a tone filter preamp for a guitar
making friend of mine using the TL072. It's basically unity gain, but
since the pickup signal normally is rather large (~ 100mV) the
subsequent gain is kept low enough to make the noise imperceptible. At
least there haven't been any complaints about it.
I have also examined other preamps, some of which were hissy and/or
distorty as all hell, those are usually badly designed bjt circuits.
They usually come my way because the owner wants to replace it with my
quieter version.
- YD.
--
Remove HAT if replying by mail. |
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Carlos
Guest
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| Posted:
Mon Nov 29, 2004 12:15 pm Post subject:
Re: AD822, good TL062 replacement? |
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Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote in message news:<41A7F359.60447CD5@hotmail.com>...
| Quote: | The TL072 @ 1.4mA typ per amp Icc is way the best bet IMHO.
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[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 |
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Len Moskowitz
Guest
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| Posted:
Tue Nov 30, 2004 12:20 am Post subject:
Re: AD822, good TL062 replacement? |
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Pooh Bear <rabbitsfriendsandrelations@hotmail.com> wrote:
| Quote: | 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.
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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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