any op-amp recommendations?
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any op-amp recommendations?
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Anthony Fremont
Guest
Posted: Mon Nov 14, 2005 5:35 pm    Post subject: any op-amp recommendations? Reply with quote
I'm getting ready to order some junk from Digikey. Can someone
recommend good general purpose op-amps to stock for tinkering? I've
been using the 741 just because I had a few laying around, but I know
that better things exist. I've also got a couple of TL082s, but really
haven't done much of anything with them yet. The 741 has worked ok
(more or less) for me, but I want something with better gain at 40kHz
(ultrasound tinkerings) and that can go much closer to the rails since I
like to use 5V for power. Something that won't easily latch up would be
nice too. I don't need anything really fancy, just something relatively
inexpensive ($2 or so) and easy to use. BTW, I like to use solderless
breadboards for prototyping.

For comparators I use the LM393, is that still a reasonable choice or
should I stock up on something newer?

TIA

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Ken Smith
Guest
Posted: Mon Nov 14, 2005 5:35 pm    Post subject: Re: any op-amp recommendations? Reply with quote
In article <dla7s0$6tk$1@usenet01.srv.cis.pitt.edu>,
GregS <szekeres@pitt.edu> wrote:
[...]
Quote:
OPA134 for a traditional OP-AMP. Single version.Think of it
as a really beefed up TLO81. Power bypass caps are necessary
for high speed amps.

I'd worry about the OPA134 in a solderless breadboard.


--
--
kensmith@rahul.net forging knowledge
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Winfield Hill
Guest
Posted: Mon Nov 14, 2005 5:35 pm    Post subject: Re: any op-amp recommendations? Reply with quote
Anthony Fremont wrote...
Quote:

I'm getting ready to order some junk from Digikey. Can someone
recommend good general purpose op-amps to stock for tinkering? I've
been using the 741 just because I had a few laying around, but I know
that better things exist. I've also got a couple of TL082s, but really
haven't done much of anything with them yet. The 741 has worked ok
(more or less) for me, but I want something with better gain at 40kHz
(ultrasound tinkerings) and that can go much closer to the rails since I
like to use 5V for power. Something that won't easily latch up would be
nice too. I don't need anything really fancy, just something relatively
inexpensive ($2 or so) and easy to use. BTW, I like to use solderless
breadboards for prototyping.

For comparators I use the LM393, is that still a reasonable choice or
should I stock up on something newer?

My vote, for +/-15V supplies, is the LM412 dual JFET opamp.


--
Thanks,
- Win

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GregS
Guest
Posted: Mon Nov 14, 2005 5:35 pm    Post subject: Re: any op-amp recommendations? Reply with quote
In article <ga1ef.12307$3K6.4753@tornado.texas.rr.com>, "Anthony Fremont" <spam@anywhere.com> wrote:
Quote:
I'm getting ready to order some junk from Digikey. Can someone
recommend good general purpose op-amps to stock for tinkering? I've
been using the 741 just because I had a few laying around, but I know
that better things exist. I've also got a couple of TL082s, but really
haven't done much of anything with them yet. The 741 has worked ok
(more or less) for me, but I want something with better gain at 40kHz
(ultrasound tinkerings) and that can go much closer to the rails since I
like to use 5V for power. Something that won't easily latch up would be
nice too. I don't need anything really fancy, just something relatively
inexpensive ($2 or so) and easy to use. BTW, I like to use solderless
breadboards for prototyping.

For comparators I use the LM393, is that still a reasonable choice or
should I stock up on something newer?

TIA


OPA134 for a traditional OP-AMP. Single version.Think of it
as a really beefed up TLO81. Power bypass caps are necessary
for high speed amps.


greg
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redbelly
Guest
Posted: Mon Nov 14, 2005 5:35 pm    Post subject: Re: any op-amp recommendations? Reply with quote
Winfield Hill wrote:

Quote:
My vote, for +/-15V supplies, is the LM412 dual JFET opamp.


I'm wondering if that's a typo and you mean LF412?

I too have been on the lookout for an inexpensive general-purpose
op-amp, but with higher input impedance than the 741.

Thanks,

Mark
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Winfield Hill
Guest
Posted: Tue Nov 15, 2005 12:02 am    Post subject: Re: any op-amp recommendations? Reply with quote
redbelly wrote...
Quote:

Winfield Hill wrote:

My vote, for +/-15V supplies, is the LM412 dual JFET opamp.


I'm wondering if that's a typo and you mean LF412?

Yes, sorry.

Quote:
I too have been on the lookout for an inexpensive general-purpose
op-amp, but with higher input impedance than the 741.

Right.


--
Thanks,
- Win
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Vanheesbeke Stefaan
Guest
Posted: Tue Nov 15, 2005 12:25 am    Post subject: Re: any op-amp recommendations? Reply with quote
"Anthony Fremont" <spam@anywhere.com> wrote in message
news:ga1ef.12307$3K6.4753@tornado.texas.rr.com...
Quote:

For comparators I use the LM393, is that still a reasonable choice or
should I stock up on something newer?

TIA


LM393 the best price/perfamance comparator ever made.
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Anthony Fremont
Guest
Posted: Tue Nov 15, 2005 12:29 am    Post subject: Re: any op-amp recommendations? Reply with quote
"Winfield Hill" <Winfield_member@newsguy.com> wrote

Quote:
My vote, for +/-15V supplies, is the LM412 dual JFET opamp.

Thanks. :-) Any recommendations for something in the 5V single supply
arena?
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Anthony Fremont
Guest
Posted: Tue Nov 15, 2005 12:33 am    Post subject: Re: any op-amp recommendations? Reply with quote
"GregS" <szekeres@pitt.edu> wrote

Quote:
OPA134 for a traditional OP-AMP. Single version.Think of it
as a really beefed up TLO81. Power bypass caps are necessary
for high speed amps.

Thanks. :-) I looked at the datasheet and it seems like a real nice
part especially for audiophile applications. Fast and really low
distortion, but it sounds like it may be a bit wild for the breadboard.
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Walter Harley
Guest
Posted: Tue Nov 15, 2005 12:34 am    Post subject: Re: any op-amp recommendations? Reply with quote
"Ken Smith" <kensmith@green.rahul.net> wrote in message
news:dla967$890$2@blue.rahul.net...
Quote:
In article <dla7s0$6tk$1@usenet01.srv.cis.pitt.edu>,
GregS <szekeres@pitt.edu> wrote:
[...]
OPA134 for a traditional OP-AMP. Single version.Think of it
as a really beefed up TLO81. Power bypass caps are necessary
for high speed amps.

I'd worry about the OPA134 in a solderless breadboard.

I've prototyped a lot of circuits with OPA134 in solderless breadboards; no
problem. It's not really blazingly fast - good audio opamp but not the sort
of thing that will get you in trouble.

However, it's rather expensive as a "jellybean" opamp. I usually prototype
first with something cheaper, e.g. TL08x, and then plug in the OPAx134 at
the end.
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Anthony Fremont
Guest
Posted: Tue Nov 15, 2005 12:35 am    Post subject: Re: any op-amp recommendations? Reply with quote
"Vanheesbeke Stefaan" wrote:

Quote:
LM393 the best price/perfamance comparator ever made.

Cool, I guess I'll stick with them then. :-)
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Anthony Fremont
Guest
Posted: Tue Nov 15, 2005 1:35 am    Post subject: Re: any op-amp recommendations? Reply with quote
"John Popelish" <jpopelish@rica.net> wrote

Quote:
For 5 volt supply, I like the MCP6022-I/P, dual, rail to rail, 10 MHz
GBW product (gain of about 250 at 40 kHz), made by Microchip, the
people who make the PIC microprocessors. Digikey sells these for
$1.80 each.

Way cool! I think I'll buy me a few. :-) The chip select feature is
pretty nice and I like that cute Vref available on a couple of the
sibling models. I couldn't find anything in the datasheet on how much
of a drain the Vref added on the power supply, but with total quiescent
current at about 1mA, who cares. ;-)

Quote:
http://rocky.digikey.com/WebLib/Microchip/Web%20Data/MCP6021,2,3,4.pdf

But a good, cheap jelly bean amplifier for low frequency use is the
dual LM358. Works from the negative rail up to 1.5 volts below the
positive rail. About $0.50 each.

I'll look at the datasheet, but the microchip op-amp looks like it just
might be the one. Thanks again.

Quote:
For comparators I use the LM393, is that still a reasonable choice
or
should I stock up on something newer?

I still use lots of those and the quad LM339, also.
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John Popelish
Guest
Posted: Tue Nov 15, 2005 1:35 am    Post subject: Re: any op-amp recommendations? Reply with quote
Anthony Fremont wrote:
Quote:
I'm getting ready to order some junk from Digikey. Can someone
recommend good general purpose op-amps to stock for tinkering? I've
been using the 741 just because I had a few laying around, but I know
that better things exist. I've also got a couple of TL082s, but really
haven't done much of anything with them yet. The 741 has worked ok
(more or less) for me, but I want something with better gain at 40kHz
(ultrasound tinkerings) and that can go much closer to the rails since I
like to use 5V for power. Something that won't easily latch up would be
nice too. I don't need anything really fancy, just something relatively
inexpensive ($2 or so) and easy to use. BTW, I like to use solderless
breadboards for prototyping.

For 5 volt supply, I like the MCP6022-I/P, dual, rail to rail, 10 MHz
GBW product (gain of about 250 at 40 kHz), made by Microchip, the
people who make the PIC microprocessors. Digikey sells these for
$1.80 each.

http://rocky.digikey.com/WebLib/Microchip/Web%20Data/MCP6021,2,3,4.pdf

But a good, cheap jelly bean amplifier for low frequency use is the
dual LM358. Works from the negative rail up to 1.5 volts below the
positive rail. About $0.50 each.

Quote:
For comparators I use the LM393, is that still a reasonable choice or
should I stock up on something newer?

I still use lots of those and the quad LM339, also.
Back to top
Winfield Hill
Guest
Posted: Tue Nov 15, 2005 8:55 am    Post subject: Re: any op-amp recommendations? Reply with quote
GregS wrote...
Quote:

OPA134 for a traditional OP-AMP. Single version.Think of it
as a really beefed up TLO81. Power bypass caps are necessary
for high speed amps.

I don't like getting into bed with an opamp with no schematic.


--
Thanks,
- Win
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Andrew
Guest
Posted: Tue Nov 15, 2005 9:35 am    Post subject: Re: any op-amp recommendations? Reply with quote
For rail to rail apps (in and out), I love the TI TLV237x family.

-- Andrew

"Anthony Fremont" <spam@anywhere.com> wrote in message
news:ga1ef.12307$3K6.4753@tornado.texas.rr.com...
Quote:
I'm getting ready to order some junk from Digikey. Can someone
recommend good general purpose op-amps to stock for tinkering? I've
been using the 741 just because I had a few laying around, but I know
that better things exist. I've also got a couple of TL082s, but really
haven't done much of anything with them yet. The 741 has worked ok
(more or less) for me, but I want something with better gain at 40kHz
(ultrasound tinkerings) and that can go much closer to the rails since I
like to use 5V for power. Something that won't easily latch up would be
nice too. I don't need anything really fancy, just something relatively
inexpensive ($2 or so) and easy to use. BTW, I like to use solderless
breadboards for prototyping.

For comparators I use the LM393, is that still a reasonable choice or
should I stock up on something newer?

TIA
Back to top
 
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