Op Amps good to have at home in your box

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#21
I use the LF412 a lot since I bought many cheap and they tested well in one of Cordell's publications.

I recently bought some TL074's since a quad is fantastic for perf board construction.

I see the LM324 getting slammed. Can someone recommend a good cheap bipolar input quad op amp?
 
#24
Mooly said:
4558's, TL071/72, NE5532 and 741's will let you experiment with most projects whether they be audio or not.
Click to expand...
I have TL071/072, and NE5532/5534 in the parts box. That is enough for 99% of my projects.

I've used 741's when I was a child a long time ago, but not since then. They were wonderful for their time, but that time has long since gone.

For audio, I have never heard the slightest improvement over the 5532 / 5534 from any of the technically better op-amps, so I don't bother with them. Sometimes "new and improved" is merely new, and no worthwhile improvement is actually possible.

The only other type of op-amp I've occasionally found a need for was something with a MOSFET output stage that can swing all the way to its supply rails, like the old TLC272. There are a few oddball applications where you need that ability.

-Gnobuddy
 
#25
Here are some of the ones I've put into drawers. There are quite a few more lying around in their Mouser shipping bags, waiting to be scooped up and organized into some of those still empty slots.
 

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#26
oh pissoff, sendsome myway





hey LineUp,

Are you using the single opamp extra circ?

comp bal.png

With single opamps:
132/4
604 @24V
5534
AD797

As Andrew T said

"...
The dual only has access to the three standard in/out pins, whereas the single has all 6pins available.
The internal unity gain compensation of the dual makes it's electrical performance significantly different.
...."
 
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#28
Gnobuddy said:
I've used 741's when I was a child a long time ago, but not since then. They were wonderful for their time, but that time has long since gone.

For audio, I have never heard the slightest improvement over the 5532 / 5534
Click to expand...

Paraphrasing 1:Corinthians 13:11 ,,, "When I was a child, I engineered like a child..."

I think that TI has put some extra goodness in their range of NE5534. Just sounds great.

I still like the LM4562 for a dual.

OPA2604 is another.

Unlike Mark, I keep my legged opamps on static free foam and sort by manufacturer -- I have not married Analog and Linear Tech yet, they remain celibate and in their own prophylactic enclosures.
 
#29
LF412 and NE5532 suffice for most of the signal path portion of my audio work. But I go through more LM358 and LM324 than I do the other two - for all the support circuitry which is common to equipment which doesn't use op amps in the signal path. Also lots of LM311 and 339.
 
#31
johnego said:
I just checked your circuit. Your power supply is +/-10V. Even with +/-15V, OPA2604 performance is unacceptable. It needs higher rail to perform (that's why it is often lost in an op-amp rolling).

ADD:
And have you checked OP275? It's another underdog op-amp because it doesn't perform well in a conventional circuit.
Click to expand...

Ah, I must not have carefully checked the datasheet! Thanks 🙂 I haven't looked at the OP275.

Tony.
 
#33
AudioLapDance said:
oh pissoff, sendsome myway
hey LineUp,
Are you using the single opamp extra circ?

View attachment 681742

With single opamps:
132/4
604 @24V
5534
AD797

As Andrew T said

"...
The dual only has access to the three standard in/out pins, whereas the single has all 6pins available.
The internal unity gain compensation of the dual makes it's electrical performance significantly different.
...."
Click to expand...
Yes, I can use the 'extra pins'.
For example NE5534and unity gain, there is a cap 22pF to add.
Also can use 2 pins to adjust offset.

There are 2 reasons why I fancy single op amps.
1. The easier design of pcb. With dual op amp the card get 'crowded'. While I can have more space with two single op amps.
2. The maximal power. Two in a dual gives only half the power for each. The single op will run cooler.
 
#34
johnego said:
I just checked your circuit. Your power supply is +/-10V. Even with +/-15V, OPA2604 performance is unacceptable. It needs higher rail to perform (that's why it is often lost in an op-amp rolling).

ADD:
And have you checked OP275? It's another underdog op-amp because it doesn't perform well in a conventional circuit.
Click to expand...
There is at least one thing that speaks for OP275.
Power supply can be max +/-22 Volt.
The same goes for NE5534.

Many op amps are restricted to +/-18V.
For example LME49710 is recommend to run at +/-17 Volt.

OPA604 can take +/-25 Volt. Absolute max.
It is unusual.
 
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#35
Gnobuddy said:
For audio, I have never heard the slightest improvement over the 5532 / 5534 from any of the technically better op-amps, so I don't bother with them. Sometimes "new and improved" is merely new, and no worthwhile improvement is actually possible.

-Gnobuddy
Click to expand...

Ain't that the truth. For low gain, low noise circuits, the 5532 does it all except for low offset. It behaves as a voltage follower with no fussing. It's low noise. It does not mess with the sound.

I like to DC cascade circuits as much as possible. OPA2134 is limited as a follower but works fine as an inverter. I cascade inverting circuits; 2134 goes in front, then 5532. In practice this works great and yields acceptable offset (less than 20 mV) without optimizing DC parameters.
 
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