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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Recommend me a good quad soic opamp ?
Recommend me a good quad soic opamp ?
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Old 6th December 2016, 12:13 AM   #1
Greg32 is offline Greg32  Australia
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Default Recommend me a good quad soic opamp ?

Im building an active 2 way crossover and space is tight so i was thinking surface mount devices but im not sure what to look at in modern devices. Thanks Greg
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Old 6th December 2016, 08:18 AM   #2
deandob is offline deandob  Australia
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I'm in the same boat - building an active crossover and need more space on the PCB. It has been a while since I investigated the opamp 'du jour'.

Last time I checked it about 8 years back it was LM4562 and a brief search of the 'net shows this IC has fallen out of favour as too clinical and not musical (also a dual not quad).

So I have the same question - What is the latest fashion in opamps? :-)
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Old 6th December 2016, 08:37 AM   #3
Mooly is offline Mooly  United Kingdom
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Recommend me a good quad soic opamp ?
Do not discount the venerable TL074 (as long as your circuit impedances are not to low). Despite what you may read, the TLO series are capable of truly excellent performance when used for line level circuitry.

OPA1604 is a modern 'audiophile' smd only Quad part.

The 4562 dual opamp remains a personal favourite. Hard to fault this one.
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Old 6th December 2016, 08:57 AM   #4
00940 is offline 00940  Belgium
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opa4134. Good old workhorse. Drives correctly lower loads than the tl074 (can be useful for filters), sounds good, forgiving wrt implementation (not faster than necessary for audio), quite cheap, comes in soic14, jfet input makes it easy to implement.

Specs wise, it still holds its own against most newer devices, for audio use at least. Downsides may be highish power consumption and dropout.
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Old 6th December 2016, 09:30 AM   #5
OlegSh is online now OlegSh
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Recommend me a good quad soic opamp ?
OPA1644, another JFET input op-amp...

Regards,
Oleg
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Old 6th December 2016, 09:33 AM   #6
Greg32 is offline Greg32  Australia
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Thanks for the advice and recommendations, i was surprised at the cost here in Australia for an opa1604 or opa4134 they are both in the $8 region per unit. both seem like good candidates and more than capable.
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Old 6th December 2016, 09:38 AM   #7
Greg32 is offline Greg32  Australia
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Thanks Oleg, another candidate in the opa1644, specs also look very good.
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Old 6th December 2016, 10:33 AM   #8
OlegSh is online now OlegSh
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Recommend me a good quad soic opamp ?
Mouser prices for OPA1644 and OPA1604 are the same to a single cent... 5.28 plus the tax, so you have a choice between bipolar and JFET input parts.

Last edited by OlegSh; 6th December 2016 at 10:36 AM.
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Old 6th December 2016, 11:12 AM   #9
simon7000 is offline simon7000  United States
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The LME49743 is in production but no one seems to stock it. The LME49720 is a dual in stock most everywhere, current production and $3.00 each.

As with all LME types you will need to use a small inductor on the inputs. A 100 ohm resistor with ten turns of wire around it will do.
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Old 7th December 2016, 10:06 PM   #10
Greg32 is offline Greg32  Australia
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This xover will be running into a pair of class d boards, i have available dual 5.6v supplies or i can add an extra reg stage for higher rails if need be, any drawbacks using the +-5.6v supplies? regards Greg
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