Issues when replacing tl072 high pass filter with ne5532

[prabanjas]

Hi,

Having tl072 high pass filter. But I want more crystal clear quality so decided to replace with 5532. May I do it without modifying the circuit??

Is it give good result?? or any other suitable and hi-fi chip available??

thx

 

[Audioguru]

ne5532 versus tl072

The TL072 has FET inputs and is pretty good but is old.
The NE5532 is pretty good, has ordinary transistors on the inputs but is old.

The OPA134, OPA2134 and OPA4134 have FET inputs, much lower distortion, very low noise and wide bandwidth for audio.

 

[prabanjas]

Re: ne5532 versus tl072

very very thx..

Which is most similar to TL072 to replace without circuit modification..

 

[betwixt]

Re: ne5532 versus tl072

From experience, you will hear no difference!

However, a warning about the NE5532 it functions almost identically to the TL072 but it has parallel 'head to tail' diodes across it's input pins. It means you cannot use them if your differential input voltage will exceed 0.6V.

Brian.

 

[Audioguru]

Re: ne5532 versus tl072

The TL072 has the problem called "Phase Inversion" where the output suddenly goes high if an input voltage gets within about 3V from the negative supply voltage.

 

[FvM]

ne5532 versus tl072

I'm not aware of TL072 and similar types showing phase reversal.
Do you know specific conditions to produce it?

 

[Audioguru]

Re: ne5532 versus tl072

I'm not aware of TL072 and similar types showing phase reversal.
Do you know specific conditions to produce it?

I think the National Semi's LF353 and LF355, LF356 and LF357 also have the phase reversal problem.

I have made many audio products with the TL07x opamps and have never heard phase reversal. If the gain is low and you drive the input to a voltage that is close to the negative supply voltage then they say it happens because then the input voltage is not within the allowed input common-mode voltage range.

It might make an unusual electric guitar effect.

 

[pauloynski]

Re: ne5532 versus tl072

I doubt you´ll hear any difference by just changing any op-amp unless you have a very poorly designed circuit. Problems can happen,indeed, if you are running at a very hugh gain but the problem may also not be your high pass filter.

Added after 57 seconds:

Please post your circuit.

 

[prabanjas]

Re: ne5532 versus tl072

Hi,


I build exactly what it shown in diagram except I used 0.68ufd instead of 1ufd which was only available in my stock.

Actually my circuit working fine. Its good and clear. Its not reflecting tiny sounds and having very little distortion. I just want to improve the clarity and more definition in sound. Used IC base for tl072 so its easy to replace. If I want to replace with opa2134 or 5532 what modification should do?

I build this for 5.1 audio surround with TDA2030 per channel.

For sub I am using mosfet(sk series ).

 

[pauloynski]

Re: ne5532 versus tl072

First stage is a unity gain first order lowpass filter at roughly 1kHz. Second stage is a highpass filter. So, what you have here is a bandpass filter. Nothing wrong with it. You´ll get nothing by changing the op-amp. At any usual audio levels the distortion of this circuit is (my opinion) better then the distortion figure of the TDA2030 amp. I think what you need is an equalizer or tone control (or a better amp and loudspeakers).
Regards

 

[prabanjas]

Re: ne5532 versus tl072

can u suggest me a better amp for this scematic with high definition.

Thx in advance..

 

[pauloynski]

Re: ne5532 versus tl072

The LM3886 is a good choice for a poweramp but it is my opinion that your prblem is in the loudspeakers or you need some equalization. No op-amp will give an audible better output for your bandpass filter.
Regards

Added after 3 minutes:

The TL072 gives you, by far, much more than you can hear.

 

[Audioguru]

ne5532 versus tl072

I previously recommended the OPA12134 that is low noise and has very low distortion.
You won't hear any difference from the excellent TL072 because you cannot hear the 0.003% distortion of the TL072.
The OPA2134 has a distortion of only 0.00008%.

Some paranoid audiophiles operate the output transistors in the OPA2134 in class-A "to reduce its distortion".

 

[pauloynski]

Re: ne5532 versus tl072

And to complement Audioguru´s post: it is hard to find an equipment to measure such a low distortion. Check the specs. of your amplifier and you´ll see that its distortion is much greater than the distortion of the TL072 and, probably, you can´t hear it. And your loudspeakers have a distortion that is hundred times greater too. May be you need to define us what do you mean by "crystal clear quality". In my opinion, having a reasonably mid quality electronics, the loudspeakers make all the difference.

Added after 2 minutes:

A suggestion: connect your amp but bypass the bandpass filter and tell us if you can hear some meaningfull difference.

 

[prabanjas]

Re: ne5532 versus tl072

yes, you are right...

When I connect directly hearing lot of noise and its less clarity.

I have only 2.5 inch small woofers for surround and I changed the speakers with 2 way and it improves the sound and voice clarity.

thanks.

For more result I have to change the amp...

 

[pauloynski]

Re: ne5532 versus tl072

But if you google for a while you´ll find that there are some good loudspeaker boxes using very small speakers (down to 2 inches) and showing amazing low freq. responses. This page may help you http://www.quarter-wave.com/ but there are some DIY projects using smaller speakers. It seems your problem is in the loudspeakers and not in the amplifier. However, a LM3886 is still a good amp. choice.

 

[prabanjas]

Re: ne5532 versus tl072

I have 12 0 12 5A rail which gives ±15 v after regulated is it enough to drive 5 numbers of LM3886 (If I get 15-20w output is enough for me).

 

[pauloynski]

Re: ne5532 versus tl072

No, the LM3886 needs a minimum of 20V.

 

[prabanjas]

Re: ne5532 versus tl072

Any other nice chip which can work better at ±15??

 

[pauloynski]

Re: ne5532 versus tl072

Sorry if I´ve made a mistake. If you have +15 and -15V you can use the LM3886 amp. Otherwise take a look at the TDA1554 but I´m not sure it is the best choice.