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Old 8th July 2009, 02:21 PM   #11
hipanni is offline hipanni  India
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hi i am new bee please help me i need tone control circuits for stk ic's. I am also use tda1524,lm1036. But i am not satisfied.
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Old 9th July 2009, 06:27 AM   #12
akis is offline akis  United Kingdom
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Without looking at specs, I had thought that whatever the TL072 can do, the TL082 can do better. TL082, LM833, NE5534 were once the op-amps for audio use.
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Old 11th July 2009, 03:20 AM   #13
sangram is offline sangram  India
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TL07xx is the 'low noise' version of the TL08xx version. Though 18nv is not low noise by any means.

The OPA4132/4227 should be a good bet for you if you want to absolutely stick with DIP, though they are more expensive than the 4134.

NE5532/4 only has a single and a dual, no quad. Your options for high performance opamps become very limited when it comes to quads, as the quad design is optimised for cost. It is possible to hack a couple of duals into a circuit which had a quad, but likely the performance of the original itself did not merit anything better than the cheapest quad.

The LM349 is the worst possible choice for the application, it's not even a proper audio opamp. TL074 was pretty common in solid state pro gear but was one of the products that gave SS its terrible reputation (which it's still trying to shake off!). I have few in my junk box, and that's where they'll stay. If you look at Samuel Groner's article on opamp distortion, that 'wave bender' looks an absolute disaster for anything but the lowest resolution systems.

For tone controls, search for Baxandall tone control circuits on Google, even Rod Elliot has a pretty long page about them, tell you everything you need to know. I don't use them at all, except in my guitar amp. Most of the time, speaker tonality issues are caused by poor design or placement issues (mostly the latter), which tone controls cannot reliably fix.

Anyway, it's a pretty standard kind of circuit now. The Douglas Self tone control looks very interesting and different, but terribly complex to build. I would rather not try it, but if you want, it's in his book 'Self on Audio', Available on Google Reader.
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Old 11th July 2009, 04:48 AM   #14
hipanni is offline hipanni  India
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hi,
tl072,tl082,LF353,TDA2320 whi is better for audio tone control circuits








by


Kannan
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Old 11th July 2009, 05:28 AM   #15
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Greetings kausharma. Just a very minor point but I wonder if the second op amp (on the RHS) of your diagram in the first post is upside down? My screen is not very clear so it may be okay. You probably BUILT it the right way around!

Cheers, Jonathan
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Old 11th July 2009, 06:11 AM   #16
Mooly is offline Mooly  United Kingdom
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Quote:
Originally posted by hipanni
hi i am new bee please help me i need tone control circuits for stk ic's. I am also use tda1524,lm1036. But i am not satisfied.

The TL072 series is capable of trully excellent sonic performance.
With the very greatest respect I would suggest you need to look elsewhere in your audio setup.
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Old 11th July 2009, 06:57 AM   #17
akis is offline akis  United Kingdom
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Ah then I stand corrected. I had thought the TL082 was the good guy and the TL072 was the bad guy!
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Old 11th July 2009, 08:44 AM   #18
hipanni is offline hipanni  India
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Quote:
Originally posted by hipanni
hi,
tl072,tl082,LF353,TDA2320 which is better for audio tone control circuits








by


Kannan
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Old 11th July 2009, 10:02 AM   #19
teleman is offline teleman  Norway
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Hi Kaushama,

As you may already know, there are basically 3 major types of opamps
1.Linear bi-polar
2.JFET
3.CMOS

We'll deal only with the first two types for your needs.

I've tried or used TL06xx/TL072xx/TL82xx/ LF353/LM324/ NE5532
in most of my projects.
The best & opamps for my money are the NE5532 & TL072
These are "unreasonably" cheap and are excellent devices!
You'd be very suprised with regard to OPA devices in the articles mentioned below.

You should first consider certain parameters of these devices before choosing what's right for the job.

1.Open loop gain
2.Closed loop gain
3.Slew rate (SR)In
4.CMRR...
5.Gain Bandwidth Gain (GBW)
6.Input equivalen Noise- En (V)
7.Input equiv,Current-In ..I can go on..

Please read the following excellent articles before you select the best type/s for your needs.
http://www.sound.westhost.com
http://www.dself.dsl.pipex.com

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Old 11th July 2009, 10:46 AM   #20
AndrewT is offline AndrewT  Scotland
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you need high impedance after every filter.
This virtually demands a FET input stage after the filter elements.
Don't use a 5534 as the opamp in an active filter.

The tl07x is noisy and very intolerant of capacitive load on it's output.
Use a better behaved FET opamp for the filters.

The 5534 can still be used as the input and output buffers. Although again some more modern devices can do the job a little better at much higher cost.
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