The NE5532 is a popular operational amplifier used, among others, in audio systems, as a preamplifier, mixer or generator. This popular chip is often counterfeited, which can make a big difference in signal processing in your audio equipment. In particular, if someone is an audiophile and uses special gold plugs or a power cable for several thousand zlotys. As you can see, the only thing that can be recommended is that the preamplifier uses a counterfeit of the popular operational amplifier ;)
Jokes aside, the problem of counterfeit electronic components is huge. In our forum, we run a topic called fakes , which has now grown to 41 pages.
The blog team zeptobars.com dealing as a hobby with opening and, more precisely, dissolving the casings of integrated circuits with acid, opened the original NE5532 chip by Texas Instruments and bought a counterfeit from the famous eBay offer of 100 pieces for PLN 20. The effect is terrifying, the counterfeit not only has a smaller matrix, but also lacks many connections, you can say that only the basic things have been kept so that the system can work as an operational amplifier. On the forums, they noticed that the system is definitely much slower, the rate of rise is ~1.25V/µS, instead of 9V/µS.
Interestingly, they also opened the Philips NE5532A production system and the matrix was very similar to the original, it can be said that the parameters in this case will be preserved.
This popular chip is often counterfeited, which can make a big difference in signal processing in your audio equipment. In particular, if someone is an audiophile and uses special gold plugs or a power cable for several thousand zlotys. As you can see, the only thing that can be recommended is that the preamplifier uses a counterfeit of the popular operational amplifier
It seems to me that if someone is an audiophile and already has what you mention, he also replaced the opamps with more audiophile ones.
Counterfeits are a big bane of our times, sometimes it's really hard to avoid them. After all, we will not, like our colleagues, dissolve the circuit housings in acid to check whether the original.
It seems to me that if someone is an audiophile and already has what you mention, he also replaced the opamps with more audiophile ones.
How would they do it? Audiophiles have no idea about the theory of electronics, let alone the practice of soldering. Well, unless someone would set up a special "factory" engaged in such activities
How would they do it? Audiophiles have no idea about the theory of electronics, let alone the practice of soldering. Well, unless someone would set up a special "factory" engaged in such activities
I'm afraid that with them it's like in the past with drug addicts (perfect knowledge of the necessary piece of chemistry), and here this one procedure is manageable.
I had one NE5532 that when connected to the circuit just got hot as hell. Inserted in its place LM833 (identical pinout and similar parameters) worked correctly.
It was supposed to act as a W.CZ comparator. Then I moved it to an audio preamplifier where it didn't work at all. I substituted LM833 again and the system worked.
However, it's good to have even a basic oscilloscope. With such failures, you can lose faith in your own abilities. At first I thought I blew the power.
It seems to me that if someone is an audiophile and already has what you mention, he also replaced the opamps with more audiophile ones.
How would they do it? Audiophiles have no idea about the theory of electronics, let alone the practice of soldering. Well, unless someone would set up a special "factory" engaged in such activities
Oh buddy, I'm afraid you'd be very surprised if you started digging into the subject. Sure, there is a group of those who can't change anything in their equipment themselves (and maybe they don't even want to), but there is a really large group of those who have sockets in their equipment where there were factory-soldered opamps (not they necessarily soldered them themselves), but thanks to this they test dozens of different opamps to find sonic nuances.
Besides, how could counterfeit 5532s appear in their audiophile equipment?
One may ask, why did you concoct the comparator with the 5532 instead of using an integrated comparator for it?
One comparator and one buffer (that is, an amplifier with a gain of 1) were needed in the circuit.
In the original scheme there was just a W.CZ operational amplifier.
As it was impossible to buy it (analog devices product which is moderately popular in Poland) I had to look for something to replace it.
And since I only had the frequency (~5MHz) from the information about the signal, I was looking for this parameter.
At TME, in the case of operational amplifiers, you can filter by band. For comparators, such filtering is not possible. There is a propagation time, but you can't filter against it.
I often use TME as a kind of parts catalog and then I buy where it is convenient. As you can see, the source of the layout is important.
There is a simple method for counterfeit integrated circuits - buy from reliable sources. It's just that the costs then increase several times ...
But you know what you pay for. For hobby applications, I do not see the slightest sense of buying in China. Prices in wholesalers, i.e. DigiKey, Mouser, RS, etc. are slightly higher than in the Far East (and sometimes even lower). The difference can make a difference when you're buying 10,000 units, but if you're mass-producing something, you're probably trying harder not to have 10,000 returns.
Both integrated circuits and simpler (not necessarily cheaper) elements such as transistors are counterfeited. Apparently, there are also "empty" systems inside, only the type of housing / number of pins and the print on the housing match, no structure inside, someone has a production line where they produce "empty" layouts and only place the appropriate print depending on the order?
The blog team zeptobars.com dealing as a hobby with opening and, more precisely, dissolving the casings of integrated circuits with acid, opened the original NE5532 chip by Texas Instruments and bought a counterfeit from the famous eBay offer of 100 pieces for PLN 20. The effect is terrifying, the counterfeit not only has a smaller matrix, but also lacks many connections, you can say that only the basic things have been kept so that the system can work as an operational amplifier. On the forums, they noticed that the system is definitely much slower, the rate of rise is ~1.25V/µS, instead of 9V/µS. .
Why a fake now?
After all, so many famous companies boast that they are making newer and newer systems in the technology of smaller and smaller nanometers, and that they are supposedly much better and you should throw away the old ones and buy new ones - the supposedly better ones. And in fact, companies strive for lower and lower costs to make as many circuits from one monolith, and the thinner the paths, and in technology, more and more layers, the greater the losses and heating of the circuits, the greater the failure rate over time and the greater sales. But customers are being pushed into a different kit...
This technological advancement is also visible in these photos. Like the original - but made in old-fashioned and single-layer technology. [old version datasheet] And this fake is already a hit made in a newer technology - according to famous concerns it would be advertised as better - it is clearly visible that it is a technology of at least three layers of connections and there are modern transistors.
I suspect that the parameters of the newer one would be much better on the test bench, but it's like with tubes, that audiophiles say they sound better, and for electronics it's a misunderstanding, because even modern dachshunds don't have such distortion and uniqueness of parameters.
And finally, see how many manufacturers of this historic system there are http://www.alldatasheet.com/view.jsp?Searchword=Ne5532 - at the bottom of the page. How they have slightly different parameters, as well as the scheme, and notice the red writing
Quote:
[old version datasheet]
(it's a pity that you can't use colors on the electrode) Texas Instruments, when developing the system, had a problem with thermal parameters floating, so they used zeners5V made from the emitter/base junction of the transistor to polarize the operating points of the system, which resulted in soft clipping of the peaks with a stronger input signal, with modern transistors it is unnecessary, because the temperature hardly affects the operation of the system, so that the signal that enters comes out after amplification no shape change.
How different are the input control currents and the input resistance - and if there is an RC filter at the input, a thoughtless (idiotic) substitution of the system also changes the characteristics of this filter. And instead of telling audiophile nonsense, just look at the documentation of the circuit and replace the resistor in the input polarity.
Can we talk about fakes then? Or rather, some users are fakes who can't read the documentation. :D
And what the hell to open, digest in acid, etc ... It is enough to be able to read the documentation, and not to sow unnecessary ferment.
Or rather, some users are fakes who can't read the documentation.[/b] :D
And what the hell to open, digest in acid, etc ... It is enough to be able to read the documentation, and not to sow unnecessary ferment. [/quote]
As they say, "paper will accept anything". Measurements of actual parameters may differ significantly from those declared in the documentation. BTW, in even the cheapest devices from China, you will hardly find NE5532 from manufacturers other than TI, the Chinese also do not read the documentation and overpay instead of supporting native producers? From another purely technological side, you can clearly recognize the output stage transistors in the pictures that must withstand 70mA of short-circuit current, somehow I trust the ones in the photo on the left more and I trust TI engineers because they have experience and certainly appropriate technologies in their hands. The structure that has to withstand such a current simply needs to have a sufficiently large surface area. The one on the right, I doubt it could handle at least half of that, transistors have a much simpler structure and a smaller surface area.
Or rather, some users are fakes who can't read the documentation.[/b] :D
And what the hell to open, digest in acid, etc ... It is enough to be able to read the documentation, and not to sow unnecessary ferment.
As they say, "paper will accept anything". Measurements of actual parameters may differ significantly from those declared in the documentation. BTW, in even the cheapest devices from China, you will hardly find NE5532 from manufacturers other than TI, the Chinese also do not read the documentation and overpay instead of supporting native producers?
From another purely technological side, you can clearly recognize the output stage transistors in the pictures that must withstand 70mA of short-circuit current, somehow I trust the ones in the photo on the left more and I trust TI engineers because they have experience and certainly appropriate technologies in their hands. The structure that has to withstand such a current simply needs to have a sufficiently large surface area. The one on the right, I doubt it could handle at least half of that, transistors have a much simpler structure and a smaller surface area.
technological progress is moving forward and transistors in chamber pots are a thing of the past - read a bit about semiconductor technologies and don't write like a typical audiophile without knowing the basics of electronics. In addition, the larger the chip, the greater the capacity and noise level.
The problem is that fakes do not meet the parameters specified in the documentation, someone even measured it: https://www.eevblog.com/forum/reviews/chinese-fake-op-amps/ Unless they have their documentation, but then why do they have the same symbol as the original
The problem is that fakes do not meet the parameters specified in the documentation, someone even measured it: https://www.eevblog.com/forum/reviews/chinese-fake-op-amps/ Unless they have their documentation, but then why do they have the same symbol as the original
I've already written once
wada wrote:
And finally, see how many manufacturers of this historic system there are http://www.alldatasheet.com/view.jsp?Searchword=Ne5532 - at the bottom of the page. How they have slightly different parameters, as well as the scheme, and notice the red writing
Quote:
[old version datasheet]
(it's a pity that you can't use colors on the electrode) Texas Instruments, when developing the system, had a problem with thermal floating of parameters, so it used 5V zeners made from the emitter/base junction of the transistor to polarize the operating points of the system, which resulted in soft clipping of the tops with a stronger input signal, with modern transistors it is unnecessary, because the temperature is almost does not affect the operation of the system, so that the signal that enters, after amplification, comes out without changing its shape.
How different are the input control currents and the input resistance - and if there is an RC filter at the input, a thoughtless (idiotic) substitution of the system also changes the characteristics of this filter. And instead of telling audiophile nonsense, just look at the documentation of the circuit and replace the resistor in the input polarity.
And Texas Instruments itself has several datasheets - because it produces them in different factories
You most likely have an older operating system that is no longer supported by the manufacturer Use a different browser, e.g. mozilla firefox or use http:// instead of https:// in the link address
"And in addition, the larger the chip, the greater the capacity, and the noise floor."
Sorry, but this is complete nonsense, because there are definitely more factors here than just the size of the structure.
He is well aware that most of the currently available components are produced in Asia, and the same applies to the rigors that the products of a specific manufacturer must meet. Since you can find several different TI documentation for the NE5532, find one in which any parameter differs from the same in other documentation by more than a few %. the fact that you can find a dozen more documentation of this system from other manufacturers does not mean that you will ever meet these systems in some serial equipment. The paper will accept everything and on lm358 you can engrave NE5532 and maybe every 10th amateur or service technician will know, but certainly every manufacturer.
but there is a really large group of those who in their equipment, wherever there were factory-soldered opamps, now have a stand
Sockets for circuits in audiophile equipment? That's a crime
Why do you think so? Your equipment - your business.
Bioenergotherapy, audiophile, it's practically the same thing. According to some audiophiles, a cable laid in a brick tunnel transmits sound better than one lying on the floor. Well-known audiophiles, like these bio-energy therapists, do not agree to so-called blind tests. What else to discuss here?
So far, all the famous Bioenergotherapists have been unmasked (the famous Kaszpirowski), There is nothing to talk about his compatriot Nowak, you can read. There is no mention of "famous" audiophiles.
Let them have their own group of believers, but let them not speak on technical matters if it is not supported by evidence. Such "babble" mislead others, rarely causing various losses. Maybe intentionally, maybe not? Or maybe consciously, and they pretend not to?
The discussion centers around the NE5532 operational amplifier, widely used in audio systems, and the prevalence of counterfeit versions that can significantly impact audio quality. Users share experiences with counterfeit components, emphasizing the importance of sourcing from reliable suppliers to avoid issues. Some participants note that audiophiles often replace op-amps with higher-quality alternatives, while others express skepticism about the technical knowledge of audiophiles regarding electronics. The conversation also touches on the broader issue of counterfeit electronic components, including methods of detection and the implications for both hobbyists and professionals in the field. The need for proper documentation and the challenges of distinguishing genuine parts from fakes are highlighted, along with the technological advancements in semiconductor manufacturing. Summary generated by the language model.
:D
