A pure Class A headphone amplifier - How to Build
Some time ago I made myself a pure Class A headphone amplifier. I am not Audiofile, but in my opinion the structure works very nicely, the sound is dynamic and clear. Unfortunately, I don't have oscillograms, however the is no noise.
Over time, the amplifier has developed a DAC that converts the signal from SPDIF into an analog signal, and now tests it with the PCM2706 as a USB->SPDIF converter.
As for the construction itself, it was a bit of fun with pairing transistors, and in the startup phase with a bias setting, but the general one moved out of the hoof:)
The whole system was successfully closed in the Z-112 enclosure.
Project author's website: Dynalo headphone amplifier by Kevin Gilmore
Comments
Is class A this should not be a current source + control transistor? [Read more]
The standalone degree can work in class A as much as possible. However, I do not know what the term "pure" means in this case? [Read more]
And such a bit of the word Tile from the English name under which I found this scheme ;) [Read more]
Just "clean" it would seem to me that the transistor + source (for very small powers: transistor + resistor), as in HF And so we have AB more in the direction of A. And recently fashionable in ecology... [Read more]
Plates You did and it was possible to print so badly mounted. Can not you give him a plate? [Read more]
Trafo was purchased after the tiles were made. The author, unfortunately, did not share the project files so that you can edit the tiles, although such a simple change could be made in any pain. Finally... [Read more]
None of these things, the jargon term "pure class A" simply means the lack of even a temporary cut-off of any of the active elements throughout the signal period, in contrast to the systems in shallow... [Read more]
It is an amplifier with a typical power stage design in the AB class. You set a large quiescent current in it (incorrectly calling it in the Polish bias) without changing the basic design of the AB class. Another... [Read more]
I see that not only I do not know the A-class knowledge there. And I thought he had something with eyes. I even signed up to an ophthalmologist for 2050. [Read more]
There is no such thing as a typical power grade design in the AB class. It is a typical construction of the anti-progress power stage. However, the operating class depends not only on the value of the... [Read more]
Here I would argue. Sometimes a passing tram is quieter than the music from the headphones of the person standing next to it. As for the class of work, it is the same as with the amplifier system, EC... [Read more]
@OTLamp - read my post and try to understand what I wrote, without adding my own theory to my opinion about this amplifier. The horse that is - everyone sees; here the amplifier diagram... [Read more]
Is not. This is a typical design of a series anti-parallel amplifier. And that's it. The class has nothing to do with it, the scheme is exactly the same regardless of the class. The fact that most amplifiers... [Read more]
It is strange to make a new destiny - only class A - for a complicated amplifier designed for AB (shallow in A and deep in B). Why? Because in such an amplifier, solutions for overcoming problems (mainly... [Read more]
I do not judge this structure in terms of technology, the appropriateness of using class A, connecting small transistors in parallel, etc. I am not interested in this moment. However, I am opposed to mindless... [Read more]
Power amplifiers can be built, among others as so-called "single ended" and "push-pull". What the author has presented is a typical "push-pull" design. Whether she will work in class A or in class B depends... [Read more]
@OTLamp - stay in your views, but let them have others. Terminology and terminology have been used for several decades in electronics not for the sake of reality, but for the easy determination of things,... [Read more]
Technical disciplines to which electronics belong are not based on views, only on facts. The fact that the amplifier discussed here works in Class A has been demonstrated above (160 mW at load 32 & # 937... [Read more]
Hello, Where did your colleague buy transistors? And at what price? [Read more]