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Old 10th October 2012, 05:40 PM   #1
Elvee is offline Elvee  Belgium
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Default ♫♪--My little posh Tringlophone--♪♫



Here is a new, unusual amplifier project: adaptive single-ended class A, feedback-free, error-correcting based on a tringlotron topology, you name it...

It nicely dodges the VFB<->CFB controversy: it doesn't belong to any of the category, being a ZFB type.

ZFB means Zero Feed Back, that is no global feedback.
It relies solely on the error correcting action of the tringlotron to achieve an excellent linearity

The previous project was no-nonsense, maximum bang for buck amp, but this one lavishes in an extravagance of luxury: 13 transistors, and no less than four 2N3055's as output devices!

All of that for a mere 10 ~ 12W per channel.....

Filthy rich....

Here is the schematic, details will follow
Attached Images
File Type: gif TheTringlophone.gif (304.5 KB, 1626 views)
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Old 10th October 2012, 06:30 PM   #2
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ZFB, SE Class A, EC, what more could one ask for? I am sure this amp lavishes a sweet sound! Thanks for your innovative contributions here. Much appreciated.
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Old 11th October 2012, 02:10 AM   #3
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This will send many folk scurrying to Google. Thanks for another great piece of inspiration and work, Elvee.
http://electronicdesign.com/Content/14978/60028_fig.gif
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Old 11th October 2012, 02:57 AM   #4
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Old 11th October 2012, 03:45 AM   #5
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the rest of the article on the basic element "tringlotron":

Adding three devices cleverly increases emitter-follower gain

_-_-

(...not like I really understand why it works...)
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Old 11th October 2012, 09:41 AM   #6
Elvee is offline Elvee  Belgium
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Let us look at how the circuit works.

Basically, it comprises two stages: a voltage amplifier having a gain a little greater than 20dB, and a unity gain power buffer.

Let us deal quickly with the VAS: it is the uninteressant part of the circuit (I somewhat had a lack of inspiration at the time).
It is simply a common emitter amplifier based on a CFP (Q12, Q13) for improved linearity.
It is followed by an interstage buffer (Q10, Q11) required to drive the output stage in good conditions.
Nothing particularly smart or original there, the VAS does its job properly, no less, no more.

The output stage:
Now, the interesting bit.
It is a Tringlotron topology, although it isn't apparent at first sight: it looks more like a Quaplotron (quadruplet of P devices in line).
It is actually a Tringlotron, but with some adaptations needed for (relatively) high power operation.

The original, plain vanilla Tringlotron was suitable for low power amplifiers, typically headphones. An example of such an amplifier was the Tringlinator.
But for a larger amplifier, the current and voltage overheads required for proper operation would lead to an excessive power dissipation.
In addition, the Tringlotron is basically a single-ended topology, even if this is not immediately apparent, with the attendant maximal power efficiency limited to 25%.

To deal with the increased power, the single devices have been replaced by CFP's. Since it is desirable to use only N power devices, the resulting composite is of P polarity.
The fourth element (Q1/Q2) is simply a CCS feeding the current into the "Tringle".
But it isn't simply a fixed current, like in a basic Tringlotron: the current is also modulated by the signal through R16/C10.
This improves the efficiency by reducing the tringle standing current, and increasing it when the signal demands it.

Does this change the nature of the single-ended Tringlotron?
Contrary to appearances, no: the Tringlotron correcting mechanism is independent of the standing current: all that is required is that it must be sufficient not to clip the signal.
Unlike a class A push-pull amplifier, the second half contributes in no way to the output power.
This means that this path is purely auxiliary and has no influence on the output signal and its quality: the amplifier remains a true single-ended class A, with its character entirely defined by the Tringlotron.

To be continued....
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Old 11th October 2012, 11:18 AM   #7
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Quote:
Originally Posted by Elvee View Post
Here is the schematic, details will follow
great!!!
I was looking for something similar for some time!
the only 2 things are fraighting me:
  1. why R28/L1 in no feedback amp?
  2. usinfg cfps... there are the discussions on this forum that it is very oscillating techique...
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Old 11th October 2012, 11:32 AM   #8
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by padamiecki View Post
[*]why R28/L1 in no feedback amp?
Clever observation.
The reason is that the Tringlotron synthetizes a ~zero impedance at the speaker terminals.
When it is loaded by a finite impedance, things are just fine.
However, capacitance also presents an impedance --> to zero at an infinite frequency.
And when you try to feed a zero ohm load with a generator also having a zero output resistance, matters go seriously wrong
Quote:
[*]usinfg cfps... there are the discussions on this forum that it is very oscillating techique...
You are free to use darlingtons instead: the circuit will work almost identically, but with less headroom and a reduced linearity, but nothing really alarming.
And such a circuit will certainly be more placid.
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Old 12th October 2012, 08:25 AM   #9
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Elvee
did you try correction error input stage like for HP version?
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Old 12th October 2012, 09:44 AM   #10
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Dear Elvee
I have at about 8 pcs old KD502 but no proper heatsink for them.
Is this possible to use modern TO247s?
please post some pics, maybe pcb?
also asc file for tringlophone?
PLEASE!
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