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The most complex amplifier that you ever see
The most complex amplifier that you ever see
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Old 8th November 2017, 11:00 AM   #21
dadod is offline dadod  Croatia
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Quote:
Originally Posted by xrk971 View Post
GainWire mk3 CFA pre/phone amp with very low distortion

It is so complex that I can't get myself to finish building it.

Click the image to open in full size.
You can't call it complex, it's quite simple. Push yourself to finish it and you are going to be surprised by its sound. It's full stereo and power supply on one board (not showed in this schematic), that's way it looks complex.
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Old 8th November 2017, 11:06 AM   #22
billshurv is offline billshurv  United Kingdom
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The most complex amplifier that you ever see
Of course there is the £125000 Naim statement Naim Statement | Mono Power Amplifier | Naim NAP S1
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Old 8th November 2017, 03:35 PM   #23
Mark Johnson is offline Mark Johnson  United States
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The most complex amplifier that you ever see
Quote:
Originally Posted by mirlo View Post
I think I recognize the drawing style in post #4 (kind wanna say "schematic font") from old National Semiconductor ...

Also, I think there's more to it. Another page?
Where does the net Bias Buss go?
Schematic in post #4 comes from the IEEE Journal of Solid State Circuits, December 1978. There is indeed a second page of schematics. The schematic attached to Post #4 above, is the amplifier itself; the second schematic page (attached below) shows the only bias circuitry.

This 39 year old amplifier is still in production; DigiKey has hundreds on the shelf, and the TI Store will gladly sell you thousands.

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File Type: png title.png (34.0 KB, 392 views)
File Type: png bias_bus.png (38.6 KB, 392 views)
File Type: png TI_store.png (9.4 KB, 390 views)
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Old 8th November 2017, 07:01 PM   #24
DaveG is offline DaveG  United States
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Onkyo TX-NR906 AV receiver.

no ground breaking technology here - but the total overall complexity packed into the box is pretty high. Probably others in the HT world with even more.

I don't want to spend the time counting all the duplicate and parallel features for weighting this but the 100 plus pages of parts may at least have them grouped for easy counting.

There are 31 pages of schematics like these 2 in a 336 page service manual.
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File Type: pdf Onkyo A.pdf (148.6 KB, 72 views)
File Type: pdf Onkyo B.pdf (167.0 KB, 39 views)
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Old 11th November 2017, 03:55 AM   #25
Svitjod is offline Svitjod  Sweden
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Personally, I'm totally into simplicity, so when I stumble across a diagram of a complex one, I'll get shiverings along my spine.

This is my favorite hate-object.

It's a project from the dutch magazine Elektor from around 2000.

Elektor was a magazine not mainly for audio projects, so there were probably a lot of well educated engineers in the staff. When a typical engineer starts to construct things he immediately violates all of the common known audiophile rules of thumb. Such as low NFB, simplicity etc..

I made one amplifier and one DAC from the Elektor, and non of them sounded any good.
The DAC was an ambitious one and used very expensive opamps, I remember.
At the end of the article, the author said something like this:

"This DAC has so utterly low THD that it's virtues are impossible to judge by a human ear".

But my ears complained and some months later I constructed a new analog section.
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Old 11th November 2017, 04:42 AM   #26
Lazy Cat is offline Lazy Cat  Slovenia
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Ordinary linear PA ampís schematics:

QSC Powerlight PL9.0 sch.pdf

Enjoy.
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Old 12th November 2017, 01:04 AM   #27
CBS240 is offline CBS240  United States
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Quote:
Originally Posted by BesPav View Post
Good candidate:
My Bridge Amp
Ha Ha! How about the first construction of that circuit Here. if I remember, that amp sounded really good

It was damn FAST too!!
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Old 12th November 2017, 01:15 AM   #28
Ferchito is offline Ferchito  Colombia
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Quote:
Originally Posted by Mark Johnson View Post
Probably this amplifier. Click on the white "X" at lower left, to see it at full 100% magnification.

_
There are a National Semiconductor power amplifier chip, so this internal circuit diagram only was one monolithic piece, this thread look for some expensive audio amplifier circuits that's can show many of these monolithic circuits
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Old 13th November 2017, 01:48 PM   #29
Kay Pirinha is offline Kay Pirinha  Germany
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Quote:
Originally Posted by Svitjod View Post
Personally, I'm totally into simplicity, so when I stumble across a diagram of a complex one, I'll get shiverings along my spine.

This is my favorite hate-object.

It's a project from the dutch magazine Elektor from around 2000.

I think the impression of complexity in this Elektor design mostly results from both the voltage regulators and the triple 2nd VAS and drivers. Yes, and lots of current sources. Otherwise it's a rather straightforward design - diamond buffer with cascodes, 1st VAS, 2nd VAS, drivers, power devices. We even find something that is called CFA in this board.


I don't know why they opted for these triplications, though. Maybe they hadn't any more powerful driver devices in those days?


Best regards!
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Old 18th November 2017, 06:47 AM   #30
suzyj is offline suzyj  Australia
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Really anything that uses a monolithic opamp, either in the signal path or as a DC servo, is going to have >50 transistors.

Even without using monolithic parts it's possible to build the transistor count up fairly quickly. Symmetrical differential topology involves plenty of transistors, and more so with copious cascoding. An amplifier that I've been playing with in simulation (that once upon a time bore some semblance to David Tilbrook's AEM6000) has 44 transistors, though I'm cheating a little by including a DC servo in that count.
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