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Old 6th August 2009, 01:44 PM   #1
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Default Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power?

Different Versions of only N-Channel MOSFETs in Audio Power Output Stages

I have read the comments by URL
NMOS Amplifier and
N-Channel mosfet amplifier schematic needed
and my idea was to start a new thread, where I begin an URL overview of different versions concerning power output stages with only N-CH MOSFETs. I was amazed about the wide range of circuit topologies regarded this kind of output power stages for audio amplifiers.

Until this day I have found the follow topologies

1) driving through differential driver stages
2) driving through phase splitting transistor (Totem-Pole like Bengt Ollson, Futterman or MOSFET-DOZ)
3) driving through phase splitting driver transformers
4) driving through current mirror phase shifter
5) Quasi complementary output stages
6) Version orf German's company "Protovision"
7) Version of NAD integrated amp "306"
8) driving through two op amps
9) Circlotron (lowest distortion)

Here my URL collections in this case

1) driving through differential driver stages like Hiragas Kaneda
http://www.amplimos.it/images/2SK1056AMP.bmp (tube diff amp driver for 2x2SK1056 output)
http://www.amplimos.it/images/2sk77...AMAHA%20B-1.gif Yamaha B1, diff-cascode driver stage
http://peufeu.free.fr/audio/schemas/Kaneda_Mosfet.jpg Kaneda, diff-cascode driver stage
http://www002.upp.so-net.ne.jp/VivaM...C_MOS_Amp.html similar to Caneda and B1
http://www.patentstorm.us/patents/5631608/claims.html (diff amp driver for N-channel VFET output)
http://www.wikipatents.com/5631608.html (diff amp driver for N-channel VFET output)
United States Patent 5783970

2) driving through phase splitting transistor (Totem-Pole like Bengt Olson, Futterman or MOSFET version of Elliott's DOZ)
http://www.tubecad.com/april_may2001/page8.html ("The Symmetrical and the Non-Symmetrical")
http://www.tubecad.com/articles_2001...tput_Stage.pdf (split load unity gain circuits)
http://sound.westhost.com/jll_hood.htm (basic description Totem Pole)
http://www.tubecad.com/april_may2001/page17.html (Totem Pole Power Buffer Gain <1)
http://www.tcaas.btinternet.co.uk/index-1.htm The JLH Class-A Amplifier, transistor phase splitting
http://www.amplimos.it/images/N-CH1.JPG (Olsson "Only N-Channel", transistor phase splitting driver stage)
Original article: Better Audio from non complements? from Bengt Olsson (B. Olson?)
Electronics World + Wireless World, December 1994 page 988
http://www.aussieamplifiers.com/ only N-Channel PCB power amplifier unit's
http://www.diyaudio.com/forums/show...p?threadid=4476 (Ollson scheme 07-20-2004 killerops zip)
http://sound.westhost.com/project36.htm (R.Elliot DoZ, Death of Zen, transistor phase splitting)
www.6moons.com/industryfeatures/zen/plh.pdf (PLH, Pass Linsley-Hood, switchable from SE to Totem pole)
http://www.diyaudio.com/forums/show...?threadid=14320 (phase splitting like Creek)

3) driving through phase splitting driver transformers like zeuz
http://www.diyaudio.com/forums/show...?threadid=24744 (driver transformer phase splitting)
http://www.susan-parker.co.uk/zeus.htm (CSPP? - transformer for input and output)
http://www.susan-parker.co.uk/zeus.htm (SEPP-source follower with input and output transformer)
http://www.tubecad.com/2004/blog0006.htm (Simple push pull)

4) driving through current mirror phase shifter
http://www.vegalab.ru/forum/attachme...7&d=1102664366 Current Mirror Driver + SERVO BIAS

5) Quasi complementary output stages like Zeta and old Pass A40
http://users.adam.com.au/cgpap/QuasiWeb/index.htm
Olive audio: lo longer online, please go to webarchive
http://web.archive.org/web/*/www.oliveaudio.com
http://web.archive.org/web/200504150...dex.php?page=2
(Home of the ZETA experimental N-Channel power amplifer, Lars Clausen
Enghavevej 12, DK7500 Holstebro, Denmark temporarely unfortunately only Class D
http://www.newclassd.com/index.php?page=96

6) Version orf German's company "Protovision", type "Reality 284"
http://www.singhkang.de/proto.html (Owner's Manual)
http://img530.imageshack.us/i/2841bb.jpg/ (Image top view)
for schematic go to my PDF schematics at bottom

7) Version of NAD integrated amp "306" go to my pdf schematic at bottom - topology not to find on the web (quasi complementary or not?

8) driving through second op amp for phase shifting
http://www.tubecad.com/2005/January/blog0034.htm "Taylor source follower"
http://www.datasheetcatalog.com/data.../TDA7294.shtml (integrated circuit TDA7294V)

9) Circlotron (lowest distortion aff all mentioned versions)
for looking URL collection go to URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage

ok, the circlotron is best of all, but what about the eight other versions, that I have found? Thank you very much for your comments
Attached Files
File Type: pdf protovision nad306 .ckt.pdf (44.8 KB, 1943 views)
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Old 6th August 2009, 02:42 PM   #2
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some URLs are maimed/distort above:
To Number 1
http://www.amplimos.it/images/2sk77%...MAHA%20B-1.gif Yamaha B1, diff-cascode driver stage
To Number 2
http://www.tubecad.com/articles_2001...ut_stage_psrr/
N-channel Problem HELPPPPPP (Ollson scheme 07-20-2004 killerops zip)
N-channel only output devices in a power follower. (Creek)
To Number 3
Push-Pull using only N-Channel MOSFETs (driver transformer phase splitting)
To Number 4
http://www.vegalab.ru/forum/attachme...7&d=1102664366 N-CHANNEL AMP + SERVO BIAS (Current Mirror Driver + SERVO BIAS)

Unfortunately, I do not know what I've done wrong because the addresses look like exactly as before
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Old 6th August 2009, 04:51 PM   #3
AndrewT is offline AndrewT  Scotland
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is it compulsory to read through all those links before we are allowed to post a comment or question?
Oops, just broke that rule!
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Old 6th August 2009, 04:59 PM   #4
KSTR is offline KSTR  Germany
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Quote:
Originally posted by tiefbassuebertr
some URLs are maimed/distort above
You used literal copies (cut&paste from screen), which when abreviated with "..." in between obviously give wrong URL's

Sorry for another metacomment.
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Old 6th August 2009, 08:31 PM   #5
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Let's see, I can think of three more, of which I can divulge two,
both classics:

Single-ended Class A systems, including SRPP and variants.

Balanced operation through output transformer

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Old 6th August 2009, 08:39 PM   #6
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One more: source follower loaded on a counter-modulated current source.

And, finally, one more: the same, but bootstrapped by one more source follower on top (it is what I breadboard currently, see my thread in a Vacuum Tube section of the forum)
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Old 6th August 2009, 09:13 PM   #7
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"Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power? "

Definitely yes. "Complimentary" N-Channel/P-Channel MOSFETs are a good deal less "complimentary" than NPN/PNP complimentaries. Stick to one or the other, but not both in the same circuit. MOSFETs aren't BJTs, and topologies originated for BJTs just won't work as well. Of course, the Big Box manufacturers like those OTL BJT topologies since no OPT is cheaper than the cheapest OPT.
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Old 6th August 2009, 09:44 PM   #8
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I think NMOS output stages working more stable without faults compare to BJT against SOA

Have sold 2 years ago 50 pcs. Mosfet PA amplifier.... since today 1 channel defective by clients, similar Class D amplifier faults less 1 %

but BJT amplifier/Toshiba 2SA1943 und 2 SC5200 inside, .... headache about 10 % faults/defective output devices,...amps from different professional supplier
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Old 6th August 2009, 11:00 PM   #9
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Quote:
Originally posted by Wavebourn
One more: source follower loaded on a counter-modulated current source.
I filed that under

"Single-ended Class A systems, including SRPP and variants"

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Old 6th August 2009, 11:04 PM   #10
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Quote:
Originally posted by Nelson Pass


I filed that under

"Single-ended Class A systems, including SRPP and variants"

In such case "Class A single ended and class A/AB quasi-complementary" would supersede all of them.

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