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Old 25th September 2011, 07:56 PM   #11
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Quote:
Originally Posted by jaycee View Post
Why on earth would you choose to use crap like the TIP41/42 as drivers to 2SC3281/2SA1302's...
I guess LC knew something you don't. LOL!
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Old 25th September 2011, 08:45 PM   #12
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Quote:
Originally Posted by SemperFi View Post
I guess LC knew something you don't. LOL!
If LC refers to me I can assure you that I never used TIP type of BJT's anywhere. BF471/472 in my schematics are completely different kind of animals, for pre-drivers only.

For drivers I would certainly recommend something like 2SA1930/2SC5171.

And for outputs not a crap as 2SC3281/2SA1302 but something like 2SA2121/2SC5949.
Attached Files
File Type: pdf 2SA1930.pdf (166.3 KB, 95 views)
File Type: pdf 2SC5171.pdf (168.7 KB, 57 views)
File Type: pdf 2SA2121.pdf (158.8 KB, 71 views)
File Type: pdf 2SC5949.pdf (128.4 KB, 79 views)

Last edited by Lazy Cat; 25th September 2011 at 08:51 PM.
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Old 25th September 2011, 08:58 PM   #13
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LC is the constructor of the OP's amp. Think its Lars Clausen or something Danish like that.
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Old 25th September 2011, 09:00 PM   #14
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Quote:
Originally Posted by SemperFi View Post
LC is the constructor of the OP's amp. Think its Lars Clausen or something Danish like that.
Appologize from me. Now I see LC refers to L.H. Clausen.
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Old 25th September 2011, 10:06 PM   #15
forr is offline forr  France
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Janneman
Things like the grounding layout, (remember, not all grounds are created equal!) or power supply decoupling, and supply routing probably have at least the same impact as the topology.


Not often said, not enough known !
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Old 26th September 2011, 06:13 AM   #16
Gudmund is offline Gudmund  Iceland
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Quote:
Originally Posted by jaycee View Post
Plenty of feedback, just not the usual type. Looks like current rather than voltage feedback. Why on earth would you choose to use crap like the TIP41/42 as drivers to 2SC3281/2SA1302's...
A little research showed that faster drivers in the mkII version could make the circuit unstable.
It seems that L.H.Clausen changed drivers as well as o/p transistors in the mk3 version, which I found at the same site.

As to your statement concerning 3281/1302, the mentioned powertransistors has been used more than once, and messured linearity of the Toshiba's equals the types that you suggest.
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Old 26th September 2011, 07:01 AM   #17
Gudmund is offline Gudmund  Iceland
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Quote:
Originally Posted by Gudmund View Post
A little research showed that faster drivers in the mkII version could make the circuit unstable.
It seems that L.H.Clausen changed drivers as well as o/p transistors in the mk3 version, which I found at the same site.

As to your statement concerning 3281/1302, the mentioned powertransistors has been used more than once, and messured linearity of the Toshiba's equals the types that you suggest.
Sorry ....was suggested by Lacy Cat !
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Old 26th September 2011, 09:20 AM   #18
jez is offline jez  United Kingdom
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Quote:
Originally Posted by forr View Post
Janneman
Things like the grounding layout, (remember, not all grounds are created equal!) or power supply decoupling, and supply routing probably have at least the same impact as the topology.


Not often said, not enough known !
Totally agree! In fact I would say that they are FAR more important than the topology
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Old 26th September 2011, 09:57 AM   #19
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check out this thread:
Better Audio with or without NFB (Negative Feedback) - for me the wrong Question
also this threads and URLs perhaps are of interest:
URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage
TIP3055/2N3055 based power amps

Output Buffer Stages
Help with this amp (Harman's T-Circuit: Post #151)
Replacement transistors in Leach Superamp. Help needed!
Baxandall Super Pair (CFP, Sziklai-Darlington)
Edwin 20 watt (Elektor 1970 - May)
Quad 303 triple cascade
four transistor emitter follower (diamond buffer) as power output stage?
Best topology for no-feedback ClassAB buffer ?
Hot Follower 99
Power follower 99c Vs Zen
Jfet audio buffer
Anyone built this mosfet follower (or similar)?
Buffer Amp
Buffer Power amp.

Quasi complementary concepts
How to identify a quasi-complementary amplifier?
Brother of Quasi
Another quasi-complementary design
quasi-complementary output
http://www.diyaudio.com/forums/solid...begginers.html
Crazy Clipping Behavior Quasi Complementary MOSFET Citation 12 TAA Book
NMOS Amplifier 900
NMOS Amplifier
N-Channel mosfet amplifier schematic needed 106759
N-Channel mosfet amplifier schematic needed
Push-Pull using only N-Channel MOSFETs 5053
Push-Pull using only N-Channel MOSFETs
N-channel only output devices in a power follower. 7511
N-channel only output devices in a power follower.
N-channel Problem HELPPPPPP 7542
N-channel Problem HELPPPPPP
Improving the linearity of an N-ch MOSFET output stage
Power amp under development
Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power?
It's cheap, it's N, it's dirty, it's.... The CIRCLOMOS!!!
Black devil #47
Your opinion about this schematics?
Anybody have scan of AN-483B (Motorola)? (Black devil)
only N-Channel/NPN BjT's
http://www.diyaudio.com/forums/attac...amp=1137723117
von
has anyone heard of this? composite collector load.....
Siliconix & Siemens NMOS amplifiers
Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power? 1102
Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power?
Best topology for no-feedback ClassAB buffer ?

current-conveyors (CC) Jannemann PAX
current conveyors
LEF Carlos Candeias
how does a LEF (load effect free) amplifier work?

push-pull-push-und-push-pull-pull
Gamut D200 clone !!!
"Push-Pull" for push und "Push-Pull" for pull (like Gamnut) - whats the right name?

Parallel connected output devices
Using Many Small Signal Transistors Paralleled in place of one output Transistor
How to drive 8 pairs of MJL21193/94?
MOSFET Output
Improving the linearity of an N-ch MOSFET output stage 3524 Starter: X-PRO, Entwickler vom A3i
Improving the linearity of an N-ch MOSFET output stage
Best MOSFET for output stages (page 11, also circlotron)

Error Correction
Linx Nebula Schematic error correction amp
Bob Cordell Interview: Error Correction
Re: New error correction amp
New error correction amp.
Switch mode between Hawksford error correction and NFB by Unity Gain

MJR
new Renardson amp
MJR-7 Mosfet Amplifier of M. Renardson
What is the optimum -3db bandwidth for amplifiers with feedback ?

NDFL (nested feedback loops)
nested feedback loops
New Cherry NDFL amp

CFP gain stage, modifications.
CFP gain stage, modifications.
CFP und emittergekoppelte Differenzverstärker
CFP gain stage, modifications.
http://www.diyaudio.com/forums/showt...57#post1862357
CFP For The VAS

Cascode
What is the name of this topology? (emitter cascode)
Cascode topology for Power Output like STASIS - no longer used in today's amps; why?
My folded-cascode VAS linearity investigation
http://www.diyaudio.com/forums/attac...amp=1222759259 (folded cascode)
Input stage idea ((Rush Cascode for input)

IC-Amp
Death of Gain Clone
Chip Amp based on the topologies from Yamaha MX-10000 and Quad 405

Compensation capacitor Cdom
Compensation capacitor Cdom

SuSy
Texas Instruments licenses Pass patent (SuSy US 5376899 go to TI)
http://focus.ti.com/docs/prod/folder...t/opa1632.html (Nelson Pass SuSy US 5376899)
Four for SuSy? (Sansuis Diamond Transistor)
http://www.diyaudio.com/forums/showt...745#post687745
Bridged vs Conventional Amps
http://www.diyaudio.com/forums/attac...amp=1249756796

Technics Class-A versions
:: Audiotek 69 - [Technics SE-A1?] ::
http://www.diyaudio.com/forums/attac...amp=1070435722 Technics SE-A1, AA
http://www.diyaudio.com/forums/attac...amp=1070435794 Technics SE-A1, AA
http://www.diyaudio.com/forums/attac...amp=1070435872 Technics SE-A1, AA
New-Class-A ? (whats it mean)
New-Class-A ? (whats it mean) (New Class A)
http://www.geocities.com/technicshifi/SVI2004A.JPG (SVI2004A)
http://www.diyaudio.com/forums/attac...amp=1082105786 (SVI2004A inside)
http://www.diyaudio.com/forums/attac...amp=1231499564 (TechnicsOutput BUF)
Technics Class A Bias Circuits

Class XD
Class XD....
class XD - Doug Self is at it again
Class XD.... (Diskussion)
class XD - Doug Self is at it again (Diskussion, Quelle für URL)

Class-B w-o-crossover-distortion
Crossover distortion - be gone!
Class B w/o crossover distortion (1975) (Visch Topology)
New Class A, Super-A, Non-Switching : need a revival ?

Class G, H
High Power Class G amplifier
NFB
Looking for Feedback on this No Feedback Amp
Looking for Feedback on this No Feedback Amp.
http://www.diyaudio.com/forums/showt...60#post1838160
Bob Cordell Interview: Negative Feedback
Zero Feedback Impedance Amplifiers
Evolve Non Global Feedback Distortion Cancellation Power Amplifier

Auto-Bias, variable Bias
Variable operating biass output ?
Ultimate ECC for Class B from Thule Audio? Topology also used by Teac
http://www.diyaudio.com/forums/showt...12#post1679112 (Optobias US4752745)
Dynamic Bias - Active Bias - Automatic/Self biased - Overview wanted
"An Adjustment-Free Complementary Power Amplifier" by J.Diamond
Any new design sliding bias amps out there ?
Biasing schemes for bipolar transistor circlotrons

Out = GND
Hafner/QSC
qsc topology, but without opamp?

Preamp, Equalizer
Make A Good Pre-amplifier???
Make A Good Pre-amplifier???
Baxandall tone control circuit

Voltage Regulator
Bipolar discrete shunt regulators
Bipolar discrete shunt regulators
Bob Cordell Interview: Power Supplies
Various
That curious extra knob, or: "Trans-Amp"
N.Sano, T.Hayashi, H.Ogawa,"A high-efficiency class-A audio amplifier", AES preprint
Best MOSFET for output stages
BridgeClone with current-dumping circlotron afterburner :-)
Pictures of your diy Pass amplifier
old transistor data
Collection of Class B topologies <100mA Idle and Sound closest by Class A
Your opinion about this schematics? (Black devil Nytech couple capacitor to loudspeaker)
Help with diff Amp current balance
Pass "DeLite" Amp from BAF
Could this ever be functionnal
Class A - Inherent disadvantages ?
Best MOSFET for output stages
John Curl's Blowtorch preamplifier part II 1.184.524
John Curl's Blowtorch preamplifier part II
Crescendo Elektor 63
http://www.diyaudio.com/forums/showthread.php?t=148227
Ebay 15W class-a zero feedback modules? 241
Ebay 15W class-a zero feedback modules?
First time solid amp 226
First time solid amp
Beast with a Thousand JFETs 13048
Beast with a Thousand JFETs
Class A push-pull 760
Class A push-pull
IGBT amplifiers
Luxman L58A / 2SK163-2SJ44?
(Clausen's Millenium Amp "The End")
How to identify a quasi-complementary amplifier?
REAL AMP (what is the best Amp for big that torodial transformer)
Crescendo Millennium offset problem
Threshold amps DC Protected (post #13 universal DC protect methody)
BF862 Preamp
VSOP-Amp
VSOP amp

Last edited by tiefbassuebertr; 26th September 2011 at 10:26 AM.
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Old 26th September 2011, 11:25 AM   #20
knutn is offline knutn  Norway
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So now Gudmund, you have something to do to next summer!
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