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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old 8th December 2019, 05:49 AM   #31541
Tournesol is online now Tournesol  Belgium
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Quote:
Originally Posted by syn08 View Post
Definitely none of your business.
Just explain-me how the soldering iron of another contributor is YOUR business ?
And why are you always so aggressive, contemptuous and pretentious?
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Originally Posted by syn08 View Post
Please show your soldering tools on the workbench and I’ll consider it. Copy/paste is not allowed.
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Last edited by Tournesol; 8th December 2019 at 05:59 AM.
 
Old 8th December 2019, 06:08 AM   #31542
bimo is offline bimo  Indonesia
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I really do not care about amplifier topology. I want to design amplifier using topology that I knew. Make them as best as I can. It is about DIY audio. If you think all amplifiers sound same, it is likely you do not belong to this forum.

Several member can design CFA amplifier with very low THD, high slew rate, etc. Why the other jealous? Because they can not?
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#Perkutut#Emprit#GagakHitam#Elang#Pelatuk#Colibri# Blameless100#Blameless150#Blameless1200#AX14Mod#FX 8Mod#AX11Mod#LM1875InvertingWithBuffer#LM3886Inter tingWithBufferAndDCServo#more...
 
Old 8th December 2019, 06:18 AM   #31543
dadod is offline dadod  Croatia
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Originally Posted by scott wurcer View Post
I know that, you called the first version CFA. I have seen no current mode only PA's posted here, by the strict definition. Amplifiers using open-loop current transfer into a known load are well known, please show me an audio PA made that way. Not simply something like a current mirror with gain inside a normal amplifier.

These little or no feedback circuits don't come with -120dB THD's everyone seems to love. You can't have both.

Mr. Marsh likes to read abstracts, analysis of the contents would be more revealing.
Here is simulated only, non global NFB PA using a current conveyor as the gain block and EC OPS. Never built.
GainWire-NGNFB-classB-PowerAmp
Damir
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File Type: jpg GainWire-ClassB- betterCCS-EC-TT-noGNFB-15V-DCservo-sch.jpg (157.4 KB, 199 views)

Last edited by dadod; 8th December 2019 at 06:30 AM.
 
Old 8th December 2019, 06:40 AM   #31544
dadod is offline dadod  Croatia
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Originally Posted by scott wurcer View Post
Case in point he's been carrying on for months about his design with Damir a good guy and very nice competent designs, but they are CFA's not open-loop current transfer amps with error corrected output followers.
Thanks Scott, I never received nicer compliment and yet from best professional
electronic designer I know.
Damir
 
Old 8th December 2019, 06:45 AM   #31545
Tournesol is online now Tournesol  Belgium
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Never built.
Too sad, Damir. Why did you abandon this project?* Power Amps without negative global feedback are not legion. It was an occasion to verify the validity of the "GNFB is bad" legend.

* (I can understand, we cannot be everywhere and building amps is more difficult with age. ;-)
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Old 8th December 2019, 07:05 AM   #31546
RNMarsh is offline RNMarsh  Thailand
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Quote:
Originally Posted by dadod View Post
Here is simulated only, non global NFB PA using a current conveyor as the gain block and EC OPS. Never built.
GainWire-NGNFB-classB-PowerAmp
Damir
Lets prototype and later build that one also. We can compare with Scotts CFB or even a CMA.


THx-RNMarsh
 
Old 8th December 2019, 07:16 AM   #31547
PMA is offline PMA  Europe
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Why not your facility in Thailand to prototype it, if you want to make a business with it in the end?
 
Old 8th December 2019, 07:32 AM   #31548
TNT is online now TNT  Sweden
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Originally Posted by Tournesol View Post
Who do-you think you are ?
LOL!

//
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Old 8th December 2019, 07:50 AM   #31549
Max Headroom is offline Max Headroom  Australia
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Originally Posted by PMA View Post
Why not your facility in Thailand to prototype it, if you want to make a business with it in the end?
You must be late to the party lol, that has been well suggested already.
 
Old 8th December 2019, 08:22 AM   #31550
PMA is offline PMA  Europe
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You must be late to the party lol, that has been well suggested already.
Yes I am, my apologies then
 

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