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Lateral CFA 120W - BSA
Lateral CFA 120W - BSA
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Old 7th June 2019, 12:34 PM   #11
gannaji is offline gannaji  India
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"But surprising to me is, my amp has better thd 1kHz AND 20kHz (at lower power, due to 36v supply), so I'm not quite sure if the 20kHz loop gain plays an important rule here?"
Dear johnego,
Would you mind sharing more details about your amp like schematic ?
gannaji.
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Old 7th June 2019, 12:59 PM   #12
johnego is offline johnego  Indonesia
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Quote:
Originally Posted by gannaji View Post
Dear johnego,
Would you mind sharing more details about your amp like schematic ?
gannaji.
I'm sorry, gannaji, I'm not ready to share my findings in audio especially amplifier design, which can be seen from my amps.
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Old 7th June 2019, 03:38 PM   #13
jacques antoine is offline jacques antoine  France
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Lateral CFA 120W - BSA
Quote:
Originally Posted by johnego View Post
I'm not ready to share my findings in audio especially amplifier design, which can be seen from my amps.
Hi Johnego,

May I ask what you have discovered so far ?

Jacques
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Old 7th June 2019, 05:05 PM   #14
bullittstang is offline bullittstang  United States
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Lateral CFA 120W - BSA
Default Lateral CFA 120W - BSA

Very interesting and tempting design.

Check your silkscreen, you have Q9 and Q5 at the same location with the actual Q5 marked elsewhere on the board. Again, very cool design, any chance you would provide some gerber files? Thanks

Edit: Totally missed you provided gerbers already - awesome and thanks!
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Old 7th June 2019, 08:24 PM   #15
dadod is offline dadod  Croatia
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Quote:
Originally Posted by bullittstang View Post
Very interesting and tempting design.

Check your silkscreen, you have Q9 and Q5 at the same location with the actual Q5 marked elsewhere on the board. Again, very cool design, any chance you would provide some gerber files? Thanks

Edit: Totally missed you provided gerbers already - awesome and thanks!
Thanks, it slipped me, but not big error, just that one is Q9.

Yes the gerbers are for anyone to use, just not for commercial.
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Old 8th June 2019, 05:47 AM   #16
gannaji is offline gannaji  India
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Quote:
Originally Posted by johnego View Post
I'm sorry, gannaji, I'm not ready to share my findings in audio especially amplifier design, which can be seen from my amps.

At least, will you kindly desist from making comparisons to your amps, whose details are not available ? Else, no meaningful discussion can take place.
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Last edited by gannaji; 8th June 2019 at 05:56 AM. Reason: spelling
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Old 8th June 2019, 06:04 AM   #17
johnego is offline johnego  Indonesia
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Quote:
Originally Posted by jacques antoine View Post
Hi Johnego,

May I ask what you have discovered so far ?

Jacques
Hi Jacques,
I'll try to answer you without polluting this thread. Please don't ask any detail

Many don't realize that electronics and audio is not the same entity. They have unconsciously assumed that whatever good electronically is good also for the sound. What i have been doing is correlating numbers with perceived sound, which to some extent, everybody do, i specifically do it in amp design, while searching for the best sounding amp, starting with one for each 'topology'. Easier for me because my ear is very sensitive.

In the process, I normally have built 'thresholds' for some parameters. I have also found my own practical methodology or design processes. It takes time to do this but i have done it everyday for so many years.

This is i believe similar to what AKSA did. He approved this new amp by Dadod but i believe not so with the 200W one. AKSA liked the resistor current source for the input, i think because this create the good sounding distortion spectrum, which is my favorite too. But i used ccs because (1) PSRR is rather insufficient (2) i assume the very low distortion might hide the effect of the slightly better distortion spectrum. But of course, i WILL try and compare, and this will add to my findings. But the biggest finding, i will not talk about it.
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Old 8th June 2019, 06:09 AM   #18
johnego is offline johnego  Indonesia
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Quote:
Originally Posted by gannaji View Post
At least, will you kindly desist from making comparisons to your amps, whose details are not available ? Else, no meaningful discussion can take place.
You forget that some people with knowledge can read from less detail. I can show a schematic for example, and it is of no use to some because it will sound bad when hfe is below 500 but will sound good as i want it when hfe is above 700.
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Old 8th June 2019, 08:12 AM   #19
dadod is offline dadod  Croatia
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This is PSRR, not so bad.
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File Type: jpg 120W-LMOSFET-VAS-OITPC-simple-PSRR.jpg (198.1 KB, 412 views)
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Old 8th June 2019, 08:49 AM   #20
bambadoo is offline bambadoo  Norway
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Very good. Very suiteable for smps.80khz switching perhaps and almost 100dB down.

Last edited by bambadoo; 8th June 2019 at 09:10 AM.
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