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First One - mosfet amplifier module
First One - mosfet amplifier module
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Old 13th May 2016, 08:55 AM   #2931
Lazy Cat is online now Lazy Cat  Slovenia
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Quote:
Originally Posted by BYRTT View Post
You tested bridged version and it got the stamp approved .... also like you intend match output devices for L-version with new bench tool think that is serious good policy.
Agree about serious approach to the strongest of the First Ones, only PCB design took me few months, no shortcuts were taken..
For example, there are no source resistors, not needed actually but still you get almost ideal Id tracking from paralleled devices from zero to Id max, that have positively surprised me, how good these lateral mosfets really are. First four L modules will be tested in depth before ordering a series..
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Old 13th May 2016, 09:37 AM   #2932
Theodosis O. is offline Theodosis O.  Greece
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Quote:
Originally Posted by Lazy Cat View Post
.... there are no source resistors, not needed actually but still you get almost ideal Id tracking from paralleled devices from zero to Id max, that have positively surprised me, how good these lateral mosfets really are...
Great news Andrej. Congrats !!!
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Old 13th May 2016, 10:32 AM   #2933
back is offline back  Greece
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LC i have a couple of pm's from members with a single 1.2 version left.
Does it matter if it is green or red pcb?
mine are green.
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Old 13th May 2016, 10:33 AM   #2934
aradan is offline aradan  Singapore
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The 1.2 is green

Sent from my ONE A2003 using Tapatalk
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Old 13th May 2016, 01:32 PM   #2935
back is offline back  Greece
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Originally Posted by aradan View Post
The 1.2 is green

Sent from my ONE A2003 using Tapatalk
seems like there are both green and red 1.2s
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Old 13th May 2016, 01:37 PM   #2936
aradan is offline aradan  Singapore
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I thought reds are 1.3 and 1.4

Sent from my ONE A2003 using Tapatalk
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Old 13th May 2016, 06:01 PM   #2937
Xerxes75 is offline Xerxes75  Netherlands
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To end the confusion....

The picture is not very good but you see a Red V1.2 Module...

R.
Attached Images
File Type: jpg IMG_6613.jpg (511.0 KB, 413 views)
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Old 13th May 2016, 06:22 PM   #2938
pinnocchio is offline pinnocchio  Canada
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Hi LC,

Are you planning new revs of S and M using fully balanced differential topology like the L version?

Thanks
Do
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Old 14th May 2016, 02:44 PM   #2939
Lazy Cat is online now Lazy Cat  Slovenia
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Quote:
Originally Posted by back View Post
LC i have a couple of pm's from members with a single 1.2 version left.
Does it matter if it is green or red pcb?
mine are green.
Quote:
Originally Posted by aradan View Post
The 1.2 is green
Quote:
Originally Posted by Xerxes75 View Post
To end the confusion....

The picture is not very good but you see a Red V1.2 Module...

R.
At start FO v1.2 were green in second batch we made them red since that was a PCB design of our future amps like FO M and L
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Old 14th May 2016, 03:07 PM   #2940
Lazy Cat is online now Lazy Cat  Slovenia
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Lightbulb Fully balanced First One

Quote:
Originally Posted by pinnocchio View Post
Hi LC,

Are you planning new revs of S and M using fully balanced differential topology like the L version?

Thanks
Do
Hi Do

No worries, all First One modules will stay unbalanced input as till now. With fully balanced topology, the concept is to preserve original differential signal from the source not to make new subtraction in FO amp's front-end, it is meaningless even wrong to do that. Once the signal is differential, high Z from GND, there's no reason to differentiate it again and again every time in every unit in the signal path, for me that is wrong since it introduces new distortions and subtraction deviates unnecessarily.

My point is to make balanced amplifier which amplify both phases of the signal independently and summ them at the speaker itself. Pic below explains it well (thanks BYRTT).

BTW how's your FO v1.4 M advancing towards finish?

L.C.
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File Type: png Fully balanced amplifier.png (4.4 KB, 343 views)
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