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Easy-MOS is a simplistic, efficient and evolutive all-MOS amplifier for beginners
Easy-MOS is a simplistic, efficient and evolutive all-MOS amplifier for beginners
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Old 8th May 2019, 03:49 PM   #31
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by kokoriantz View Post
...and use floating single supply as sublimed JLH1969
Yay!!! Single rail version of, Auto-center power!
If compatible with the amplifier, it should result in Reduced distortion at high output, especially in the case of music signal (which is variably asymmetric).

This little dynamic headroom enhancement is much better quality than a mild soft clipper could do. Also costs slightly more for split tank capacitance, and that's okay. But then the question is: Is there simply no change, or is it compatible with the amp (shows benefit)?
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Old 8th May 2019, 10:35 PM   #32
kokoriantz is offline kokoriantz  Lebanon
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The input capacitor is also in the FB loop . The power supply receives a positive feedback which decreases considerably it's impedance. I tried it on Lm3886 , resulting much higher dynamics than split supply.
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Old 17th May 2019, 10:15 PM   #33
danielwritesbac is offline danielwritesbac  United States
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I wonder what sort of adaptation it would take to go non-inverting, for the purpose of supporting functions like 'partial current drive' and 'auto center power'?
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Old 19th May 2019, 08:42 AM   #34
Elvee is offline Elvee  Belgium
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The simplest method, by far, is to revert to the classical, singleton input topology, in the Old Fashioned style.
Here is an implementation example, based on the most basic version of EZmos (it can be applied to the more evolved variants too):

Easy-MOS is a simplistic, efficient and evolutive all-MOS amplifier for beginners-ezmosc0-png

It becomes self-centering for a wide supply range and C7 acts as an inverting input and can be tied to a current-sensing resistor to alter the output impedance.

Side benefits also include a lower THD level (0.025%) and a higher input impedance.
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File Type: png EZmosC0.png (92.1 KB, 572 views)
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File Type: asc nsoEZmos.asc (6.6 KB, 21 views)
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Old 20th May 2019, 06:16 AM   #35
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by Elvee View Post
...self-centering for a wide supply range and C7 acts as an inverting input and can be tied to a current-sensing resistor to alter the output impedance.
Side benefits also include a lower THD level (0.025%) and a higher input impedance.
I had to read the THD figure six times before it finally sank in how very low/good that is for a fet amp. Awesome. EasierMOS?

But, the SMPS isn't doing any favors, and exactly 30v isn't convenient. I've had some difficulty/fails in estimating the voltage until after the fact. But, it is pretty clear that there should be a transformer.
Most common is 24vac and second is 30vac.

On weighting the factors, it comes up heavily in favor of the 30vac transformer as the power source (44vdc, or approximately 42vdc average if using).

This idea is tall and bumping into the spendy capacitor/tv room area, but didn't cross the line. So, it is still in scope. It seems a good plan that the biggest which is still in scope can 'fix' the voltage so that you'll have fixed target.

The question is, does it scale to 42vdc easily, and how does the THD estimate if auto-center power is also on the simulator schematic?

If that was a good idea, then indeed they are fixed targets.
The following question would be hookup points for partial current drive accessory, like 'x' marks the spot.

If that was all a 'go' then it is very low parts count for maximized audio functionality. It would be the first to formalize that at doable cost.
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Old 20th May 2019, 09:54 AM   #36
anti is offline anti  Slovakia
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You can get 36V smps bricks.
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Old 20th May 2019, 03:24 PM   #37
danielwritesbac is offline danielwritesbac  United States
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If a span is permissible, 35vdc to 43vdc would be conveniently close to commonplace power supplies.
But, I was wondering if that would involve some value differences and/or a few higher wattage resistors?
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Old 20th May 2019, 03:37 PM   #38
Bonsai is offline Bonsai  Europe
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Very cool design Elvee!
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Old 20th May 2019, 08:06 PM   #39
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by Bonsai View Post
Very cool design Elvee!
Thanks!

Quote:
Originally Posted by danielwritesbac View Post
But, the SMPS isn't doing any favors, and exactly 30v isn't convenient. I've had some difficulty/fails in estimating the voltage until after the fact. But, it is pretty clear that there should be a transformer.
Most common is 24vac and second is 30vac.

On weighting the factors, it comes up heavily in favor of the 30vac transformer as the power source (44vdc, or approximately 42vdc average if using).

This idea is tall and bumping into the spendy capacitor/tv room area, but didn't cross the line. So, it is still in scope. It seems a good plan that the biggest which is still in scope can 'fix' the voltage so that you'll have fixed target.

The question is, does it scale to 42vdc easily, and how does the THD estimate if auto-center power is also on the simulator schematic?
With this version, you are free to use whatever supply voltage you want (within reason, of course), if you use suitable semi's.
The OP power (and dissipated power) will be proportional to the squared supply voltage, as with any other amplifier.
The THD will remain in the same range, decreasing slightly with increasing voltage.

Quote:
If that was a good idea, then indeed they are fixed targets.
The following question would be hookup points for partial current drive accessory, like 'x' marks the spot.
I will post an example, when I find some time.

Quote:
If a span is permissible, 35vdc to 43vdc would be conveniently close to commonplace power supplies.
But, I was wondering if that would involve some value differences and/or a few higher wattage resistors?
In principle, from ~10V to 45V, you don't need to change anything.
If you go higher than 45V, the 470ohm resistors would need to be larger than 0.25W, and above 50V, the BS170 would need to be replaced by a device capable of dissipating more than 1W, but that's all that is required (minor adjustments in the Vgs multiplier and elsewhere might be beneficial)
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Old 21st May 2019, 05:38 PM   #40
danielwritesbac is offline danielwritesbac  United States
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Thanks! That's a lot of good news!

Attached: If I drew it right (not sure), the attachment has partial current drive.

I don't know how to hook that up correctly, together with auto center power (post32). They're both transparently mild; however, that combination of output functionality typically involves tubes/valves and a really flat wallet. So, it would be wonderful to do the job affordably solid state.
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File Type: jpg partialcurrentdrive.jpg (85.5 KB, 215 views)

Last edited by danielwritesbac; 21st May 2019 at 05:51 PM.
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