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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 31st May 2019, 06:26 AM   #51
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by Elvee View Post
...avoid injecting ripple into the speaker...A hybrid solution is not going to work very well, and will require extra complication, or a super-clean supply, none of which is desirable.
Item #1, ripple: At post#36, member anti suggested a 36v smps. This hits the center of the application range (better than I did). So, I have transmitted a 5a 36vdc smps to your location via a combination of, possibly sea turtles and horses. Well, the shipping was free and some of it might not involve petrol.
Ripple? Damn the torpedos! Full speed ahead!

Item#2: As for the audiophile job to get done, it has costs. Right-on that it is necessary that costs for large signal shouldn't be done at small signal locale. Excellent! Also, I was thinking that some odd 220u shunt cap at small-signal/amplification locale after a resistor/transistor/diode series element?
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Old 31st May 2019, 12:57 PM   #52
anti is offline anti  Slovakia
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With a 36V supply, and an amp that has good output swing, you can expect around 30W@4R, 20W@6R and 15W@8R rms output.
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Old 31st May 2019, 07:32 PM   #53
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by danielwritesbac View Post
So, I have transmitted a 5a 36vdc smps to your location via a combination of, possibly sea turtles and horses. Well, the shipping was free and some of it might not involve petrol.
Ripple? Damn the torpedos! Full speed ahead!
That's very kind of you Daniel, but really you should have asked before sending anything: I already have all the good quality test-supplies required for any situation, and in addition, I do not even need to make a physical test to know that it is going to work; in fact, even a sim is superfluous in this case.
It will work no matter, and the result will depend only on the supply's quality.
Thanks anyway, and it will be an opportunity to test the quality of a commonly available supply.

Quote:
Item#2: As for the audiophile job to get done, it has costs. Right-on that it is necessary that costs for large signal shouldn't be done at small signal locale. Excellent! Also, I was thinking that some odd 220u shunt cap at small-signal/amplification locale after a resistor/transistor/diode series element?
Most really good, performing solutions do not require a large investment money-wise, just good principles and practices.
Some do however, and one should be able to recognize when penny-pinching is not an option.

Could you provide a sketch of your shunt cap idea?
I am not quite able to visualize it
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Old 1st June 2019, 07:41 PM   #54
danielwritesbac is offline danielwritesbac  United States
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Oh, I had sent the supply because it is similar to what runs the working auto-center-power examples; and, also generally likely to be utilized. It was barely lunch-price and the real output is much better representation than virtualized media (photos, words). Caveat of a high efficiency production SMPS is that the filtering tends to catch some large signal audio too. . . or similar problem that I could not describe.

and,

Small signal power on the Honey Badger has the cap. In that case, resistor vs cap. I think it is there so that small signal doesn't get a rough ride when the big amp pushes a hundred watts to a speaker. Also, if a zener is added parallel to the cap, there's minimal parts count stabilized front end power. diyAB Amp The "Honey Badger" build thread R32, C11. Looks simple, except that I don't know best spot to install it.
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Old 2nd June 2019, 04:10 PM   #55
Elvee is offline Elvee  Belgium
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R12 and C8 play a similar role in the EZmos
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Old 12th June 2019, 06:16 AM   #56
danielwritesbac is offline danielwritesbac  United States
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Quote:
Originally Posted by gannaji View Post
Can this circuit be upgraded to +50 Volts operation ?
Power ever increasing incrementally till infinity, or some form of overage management such as auto-center, baker clamps, etc? Well, ever increasing power is sure to result in impractical output; so, we need to have a closer look at overage management, carefully bearing in mind that the alternative has much worse costs.
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Old 12th June 2019, 05:00 PM   #57
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by gannaji View Post
Can this circuit be upgraded to +50 Volts operation ?
Yes, if you need a higher output power and/or a higher load impedance.

If you use suitably rated capacitors and semi's, no problem at all.

With the latest version (with the additional input transistor), it is the only thing you need to keep an eye on.
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Old 19th June 2019, 05:23 AM   #58
danielwritesbac is offline danielwritesbac  United States
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I may have been misspoken (not intentionally). And a bit unfamiliar with fets. Had it been a BJT small scale (no drivers) amplifier that got a push-for-power request, I'd have a question about which low-cob toshi-specs driver or really stout CRT device to use for vas--some sort of have your cake and eat it too, performing device (which are few but do exist). But, as for fets, I've no idea.

@Elvee
Rather than laborious voltage increments, I did imagine one idea:
How far + is a missing reference point. So, what fet and outputs and voltage should be used for an up-sized not-so-EZmos? The device specs. Discontinued devices are OK for that example; but, what is important is the device specs necessary to achieve it. How far does it go before the performance droops or drivers needed; and, what does that line-in-the-sand example look like, if tamed for practical using? Well, I think that this is less laborious than sneaking up on it, incrementally.
It was supposed to be small/indoor scale; however, the high-low boundaries--nobody asked for the low side; but it seems necessary to document specs for the high side. Indeed, how does that go?

A possibly defined boundary may be at the output, since a highly competent diy edition of a husky/cheeseburger bookshelf speaker may resist cone breakup noises up to 68 Watts on measure. Those are rare, but it can be done. However, how much can the small scale style of FET amplifier do without performance droop or need of drivers? There's no need of that much indoors, in a house; however, there is need of a ceiling and what is it?
Of course 8W will do; but, when you've got a curiosity about how much (not past 68), then how much is it?
8 though 68, I think is a terrible question; but, I think that it is better than increments.
So much as 68 is neither requested nor desired; but, I'd like to know where the reasonable ceiling is? Perhaps the amplifier specs can reveal it?
I'd like to put in a request for less than 68W if small scale (small venue) purpose, indoors. Even half that much is overage for a fair speaker in a house. So, then the capacity, and the device specs to achieve it....

P.S.
To me, this looks like "the hard way" for overage management. I do not recommend the brinkmanship.
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Old 19th June 2019, 05:59 AM   #59
danielwritesbac is offline danielwritesbac  United States
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Diyaudio thought I could make sense in 30 minutes? Fail!
Anyway, if going without the costs of brinkmanship, then what does the + biggie size no-so-ezmos amplifier look like and what are the device specs to achieve it?
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Old 19th June 2019, 08:05 AM   #60
gannaji is offline gannaji  India
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Dear LV & Daniel,
My thinking is that +50 Volts DC is convenient, the main capacitors can be 63 Volts rating. The output can be 16 V giving a nice ~30 watts output to 8 ohms. This level of output can be quite adequate for some.
SMPSs of 48 Volts rating are available.
If the voltage goes higher, we have to use higher voltage rated Elcos which are not easy to source everywhere.
--gannaji
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