A Class-G Amp if you want.

[Johannah Aleksandria]

Build na para matuto.
With the help of our masters here.

[Mayalin22]

o may bago na naman... musta na yong 50 watts mo? sususnod Class H na 

ano ba specialty ng Class G

[Johannah Aleksandria]

o may bago na naman... musta na yong 50 watts mo? sususnod Class H na 

ano ba specialty ng Class G

Ano pa nga ba ang Class H sa Class G?

[???]

o may bago na naman... musta na yong 50 watts mo? sususnod Class H na 

ano ba specialty ng Class G

Meron yata hi ang lo supply kapag kailangan ng hibo nakawait mode lang kapag di kailangan lobo lang.

[Johannah Aleksandria]

Meron yata hi ang lo supply kapag kailangan ng hibo nakawait mode lang kapag di kailangan lobo lang.

Class H uses mosfet on the high voltage while this G can be seen only as class B with same high and low voltage switching.

[rdpzycho]

from Wikipedia:


There are a variety of amplifier designs that enhance class-AB output stages with more efficient techniques to achieve greater efficiencies with low distortion. These designs are common in large audio amplifiers since the heatsinks and power transformers would be prohibitively large (and costly) without the efficiency increases. The terms "class G" and "class H" are used interchangeably to refer to different designs, varying in definition from one manufacturer or paper to another.

Class-G amplifiers (which use "rail switching" to decrease power consumption and increase efficiency) are more efficient than class-AB amplifiers. These amplifiers provide several power rails at different voltages and switch between them as the signal output approaches each level. Thus, the amplifier increases efficiency by reducing the wasted power at the output transistors. Class-G amplifiers are more efficient than class AB but less efficient when compared to class D, without the negative EMI effects of class D.

Class-H amplifiers take the idea of class G one step further creating an infinitely variable supply rail. This is done by modulating the supply rails so that the rails are only a few volts larger than the output signal at any given time. The output stage operates at its maximum efficiency all the time. Switched-mode power supplies can be used to create the tracking rails. Significant efficiency gains can be achieved but with the drawback of more complicated supply design and reduced THD performance.
The voltage signal shown is thus a larger version of the input, but has been changed in sign (inverted) by the amplification. Other arrangements of amplifying device are possible, but that given (that is, common emitter, common source or common cathode) is the easiest to understand and employ in practice. If the amplifying element is linear, then the output will be faithful copy of the input, only larger and inverted. In practice, transistors are not linear, and the output will only approximate the input. Non-linearity from any of several sources is the origin of distortion within an amplifier. Which class of amplifier (A, B, AB or C) depends on how the amplifying device is biased — in the diagrams the bias circuits are omitted for clarity.
Any real amplifier is an imperfect realization of an ideal amplifier. One important limitation of a real amplifier is that the output it can generate is ultimately limited by the power available from the power supply. An amplifier will saturate and clip the output if the input signal becomes too large for the amplifier to reproduce or if operational limits for a device are exceeded.

[labgruppen]

sir, i think wikipedia's and some other sites' definitions are mixed-up and actually the other way around.  pro-audio class-H amps are actually rail-switched (discrete rail-steps) while class-G is linear tracking supplies.  pro-audio manufacturers tag their rail-switched amps as class-H amps.  it is quite confusing, actually. lot's of sites agree with wikipedia's definitions, but established manufacturers mark their products in the opposite way.

Class H uses mosfet on the high voltage while this G can be seen only as class B with same high and low voltage switching.

Class-H and class-G only refers to the manner of varying the voltage of the rails. Class-H have discrete steps on the rail voltage dictated by the actual number and voltages of the rails,  while class-G is has a continuously variable rail voltage that is between the two volatges of the rails.  In automotive analogy, it's like an ordinary transmission (class-H) with fixed number of "gear ratios" and a CVT transmission (class-G) that has a fixed "first gear"  ratio and a continuously variable ratio between first gear and second gear.  Class-H and class-G classifications DOES NOT dictate the type of rail-switching element used (mosfet, bjt, igbt).  i've seen class-H amps using BJT rail-switches (i think K10 is one) and some class-G amps using mosfets as rails series pass elements. (iirc, some crest-audio amps use LOTS of mosfets in class-G).
I do not know what the classification is, but some lab.gruppen amps actually use a variable smps to supply the output rails.  The variable smps adjusts its voltage at the audio rate.  It is like a class-D amp supplying the output rails of a class-AB amp.  This way, they retain the sonic qualities of class-AB amp but have an efficiency approaching that of a class-D amp.

[tony]

i haven't dipped my feet into classG nor H, since i am into high fidelity, not public address.....
Class G and H are better suited to pro amps/PA duties simply because they are more efficient than classAB.....
you may also like to see Bob Carver's swicthing amps.....

why the obsession with power, i do not know.....power is not everything.....

[tony]

Build na para matuto.

oo nga, para matutong mag-build.....

[Johannah Aleksandria]

why the obsession with power, i do not know.....power is not everything.....
[/quote]

We have serve a Talent's Night just yesterday and although I think we serve them best, there is one who said the sound was good but have not enough power.
I accept because we were just using 150W amps while some other groups used the way of K4 and K6 of Konzert.

[Johannah Aleksandria]

Class-H is once more basically Class-B, but with a method of dynamically boosting the single
supply rail (as opposed to switching to another one) in order to increase effi ciency [12] . The usual
mechanism is a form of bootstrapping. Class-H is occasionally used to describe Class-G as above;
this sort of confusion we can do without.

A definition by Douglas.
He never elaborated Class-H, in fact he never had examples for it. But he talked a lot about Class-G.

[RaffT]

@ jo

madami yang mga ampli sa googel...  gawa kana at ipost mo dito

antay kami ah

 

[Johannah Aleksandria]

@ jo

madami yang mga ampli sa googel...  gawa kana at ipost mo dito

antay kami ah

 

Mdami nga, cge hintay kayo.
Hentai-hentai lang muna kayo.

[j a y k e z]

patambay po at ng matuto XD

[Tripler02]

sub

[Johannah Aleksandria]

i haven't dipped my feet into classG nor H, since i am into high fidelity, not public address.....

Ito nga sana ang gusto kong ipahiwatig sa iba rito sir eh, yung tularan ka.
Mayroong specialty.
Makikita nman di ba? pagdating sa tube at Class-A, hinigop mo lahat ng customer. Pati na rito sa mga kapwa ka-elab.

[Mayalin22]

^ eh bakit kung ano-anong class ini-introduce mo  hehehehe 

[Mayalin22]

opps double 

[Woots29]

tsk tsk tsk

[Mayalin22]

^cguro naman hindi lahat ng sinabing maganda gagawin ng mga elabers  

gaya ko 10 pesos a day lang ang budget sa hobby