POWER AMPLIFIERS

thank u, i am new to this group ,i would like to know about this topic.if u know any references please forward .

as discussed earlier we use transformer in place of resistor to improve efficiency.the other additional advantage is impedance matching . impedance matching can be achieved because the transformer has primary and secondary windings .by adjusting the values of the resistors placed at input and output say R and R1 the ratio of windings can be achieved as it depends on the following relation,i.e R=R1(N\\N1). where N and N1 are primary and secondary windings. disadvantage a)the output signal is distorted as id contains

---Rest of self serving lecture snipped-----

For want of a better term, you are full of Excrement of Male Bovine (EoMB, as suitable acronym).

With credits and apologies to Tim Bray as original author of the term.

Perhaps your pixel persona might better be techdoh.

Cheers

PeteS

Interestingly, this looks suspiciously like a Q&A session from a basics book ;)

Cheers

PeteS

Just go BUY one you like and have a Merry Christmas. GG

Oh please do. We don't get unsolicited lectures very often. ;-)

sorry, it was the basic knowledge wat i had in this topic .may be it was like ques and answer section but i felt that it can be disscussed better only this way,if any more idea please suggest.thank u.

Transformer coupled amplifiers at audio frequencies are obsolete.

Bridge-tied amplifiers are worth looking at as are Class D amplifiers, if you are after the best efficiency possible.

If you are into linear stuff, the Class AB types with heavy negative feedback and current limiting are good.

Nope; a "power amplifier" is either (a) an amplifier which is used to obtain a significant gain in power, output vs. input or (b) more colloquially, the output stage of a circuit, intended to deliver significant power into the load. Amplifiers are not classed by the type of devices from which they are constructed. (I take it the finals at our old college radio station wouldn't have been considered "power amplifiers" per the above, since they used tubes rather than "power transistors"? :-))

Nope; AB is more than 180 BUT LESS THAN 360; you can't forget that final qualifier. And actually, the above classifications are not, strictly speaking, limited to "power" amplifiers (although they'd most often be seen in that context.

Why would you think that only Class A amps can be distinguished in this manner?

With what, Einstein?

The goal of any amplifier (esp. all Class As), not a distinguishing characteristic.

That max. efficiency is generic to Class As, too.

OK - but find a better book to swipe your material from first.

Bob M.