push pull power amp.

[ajays2539]

what are advantage and disadvantage, if we built push pull transformer couled amp with mosfet instead of bjt .

 

[chuckey]

Why would you use a transformer? no one else does! A complementary pair of FET output transistors, potentially produce the lowest distortion, but this is down to the complete amplifier design. Junction transistors can provide low distortion any way (.01%), which is low enough for most purposes.
Frank

 

[ajays2539]

Why would you use a transformer? no one else does! A complementary pair of FET output transistors, potentially produce the lowest distortion, but this is down to the complete amplifier design. Junction transistors can provide low distortion any way (.01%), which is low enough for most purposes.
Frank

transformer will be used , to match impedance with load ....and in input side to provide split equal and opposite polarity voltage to both transistors ...

 

[Audioguru]

Audio amplifiers have not used an output transformer for at least 50 years. A transformer was used to match the high output impedance of vacuum tubes to the low impedance of a speaker.

A modern audio amplifier has an extremely low output impedance so it is a voltage source that drives a speaker directly. The output transistors are complimentary emitter-followers so they do not need the input split with opposite polarities.

Here is a simple low power audio amplifier:

 

[ALERTLINKS]

Output transformers are still used widely here, especially in PA amplifiers operating from 12V.

 

[BradtheRad]

what are advantage and disadvantage, if we built push pull transformer couled amp with mosfet instead of bjt .

Mosfets are voltage controlled.

It is particularly important that the power supply V be well regulated.

 

[Audioguru]

Output transformers are still used widely here, especially in PA amplifiers operating from 12V.

Why would a PA amplifier be powered from only 12V like a car radio?
When I worked with sound systems, an amplifier produced 70V RMS without an output transformer. Then every speaker had a stepdown transformer.
70V RMS is 613W into 8 ohms.