280 milliwatts amp

278

06:34:38

A class AB amp with a 9 volts supply at 8 ohms output load.  Power output is roughtly 280 milliwatts

published 8 years ago

ahmednabeelma20001

8 years ago

Why 2 diodes

crake

8 years ago

Replace them with a wire and then run the sim. You'll see why they're there

ahmednabeelma20001

8 years ago

So it have to do with that emmision coefficient

crake

8 years ago

Eh, I wouldn't think about it in those terms. Relplace them with a voltage source set to 1.4V this time. Then, while watching the waveform turn the voltage down to about half.

crake

8 years ago

like this: http://everycircuit.com/circuit/5396059533869056

crake

8 years ago

What you're seeing is called "crossover distortion". It happens when one device is starting to shutoff, and the other hasn't completely turned on. Putting a voltage of 1.4V in the correct location causes the "shutoff and turn on" point of both transistors to overlap a little.

rommelpm

8 years ago

usually it should be 4 silicon diodes or at least three diodes to supply enough bias to the output transistors, but it'll work even with a small crossover distortion specially for none critical simple applications. The circuit aims to be simple with less parts.

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