hey friends
i am building my first class A audio amplifier
i achieved the dc biasing step successfully
this is my circuit:

the problem is when i connect the audio signal to the output i get a distorted signal
output signal:

i can not figure out why
what am i missing here
waiting for your replay
thank you

 

May be too much input.
Decrease the input AC voltage and check.

 

Your input voltage is too big and the amplifier is limiting. Try it with a 10mV input.

 

it works thank you guys,
but why this is happening?

 

Too much input distorts the input, hence the output too.

 

Look at the input and output voltages you now have. The output voltage divided by the input voltage gives you the gain of your amplifier. Your original circuit had a 1V input so multiply that by the gain and that is the output voltage your circuit was trying to produce but it only has a 12V supply voltage.

 

the problem is

the input signal is too much so the amp overclips.

 

wow that is intense
thanks
it is all clear now
cheer

 

Hi Alimash.
See
View attachment 115879

 

C3 is bypassing the emitter resistor so the emitter resistance for AC is only about 25 ohms (25mV/1mA). The gain is then 6800/25=272. Too much for the input/power supply voltage.

 

overclips...

That's a new word to add to my dictionary.

 

Well, you fix works, if what you want is an amp with a gain of 4.

There was nothing wrong with the original circuit. It is just that it had too much gain for the input signal you were giving it. If you had reduced the input signal as suggested it would have worked as well.

Bob

 

My 2cents ,too much gainin the circuit.Look closely at the emitter capacitor. It is boosting your gain to max,