Can i apply sine wave to the base of the bjt?

[nismo87]

BJT

Can i apply sine wave to the base of the bjt? The sine wave is traversing in the positive and the negative region.

 

[FvM]

BJT

You can, as long you keep the maximum ratings (max. Ib and min. -Vbe). But what do you want to achieve? You surely don't get a sine wave at the output.

 

[mister_rf]

Re: BJT

Yes you can, but what's the topology used ?
See here
https://www.allaboutcircuits.com/vol_3/chpt_4/11.html

 

[nismo87]

BJT

Thanks

 

[manenef]

Re: BJT

Hello
make sure the transistor is well biased and then you can supply your signal.make sure the signal strength is not much greater than the biasing voltage otherwise you will drive your transistor to saturation

 

[biff44]

As the others stated, as long as you do not exceed the maximum limits, you can do it.

However, if the sine wave is going to put over +0.6 volts on the base, it is likely that you will blow out the transistor with too much base current. That is why you will usually see a resistor in series with the transistor base--to limit the maximum base current.

Also, if the negative going peak of the sine wave will exceed the base's reverse breakdown voltage, once again you will blow out the transistor with too much base current. Again a series resistor, if it is large enough, will protect the transistor.