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Transistor amplifier parasitic oscilation

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ovidiu231:
Hello,I'm new here. I got a big problem, I build a class A amp with 2n2222a, biass point consist of 2x 10k resistors, on colector I have 4.7k and on emitor 2.2k. When I inject the signal from my function generator i get this...
Anyone have an ideea what is going on?

bob91343:
I can't read the voltage scale but I suspect you are overdriving it.

Circlotron:
Is there a coupling capacitor between your signal generator and the base of the transistor? A schematic diagram would help.

ovidiu231:
It's 1V/div

ovidiu231:
I tried with all kinds of caps. When I increase the amplitude, the bump increases too.

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