Electronics > Beginners
Transistor amplifier parasitic oscilation
kg4arn:
Schematic please. Show the test point also.
Sorry I missed it :palm:
ledtester:
Check the DC biasing of the collector. With 10K / 16K biasing of the base LTspice says it is around 3.3V which is much too low.
Change the 16K resistor to 2K and see what happens. The collector should be around 7.4V and you should see an amplification of about 1.75.
Update: Attached the ltspice files.
T3sl4co1l:
That's what happens when the transistor saturates and the function generator is driving the emitter resistor. Draw out the voltages, you will see why this is so. :)
Tim
bob91343:
As I said, you are overdriving it. Back off on the input signal and it should clean up.
ovidiu231:
It worked, thank you so muchâ¤
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