Transistor Overvoltage Realization

Overvoltaged Transistor

The voltage at the collector is too high for the transistor to handle, so it goes into conduction. Once the transistor is conducting, the 50 ohm resistor and the 200k ohm resistor form a voltage divider, which makes the voltage at the collector very small. Thus, the transistor stops conducting. This makes the voltage at the collector too high again, and the cycle repeats.