I'm trying to build a circuit to get 220 VAC. I thought that building an oscillator and connecting the oscillator output to the input of the transformer, I could get 220VAC.
The problem is when I connect the output of the oscillator because I don't get nothing in the output of the transformer. I'm resolving this problem in other thread.
My question here is... I need to use the part inside the red square? I mean, I need to use the transistor or I can connect the oscillator directly to the transformer without using the transistor?
A friend told me that I need to use a diode with the transistor. It's necessary? Why?
If I need to use the transistor instead of conecting directly the oscillator to the input of the transformer... Can you tell me why I need to use the transistor instead of connecting the oscillator directly to the transformer?
In the picture you can see all.
https://img717.imageshack.us/i/transformerb.jpg/
When I put the transistor, the light bulb (12V 0.3Ah) lights very few. In the multimeter I can read 3 Volts.
If I remove the resistor and the transistor and I connect the light bulb directly to the pin 3, then the light bulb bright is the common one.