So this question is a follow up to my previous question. Here is the story. Few days ago, while installing a 12v LED strip, I found out that the 12v AC-DC power adapter actually carries a high voltage AC in it. My question was marked as duplicated, and the answer from there states that the high voltage AC is from the capacitance between two inductors in the transformer. It really doesn't satisfy my curiosity because I have many AC-DC power adapters -- who don't? -- , and not all of them have this problem. So yesterday, I finally managed to open up that problematic 12v power adapter, and found out that there is a 222 2kv capacitor connected between the two inductors in the transformer. This is probably the reason to the HIGH voltage AC, but my question will be what is its purpose?
0, what are the purpose to the 222 2kv bridge capacitor?
Other than that, I have few more questions about this circuit design.
1, what is the unmarked IC used in this unit?
2, what are the purpose of the 3 parts: 100k, 222j, and diode on the high voltage side? ( red in the paper)
3, Why the IC is not connected to V+? Pin 8, 7 should be the drain to switch the transformer, and Pin 6 should be the feedback, and Pin 3 is the ground, Pin 1, 4, 6 are not connected to anything.
4, how reliable is this circuit design? any faulty?