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230Vac, semi amplitude 320V, midle voltage 0V

From this circuit I expected about 230Vcc, but I get 160Vcc.

In addition the diodes flash and I do not understand which values ​​to change.

The oscilloscope detects 50Hz even if in Vcc (At most they should be 100Hz).

 

 

Greetings

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In addition the diodes flash and I do not understand which values ​​to change.

Diode flash means maximum current surpassed.

 

About other issues, the simplest thing you can do is to remove the ground and connect Oscilloscope Ref. pin, like this: