Can i increase the output voltage by increasing the turns?

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My schematic here attached,transformer details also, In this circuit , +12V getting 10.5V only can i increase that one to 15V similarly the +5V and -5V to the 9V respectively
No arun,u cannot increase it to 15V , transformer design would get affected
Hi prasun, please tell me the changes with transformer , w r to shield winding or any other ?
arun mail me,i will give u my new number. prasunkuls@hotmail.com