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my phone just shut down and after opening it, it's asking for a security code and i don't know it. So I was thinking of formatting it. But I don't know how to. looks like the call button + * + 3 is for N60 series only.. need some help.

Design a full-wave rectifier using an 18V center-tap transformer. The output ripple is not to exceed 5% of the output voltage with a load resistance of 680 ohms. Specify the Io and PIV ratings of the diodes and select an appropriate diode.