[SOLVED] urgent on electronic load converter- power MOSFET

[linju]

i am working on designing an electronic load converter.. the project is like we are designing a bypass circuit so that when there is voltage fluctuations the POWER MOSFET is triggering and bypassing the current to dummy loads.... so If voltage fluctuation there mosfet triggers and given to a control circuit.
now i require a circuit such that when there is variation in AC VOLTAGE from 0-220v using an auto transformer corresponding variation as dc output voltage i should get and the range should be 0-2.5V or 0-10V DC. my idea was to use a voltage divider circuit and then use a rectifier but i am not getting an exact idea how to do this... please any could help me.......
in short AC Variable to corresponding DC variable of low range

 

[chuckey]

Use a transformer for safety. Select a high secondary voltage, say 24V, and use a diode bridge. You should get a pulsating DC wave out that is 24V X 1.414 - 2 X .7V = ~ 31.5V. Then use a pair of resistors to step it down to so 230V in gives you 5 V out. If you want a pure DC, connect a 100 MF 35 Volts working or greater capacitor across the output of the bridge, observing its polarity when connecting.
Frank