Voltage Regulator
Voltage is regulated by this circuit . A.c single phase 230v supply is used. A step down transformer 230/18v is used which is converting 230v supply into 18v. A full wave bridge rectifier is using to convert that step down a.c. supply into d.c supply.
The positive half cycle is going to the positive terminal and and negative half cycle is goint to the negative terminal.
In positive terminal there is a ic 7812 which gives the positive output voltage and in negative terminal there is ic 7912 which gives negative output voltage.
On the positive terminal there is another ic LM317 which two out of three terminals i.e. output and adjust are shprt circuited which gives the regulated output voltage and its input terminal is connected to the output terminal of ic7812.
Hence regulated output voltage is obtained at the positive terminal of the circuit.
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