ya sure KUNAL , these all calculations are taken practically by me , but first you have to make the DAC0808 circuit from DAC0808 data sheet , LF351 IC is also attached with DAC0808 output pin, when i was making this i apllied 5 volt , and set the LF351 GAIN to 5 volt, basically DAC0808 does not produce voltage it produce DC current maximum 2 ma, give me points NICE , COOL or SUPERB if you found this information useful