lats
Full Member level 4
Dear all
i am designing a voltmeter for AC mains line. i m using this peak detector circuit which i have taken from this site. The opamp i am using is TL074. the circuit works fine but the problem is the settling time for the voltage is very high. suppose i feed 1 volts Ac peak to input of peak detector i get 2 volts dc output and after that it starts dropping gradually to 1.9 volts ,1.8 volts ...and so on and reaches 1volts dc value after 40-50 seconds. when i make the capacitor value small say 0.1 uF then settling time becomes 10-20 seconds but the value becomes unstable and incorrect.how to solve the problem?
thanks
i am designing a voltmeter for AC mains line. i m using this peak detector circuit which i have taken from this site. The opamp i am using is TL074. the circuit works fine but the problem is the settling time for the voltage is very high. suppose i feed 1 volts Ac peak to input of peak detector i get 2 volts dc output and after that it starts dropping gradually to 1.9 volts ,1.8 volts ...and so on and reaches 1volts dc value after 40-50 seconds. when i make the capacitor value small say 0.1 uF then settling time becomes 10-20 seconds but the value becomes unstable and incorrect.how to solve the problem?
thanks