Amplifier circuit for low frequency measurement

Published:2012/12/5 21:22:00 Author:Ecco | Keyword: Amplifier, low frequency measurement | From:SeekIC

In order to accurately measure small amplitude AC voltage, the measuring circuit with operational amplifier is used. Operational amplifier NE530 can be used, the measurement frequency is more than 200kHz, so it can be used in the low frequency region. Measurement noise voltage can be ignored because it only has a few microvolts. Amplification factor 1 or 10 can be converted by the switch S on negative feedback branch circuit. When the amplification factor is 10, the amplification can be adjusted by potentiometer Rp. For example, if the input voltage is 100mV, you can adjust the output voltage to 1V.



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