60Hz input notch filter circuit
Source: InternetPublisher:公子李 Keywords: AC power supply and other power circuits Updated: 2021/07/27
60Hz input notch filter circuit
The picture shows the 60Hz input notch filter circuit. The notch filter consists of an instrument amplifier INA110 and a double-T network. The 2kΩ potentiometer is used to set the Q value of the circuit. When the mains frequency is 50Hz, the resistance value of the filter needs to be changed, that is, 5.34MΩ is changed to 6.37MΩ; 2.67MΩ is changed to 3.16MΩ. The purpose of this circuit is to filter out hum in the circuit.
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