Talking about the Function of Single-Supply Operational Amplifier Output Film Capacitor

The film capacitor is a capacitor with a metal foil as an electrode, which is laminated with a plastic film such as polyethylene, polypropylene, polystyrene, or polycarbonate from both ends and wound into a cylindrical structure. According to the type of film, it can be divided into polyethylene capacitor, polypropylene capacitor, polystyrene capacitor, and polycarbonate capacitor. So what is the role of a single-supply op amp output connected to a film capacitor?

Operational amplifier single power supply means that the operational amplifier only uses one type of power supply, such as DC 5V, DC 12V, single power supply, and the output has only one voltage. If the input waveform changes, the output changes only in the positive voltage waveform. It is mainly judged by the circuit function and the connection method of the front and rear stages. In addition, the capacitance value of the capacitor is also a very important basis for judgment. If the single op amp is connected to a half-wave rectifier, then the capacitor at the output is grounded. Generally, it is used as a low-pass filter to filter the gimmick wave rectified by the half-wave to DC. If a capacitor is connected in series at the output, the function is differential.

Utilizing the characteristic that the voltage across the capacitor cannot be abruptly changed, only the first half or the second half of the signal output by the single op amp is changed into the AC signal that is present at the bottom and the bottom, that is, the straight-through communication is generally used. The purpose of the waveform is because of the latter Need to use positive and negative AC signals. Regardless of the output or input, the use of film capacitors in op amp circuits is very many. If they are connected at the same time, they are usually filtered (such as low-pass filters). If it is connected in series, then you can see the function (such as high-pass filtering, etc.) by looking at the subsequent circuit.

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