Single-supply op amp output connected to the film capacitor

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

The single-supply operation of the op amp means that the op amp is powered by only one type of power supply, such as DC 5V, DC 12V, single-supply, and the output has only one voltage. If the input waveform is changed, the output will only change in the positive voltage waveform. Mainly to look at the circuit function and the connection method of the front and rear stages to judge, in addition, the capacitance value of the capacitor is also a very important basis for judging. Generally speaking, if you connect this single operation amplifier into a half-wave rectification, then the capacitance of the output terminal is grounded, generally As a low-pass filter, the function is to filter the half-wave rectified head wave into DC. If the output end is a capacitor, the effect is differential.

By utilizing the characteristic that the voltage across the capacitor cannot be abruptly changed, only the signal of the upper half or the second half of the output of the single operational amplifier becomes the AC signal of the lower and lower half, which is generally referred to as the through-crossing. The purpose of the waveform is because of the latter stage. Positive and negative AC signals are required. Regardless of the output or the input, the film capacitor is used in many ways in the op amp circuit. If the signal is connected side by side, it is usually filtered (such as a low-pass filter). If it is a serial connection, then the latter circuit can know the function (such as high-pass filtering, etc.).