A triangular oscillator is a circuit that produces a stable triangular wave signal. The principle is to realize periodic oscillation by using the charge and discharge process of capacitor and resistor in the feedback circuit, so as to produce a stable triangular waveform.
The three-point oscillator is a kind of LC sine wave oscillator. It is characterized by the three terminals of the LC parallel resonant circuit in the circuit are connected to the three terminals of the amplifier, so it is called the three-point oscillation circuit.