Today we will share the types of oscillators. First, let's understand what oscillators are. An oscillator is an energy conversion device that can convert direct current energy into alternating current energy without external signal excitation. Widely used in electronic industry, medical treatment, scientific research, and other fields.
Oscillators can be mainly divided into two types, one is a harmonic oscillator, and the other is a relaxation oscillator.
The working principle of a harmonic oscillator is to connect the output of a narrowband filter to an amplifier, and then connect the output of the amplifier back to the input of the filter. When the power supply of the amplifier starts to supply, there is only noise at the output end of the amplifier. These noises are transmitted to narrowband filters, causing specific frequencies in the noise to be filtered out and appear at the output of the filter.
The working principle of a relaxation oscillator: A self-excited oscillation circuit composed of a single junction transistor, a resistor, and a capacitor, utilizing the negative resistance characteristics of a single junction transistor. A relaxation oscillator that generates square waves can be used for timing signals in sequential logic circuits such as timers and counters.
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