Obviously, the amplifier has lots of gain because you are very strong! By delivering feedback in the form of just the right strength push at just the right time, you can keep the pendulum swinging forever - or at least until dinner. The amplifier is whatever delivers the push - such as you. (Interestingly, the mass of the pendulum doesn’t matter!) The frequency-determining element of the pendulum oscillator is its length, L. 1 Given a push, the pendulum will swing back and forth at a constant frequency until friction and air resistance bring it to a halt at the rest position in the center. B shows a pendulum which is a mechanical version of the system in A.įigure 1B shows a pendulum which is an example of a non-electronic oscillator. The block diagram (A) describes an oscillator as three circuits: one providing gain and the other two feeding back a fraction of the output signal into the input through a filter. Every single oscillator - even the digital versions, multivibrators like the 555 IC, and the ones in the little metal cans - has this same basic structure: an amplifier, some feedback, and a frequency-determining filter.įIGURE 1. There is an old saying: “Amplifiers are oscillators that don’t and oscillators are amplifiers that do.” An amplifier is at the heart of every oscillator, as shown in the block diagram of a basic oscillator in Figure 1A. Let's see how to make an audio oscillator and learn about common types of RF oscillators. In ham radio, the oscillator is a key element in generating signals, mixing them together, and extracting the information from them. Every signal begins with an oscillator - the topic of this article.
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