Category: 1. Oscillator

The Twin-T Oscillator is another RC oscillator circuit which uses two parallel connected RC networks to produce a sinusoidal output waveform of a single frequency. Twin-T Oscillators are another type of RC oscillator which produces a sinewave output for use in fixed-frequency applications similar to the Wein-bridge oscillator. The twin-T oscillator uses two “Tee” shaped RC networks in…

One of the most important features of any oscillator is its frequency stability, or in other words its ability to provide a constant frequency output under varying load conditions. Quatz crystal oscillators overcome some of the factors that affect the frequency stability of an oscillator. These generally include: variations in temperature, variations in the load, as…

The Wien Bridge Oscillator uses uses two RC networks connected together to produce a sinusoidal oscillator. In the RC Oscillator tutorial we saw that a number of resistors and capacitors can be connected together with an inverting amplifier to produce an oscillating circuit. One of the simplest sine wave oscillators which uses a RC network in place…

RC Oscillators use a combination of an amplifier and an RC feedback network to produce output oscillations due to the phase shift between the stages. A single stage transistor amplifier can produce 180o of phase shift between its output and input signals when connected as a common-emitter type amplifier and we can use this configuration to…

The Colpitts Oscillator design uses two centre-tapped capacitors in series with a parallel inductor to form its resonance tank circuit producing sinusoidal oscillations. In many ways, the Colpitts oscillator is the exact opposite of the Hartley Oscillator we looked at in the previous tutorial. Just like the Hartley oscillator, the tuned tank circuit consists of an LC…

The Hartley Oscillator design uses two inductive coils in series with a parallel capacitor to form its resonance tank circuit producing sinusoidal oscillations. Unlike the Hartley Oscillator, one of the main disadvantages of the basic LC Oscillator tank circuit which we looked at in the previous tutorial, is that they have no means of controlling…

Oscillators are electronic circuits that generate a continuous periodic waveform at a precise frequency. An LC Oscillator converts a DC input (the supply voltage) into an AC output (the waveform). This output waveform can have a wide range of different shapes and frequencies, and can be either complex in shape, or be a simple pure sine wave depending…