Omavahelikku

Omavahelikku, also known as a self-oscillating circuit or a relaxation oscillator, is an electronic circuit that generates a periodic, oscillating signal without the need for an external clock or timing signal. It is a type of oscillator that relies on the inherent properties of its components to produce a stable oscillation. The term "omavahelikku" is derived from the Finnish words "oma," meaning self, and "vahelikku," meaning oscillation.

The basic principle behind an omavahelikku is the use of a nonlinear element, such as a diode or a transistor, which causes the circuit to switch between two stable states. When the circuit is in one state, it charges a capacitor or an inductor, and when it switches to the other state, the stored energy is discharged. This process repeats, creating a periodic signal.

Omavahelikku circuits are commonly used in various applications, including signal generators, timers, and pulse generators. They are particularly useful in situations where a stable, low-frequency oscillation is required, and the use of an external clock signal is impractical or undesirable.

One of the simplest examples of an omavahelikku is the astable multivibrator, which consists of two transistors or operational amplifiers configured in a feedback loop. The circuit switches between two states, with each state corresponding to one of the transistors or amplifiers being active. The switching frequency is determined by the values of the resistors and capacitors in the circuit.

In summary, an omavahelikku is a self-oscillating circuit that generates a periodic signal without the need for an external timing signal. It relies on the nonlinear properties of its components to switch between two stable states, creating a stable oscillation. Omavahelikku circuits are widely used in various applications, including signal generators and timers.