The first relaxation oscillator circuit, the astable multivibrator, was invented by Henri Abraham and Eugene Bloch using vacuum tubes during World War I. Balthasar van der Pol first distinguished relaxation oscillations from harmonic oscillations, originated the term "relaxation oscillator", and derived the first mathematical model of a relaxation oscillator, the influential Van der Pol oscillator model, in 1920. Van der Pol borrowed the term relaxation from mechanics; the discharge of the capacitor is analogous to the process of stress relaxation, the gradual disappearance of deformation and return to equilibrium in a inelastic medium. Relaxation oscillators can be divided into two classes.
A) Saw tooth, sweep, or fly back oscillator. B) Astable Multivibrator
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| Figure 1: A Relaxation Oscillator |
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| Figure 2: A Relaxation Oscillator |
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| Figure 3: Output Voltage and Capacitor Voltage |
According to above graph frequency is 166.6 Hz.
percent frequency error = [(166.6 - 158)/166.6]*100% = 5.16%
Resistors have a little error and those effect on the other parameters.
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| Figure 4: A schematic of Relaxation Oscillator |
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