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We present the results of a systematic study of threshold instabilities in a Wien bridge oscillator. The dynamical circuit equations can be cast into a time-dependent Ginzburg-Landau form where the order parameter is the complex zero-dimensional amplitude of the oscillatory voltage. In this context we have been able to simulate behavior which in classical theory is characteristic of first-order, second-order, and tricritical phase transitions, and have measured the associated threshold properties.
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Horn et al. (1976) studied this question.
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