A temperature compensated, direct current feedback loop stabilizes the output level of an audio oscillator and gives the oscillator a negative effective output impedance, so that the oscillator can maintain a low distortion, constant level sine wave across the terminals of a remotely located load.
Sine wave generator apparatus wherein an amplitude correction signal is produced by integrating peaks of the sinusoidal output signal which exceed a reference voltage indicative of desired output signal amplitude. The sinusoidal output signal is generated by a resonant circuit which is excited into oscillation by a variable amplitude periodic signal supplied by an input circuit which receives a square wave signal whose repetition rate is equal to the output signal frequency. Amplitude of the periodic signal is varied by the amplitude correction signal, thus controlling the excitation level of the resonant circuit and the amplitude of the sinusoidal signal generated thereby.
