A Resistance-Tuned Frequency-Modulated Oscillator for Audio-Frequency Applications

A new-type oscillator is described which utilizes a simple resistance-capacitance feedback network with a single variable element controlling the frequency of oscillation. The design considerations outlined permit wide variations in frequency without excessive amplitude modulation or harmonic distortion. In principle, these common difficulties may be reduced to any desired minimum. This operation is achieved without the use of fiaters or limiter stages.