Tremolo
The described phase shift oscillator circuit employs the LM324 operational amplifier, which is configured to generate oscillations at a frequency adjustable between 5 Hz and 10 Hz. The frequency adjustment is achieved through a speed potentiometer that alters the feedback and phase shift characteristics of the oscillator circuit.
The oscillator output is taken from the depth potentiometer, which serves a dual purpose. Not only does it provide a means to control the depth of modulation, but it also influences the output signal that modulates the on-resistance of two 1N914 diodes. These diodes are configured as voltage-controlled attenuators, allowing for dynamic control of the signal amplitude based on the oscillator output.
To ensure optimal performance of the circuit, it is crucial to maintain the input signal level below 0.6 V peak-to-peak. Exceeding this threshold could lead to distortion in the output, characterized by clipping, which would adversely affect the integrity of the oscillator's performance.
In summary, this phase shift oscillator circuit leverages the LM324 op-amp and the 1N914 diodes to create a versatile system capable of generating low-frequency oscillations while allowing for controlled signal modulation, provided that the input signal levels are carefully managed.A phase shift oscillator using the LM324 operates at an adjustable rate, 5-10 Hz, set by the speed pot. A portion of the oscillator output is taken from the depth pot and used to modulate the on resistance of two 1N914 diodes operating as voltage controlled attenuators.
Care must be taken to restrict the incoming signal level to less than 0.6 V pk-pk, or undesirable clipping will occur. 🔗 External reference
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