If the capacitance of an op-amp oscillator circuit were suddenly doubled, what would be the most noticeable effect?

When the capacitance in an op-amp oscillator circuit is doubled, the most noticeable effect is that the frequency of the oscillation would be lower. This is directly related to the relationship between frequency and capacitance in oscillator circuits. In such circuits, the frequency of oscillation is inversely proportional to the capacitance.

Specifically, in many oscillator designs, the frequency is determined by the formula that includes the capacitance, resistance, and other parameters. When the capacitance increases, it takes longer for the capacitor to charge and discharge during the oscillation cycle, which results in a longer period and, consequently, a lower frequency.

In summary, doubling the capacitance effectively slows down the rate at which the op-amp oscillator can complete its cycles, leading to a decrease in frequency.