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If you have a potentiometer of value somewhere between 2k and 2.5k, you could substitute it for the 2.2k collector resistor. If you have a 5k potentiometer, you could parallel it with a 4.7k resistor and substitute the parallel combination for the 2.2k collector resistor.
Connect the output capacitor to the potentiometer wiper instead of the transistor collector.
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