I have created a 555 oscillator circuit where the output is set to have flashing LED light. Now I have a problem when I change the voltage of the potentiometer, the output frequency does not change. Here is the schematic of my circuit that I implemented in breadboard.
I used fixed ceramic capacitor of 10nF instead of varactor here for now. But If I change the capacitance and add 0.33uF, the flashing of LED doesn't change. Now LED only flashes with constant frequency. When I change potentiometer, I checked with multimeter that the voltage changes. I want to control the capacitance through the potentiometer so that the output frequency changes and LED flashing rate changes according to the changing of capacitance. Can anyone help me what is the problem here?
Components: CMOS 555 timer R1 = 1 kΩ, R2 = 4.7 kΩ, C1 = 10 µF and C2 = 0.01 µF 1 MΩ Potentiometer.