Example of an Oscilliscope Display of the Output.
Roll the mouse cursor over the voltage input to see the change in the frequency output

VOLTAGE  Time Div = 1 ms  10 Volts 9 Volts 8 Volts 7 Volts 6 Volts 5 Volts 4 Volts 3 Volts 2 Volts 1 Volt_ 0 Volts