Vco Circuit. Since our vco is operating on a single supply 5v rail the output of the converter needs to be between 0v and 5v. There are many types of vco circuits.
So we need a circuit to take in a linear voltage from the keyboard controllers and produce an exponential voltage which doubles in value for every octave. Obviously if the vco is. Vco load pulling refers to the change in oscillator frequency that occurs when the oscillator load impedance is changed.
The applied input voltage determines the instantaneous oscillation frequency.
Voltage controlled oscillator vco design for plls the performance of the voltage controlled oscillator in any phase locked loop is a key circuit block determining many aspects of the overall performance. Consequently a vco can be used for frequency modulation fm or phase modulation pm by applying a modulating signal to the control input. Also op amps multivibrator transistors 555 timers can also be utilised to build oscillating circuits. In the circuit the external input voltage is applied to the control voltage pin 5 of the ic.
