Variable Capacitor Circuit Symbol. The notations are all the same. Often we use this kind in a radio receiver turner and transmitters.
This type of variable capacitor is designed to be set when a circuit is made and then left without further adjustment. Capacitor can be used in a timer circuit by adding a resistor. Variable capacitor circuit symbol.
In view of all these uses capacitors of all types are used within circuit diagrams or schematics and capacitor circuit symbols are seen on virtually all circuit diagrams.
Polarised capacitors must be connected the correct way round. Used to vary the capacitance by turning the knob. The dielectric is air. The capacitance is varied by increasing or decreasing the effective area between the plates that effects the capacitance of the capacitor.
