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There are several types of capacitors (mainly depending on dielectric: electrolytic, coiled paper, air, ceramic) and for different purposes, the main idea for them is to allow current path for high frequency but a capacitor does not have only capacitance, it does have certain amount of series resistance and inductance depending on design so what works fine in audio frequencies do not do same job for radio frequencies or microwaves as the parasitic inductance becomes relevant. Some other use is tunning or preset where the capacitance is adjustable in order to accomplish resonance with an inductance. A capacitor (series of) is used in a ladder with diodes to rise DC from a low voltage oscillator. Killing HF oscillation is another use avoiding parasitic feedbacks.

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