Where used, the capacitor isolates DC signal components between amplifier stages, including the amplifier's input and output terminals. DC isolation at a circuit node in the amplification chain applies only where a capacitor is correctly inserted in series with the signal path at the circuit "node" under consideration. Hence the isolation capacitor "performs" each of those functions you mention.I want to know about coupling capacitors. Is it used to block DC (one of elememts of input signal) go into DC stage or to block DC from DC stage go into previous amprifier(or something else)?
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