rOmV4 - Capacitor Coupling

If an AC signal such as audio or radio needs to be coupled from one sub-system to the next, a coupling capacitor is often needed.

If the DC output level of the first sub-system is the same as the DC input level of the input of the next sub-system, a wire can be used. In all other cases, a coupling capacitor is needed.

Microphone Amplifier Example

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