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To decouple a subcircuit from AC signals or [[voltage spike]]s on a power supply or other line, a bypass capacitor is often used. A bypass capacitor is to [[Shunt (electrical)|shunt]] energy from those signals or transients past the subcircuit to be decoupled, right to the return path. For a power supply line, a bypass capacitor from the supply voltage line to the power supply return (neutral) would be used.
High frequencies and transient currents flow through a capacitor, in this case in preference to the harder path through the decoupled circuit, but DC cannot go through the capacitor, so continues on to the decoupled circuit
==Switching subcircuits==
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