Other Passives

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Inductors

An inductor reacts to current, but not to its value, but rather its change. It “tries” to keep the current through it constant. Any change in current causes a voltage across the inductor. The key equation for an inductor ( it is a bit complicated, but anyway here it ) is:

equation here soon

where L = inductance ( units: henry ) V = voltage ( unit: volts ) I = current ( unit: Ampere ) t = time ( unit: seconds )

Uses:

• tuned circuits: a circuit that responds in a special way to some frequencies( s ).
• power supply filter: remove the pulsing DC left from rectification or other noise in the signal.
• Decoupling: usually blocking high frequencies from one part of a circuit from getting in another part.
• boost buck regulators: voltage regulators that decrease or increase voltage.

Links

• Inductor From Wikipedia, the free encyclopedia

Comments:

"Ferrites? I don't know much about 'em, I only use ferrites in switching regulators." --National Semiconductor's Bob Pease

Can be replaced in many circumstances with an impedance inverter using only an opamp, a capacitor, and a few resistors.