Difference between revisions of "Other Passives"
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*[http://en.wikipedia.org/wiki/Inductors Inductor From Wikipedia, the free encyclopedia] | *[http://en.wikipedia.org/wiki/Inductors Inductor From Wikipedia, the free encyclopedia] | ||
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+ | == Transformers == | ||
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+ | Transformers are 2 or more inductors where the coils share the same magnetic field. This results in the current in one coil inducing a current in the other. They are commonly used to change the voltage from an AC source to a different voltage. We need much more description and information here. Would you add it? | ||
Comments: | Comments: |
Revision as of 19:49, 23 February 2010
This article is being split into components check for duplication prior to updataing
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
Transformers
Transformers are 2 or more inductors where the coils share the same magnetic field. This results in the current in one coil inducing a current in the other. They are commonly used to change the voltage from an AC source to a different voltage. We need much more description and information here. Would you add it?
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.