Editing Passives
Jump to navigation
Jump to search
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 1: | Line 1: | ||
{{stub}} | {{stub}} | ||
− | |||
− | |||
− | |||
− | |||
== Capacitors == | == Capacitors == | ||
=== Basics === | === Basics === | ||
Line 17: | Line 13: | ||
A simple application of the formula above occurs when a constant or near constant current flow into a capacitor: then the voltage across it increases at a constant rate, the graph of the voltage against time will be a line rising ( or falling for a negative current ) from the left to the right. If the current is constant the line is straight. | A simple application of the formula above occurs when a constant or near constant current flow into a capacitor: then the voltage across it increases at a constant rate, the graph of the voltage against time will be a line rising ( or falling for a negative current ) from the left to the right. If the current is constant the line is straight. | ||
− | |||
− | |||
− | |||
Uses: | Uses: | ||
Line 32: | Line 25: | ||
All capacitors are formed by having 2 conductors ( or plates ) connected to the two terminals of the capacitor. The conductors are separated from each other by insulator, typically very thin. Adding charge to one side forces like charge off the opposite plate because like charges repel. The larger the plates and the closer together they are the less voltage it takes to force in the charge. If the insulator ( called the dielectric ) is too thin it will be pierced by the charge and the capacitors becomes a conductor. Typically the basic specifications for a capacitors are its capacitance and the maximum voltage that can be used without causing the dialectic to break down. | All capacitors are formed by having 2 conductors ( or plates ) connected to the two terminals of the capacitor. The conductors are separated from each other by insulator, typically very thin. Adding charge to one side forces like charge off the opposite plate because like charges repel. The larger the plates and the closer together they are the less voltage it takes to force in the charge. If the insulator ( called the dielectric ) is too thin it will be pierced by the charge and the capacitors becomes a conductor. Typically the basic specifications for a capacitors are its capacitance and the maximum voltage that can be used without causing the dialectic to break down. | ||
<BR>There are many diferent technologies for manufacturing capacitor each with its own advantages and disadvantages. | <BR>There are many diferent technologies for manufacturing capacitor each with its own advantages and disadvantages. | ||
+ | <BR>Some capacitors manufactured between 1999 until today are made with bad electrolyte. Avoid these, see [[Capacitor plague]] for more info. | ||
External Links | External Links | ||
Line 39: | Line 33: | ||
# [http://www.northcountryradio.com/PDFs/column008.pdf RC Timers and Timing Circuits] | # [http://www.northcountryradio.com/PDFs/column008.pdf RC Timers and Timing Circuits] | ||
# [http://en.wikipedia.org/wiki/Decoupling_capacitor Decoupling capacitor From Wikipedia, the free encyclopedia] | # [http://en.wikipedia.org/wiki/Decoupling_capacitor Decoupling capacitor From Wikipedia, the free encyclopedia] | ||
− | |||
=== Electrolytic === | === Electrolytic === | ||
In electrolytic capacitors the insulating layer is formed by electro chemical action between the plates and other chemicals in the capacitor. This forms a very thin layer which allows large capacitance in a small package. Typically this works for one polarity and not another so electrolytic capacitors are marked with their polarity. There are some non-polarized electrolytics, but they are not common. | In electrolytic capacitors the insulating layer is formed by electro chemical action between the plates and other chemicals in the capacitor. This forms a very thin layer which allows large capacitance in a small package. Typically this works for one polarity and not another so electrolytic capacitors are marked with their polarity. There are some non-polarized electrolytics, but they are not common. | ||
− | |||
− | |||
− | |||
==== Aluminum ==== | ==== Aluminum ==== | ||
==== Tantalum ==== | ==== Tantalum ==== | ||
Line 64: | Line 54: | ||
== Inductors == | == Inductors == | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
"Ferrites? I don't know much about 'em, I only use ferrites in switching regulators." --National Semiconductor's Bob Pease | "Ferrites? I don't know much about 'em, I only use ferrites in switching regulators." --National Semiconductor's Bob Pease | ||
Line 91: | Line 59: | ||
== Resistors == | == Resistors == | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
List of standard 1% resistors. If you want 1% resistors, you must pick from this list or you will pay a fortune for the resistor, assuming you can ever get it. | List of standard 1% resistors. If you want 1% resistors, you must pick from this list or you will pay a fortune for the resistor, assuming you can ever get it. | ||
Interpret these numbers as the "mantissa" of the value. | Interpret these numbers as the "mantissa" of the value. | ||
Line 119: | Line 72: | ||
806 825 845 866 887 | 806 825 845 866 887 | ||
909 931 953 976 | 909 931 953 976 | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
=== Carbon === | === Carbon === | ||
− | |||
− | |||
=== Metal Film === | === Metal Film === | ||
=== Wire-Wound === | === Wire-Wound === | ||
− | |||
− | |||
=== Precision === | === Precision === | ||
− | + | === Potentiometers === | |
− | == Potentiometers == | + | [[Digital_Potentiometers]] |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
[[Category:Components]] | [[Category:Components]] |