Passives - Revision history

Russ hensel at 20:23, 28 January 2009

2009-01-28T20:23:21Z

Russ hensel at 20:11, 28 January 2009

2009-01-28T20:11:50Z

Russ hensel: Reverted edits by 203.151.233.143 (Talk); changed back to last version by DavidCary

2009-01-04T00:02:40Z

Reverted edits by 203.151.233.143 (Talk); changed back to last version by DavidCary

203.151.233.143: aceltrerno

2009-01-03T14:28:26Z

aceltrerno

DavidCary: Reverted edits by 194.176.176.82 (Talk); changed back to last version by 134.39.229.113

2008-12-16T18:55:57Z

Reverted edits by 194.176.176.82 (Talk); changed back to last version by 134.39.229.113

Show changes

194.176.176.82: FIELD_OTHER

2008-12-16T18:48:10Z

FIELD_OTHER

Show changes

134.39.229.113: /* Carbon */

2008-09-26T14:39:08Z

Carbon

134.39.229.113: /* Carbon */

2008-09-26T14:38:53Z

Carbon

71.233.48.239: /* Wire-Wound */

2008-09-16T21:09:03Z

Wire-Wound

96.233.227.58: /* Wire-Wound */

2008-09-16T19:41:16Z

Wire-Wound

@@ Line 2: / Line 2: @@
 This article is being split into components check for duplication prior to updataing
+... I think it is pretty much dead and delinked.... now
 == Capacitors ==

@@ Line 1: / Line 1: @@
 {{stub}}
 == Capacitors ==
 === Basics ===

@@ Line 1: / Line 1: @@
 {{stub}}
 == Capacitors ==
@@ Line 20: / Line 19: @@
 Uses:
-* ac coupling â- blocking -- isolation
+* ac coupling –- blocking -- isolation
 * timing
 * Time for a capacitor to charge or discharge is very roughly RC where R is the resistor in series with the capacitor.
@@ Line 62: / Line 61: @@
 == Inductors ==
-An inductor reacts to current, but not to its value, but rather its change. It âtriesâ 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:
+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 ===
@@ Line 125: / Line 124: @@
 When a resistor is in series with a circuit the voltage across it will vary with the current ( ohms law ) Sometimes we do this with a low value of resistance and use the voltage across the resistor to measure or control the current.
 *Isolation :
-A resistor between but connecting 2 components will tend to equalize their voltage, but only using small currents. It the components âwant to go there own way, voltage wiseâ all they need do is put out a small current. For example people will sometimes ground themselves through a 10 mega ohm resistor. This tends to bring them to ground voltage, but they are protected from a deadly shock because most voltages cannot push a lethal current through 10 megs.
+A resistor between but connecting 2 components will tend to equalize their voltage, but only using small currents. It the components “want to go there own way, voltage wise” all they need do is put out a small current. For example people will sometimes ground themselves through a 10 mega ohm resistor. This tends to bring them to ground voltage, but they are protected from a deadly shock because most voltages cannot push a lethal current through 10 megs.
 *pull up or pull down:
 Sometimes a component will have a very high resistance to both the positive and negative side of the power supply and the voltage can easily drift around due to more or less random events. Under these conditions we will often connect a resistance ( typically around 10 K ohms ) to either the positive or negative side of the power supply. If to the positive side it is called a pull up resistor, if to the negative side a pull down resistor.
@@ Line 157: / Line 156: @@
 *Adjustable voltage divider.
 *Volume control.
-*Variable resistor ( sometimes used when the correct value of resistance is not know or available, then the pot is use: it is adjusted, perhaps just once, after the circuit is built â to âtweakâ the circuit into operating correctly.
+*Variable resistor ( sometimes used when the correct value of resistance is not know or available, then the pot is use: it is adjusted, perhaps just once, after the circuit is built – to “tweak” the circuit into operating correctly.
 *Trim or 0 adjustment

@@ Line 1: / Line 1: @@
 {{stub}}
 == Capacitors ==
@@ Line 19: / Line 20: @@
 Uses:
-* ac coupling –- blocking -- isolation
+* ac coupling â- blocking -- isolation
 * timing
 * Time for a capacitor to charge or discharge is very roughly RC where R is the resistor in series with the capacitor.
@@ Line 61: / Line 62: @@
 == 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:
+An inductor reacts to current, but not to its value, but rather its change. It âtriesâ 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 ===
@@ Line 124: / Line 125: @@
 When a resistor is in series with a circuit the voltage across it will vary with the current ( ohms law ) Sometimes we do this with a low value of resistance and use the voltage across the resistor to measure or control the current.
 *Isolation :
-A resistor between but connecting 2 components will tend to equalize their voltage, but only using small currents. It the components “want to go there own way, voltage wise” all they need do is put out a small current. For example people will sometimes ground themselves through a 10 mega ohm resistor. This tends to bring them to ground voltage, but they are protected from a deadly shock because most voltages cannot push a lethal current through 10 megs.
+A resistor between but connecting 2 components will tend to equalize their voltage, but only using small currents. It the components âwant to go there own way, voltage wiseâ all they need do is put out a small current. For example people will sometimes ground themselves through a 10 mega ohm resistor. This tends to bring them to ground voltage, but they are protected from a deadly shock because most voltages cannot push a lethal current through 10 megs.
 *pull up or pull down:
 Sometimes a component will have a very high resistance to both the positive and negative side of the power supply and the voltage can easily drift around due to more or less random events. Under these conditions we will often connect a resistance ( typically around 10 K ohms ) to either the positive or negative side of the power supply. If to the positive side it is called a pull up resistor, if to the negative side a pull down resistor.
@@ Line 156: / Line 157: @@
 *Adjustable voltage divider.
 *Volume control.
-*Variable resistor ( sometimes used when the correct value of resistance is not know or available, then the pot is use: it is adjusted, perhaps just once, after the circuit is built – to “tweak” the circuit into operating correctly.
+*Variable resistor ( sometimes used when the correct value of resistance is not know or available, then the pot is use: it is adjusted, perhaps just once, after the circuit is built â to âtweakâ the circuit into operating correctly.
 *Trim or 0 adjustment

@@ Line 139: / Line 139: @@
 === Carbon ===
-The most common found resistor is the carbor film. Theses are generally the cheapest and most used in devices. The commonly are designed to withstand 1/8, 1/4, 1/2, and 1 watts of power
+The most common found resistor is the carbor film. Theses are generally the cheapest and most used in devices. The commonly are designed to withstand 1/8, 1/4, 1/2, and 1 watts of power.
 === Metal Film ===

@@ Line 141: / Line 141: @@
 === Metal Film ===
 === Wire-Wound ===
-Useful for cheap and accurate resistance, but has significant inductance compared to film caps.
+Useful for cheap and accurate resistance, but has significant inductance compared to film resistors.  Some may be wound in one direction, others half in one direction half in the other, this second method reduces but does not entirely eliminate the inductance.  Very common in the range of 5 watts and up.  Beware of these for use.
 === Precision ===