ElectronicsClass: Difference between revisions
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* Bread Board ( or [[AshClassBoard]] ) | * Bread Board ( or [[AshClassBoard]] ) | ||
* wire 24ga | * wire 24ga | ||
* | * 30ga solid core wire | ||
* Resistors 10kohm | * Resistors 10kohm | ||
* variable resistor 10kohm linear | * variable resistor 10kohm linear | ||
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* 1/8 male phono jack | * 1/8 male phono jack | ||
=== Class Topics === | === Class Topics === | ||
*Read The Fine | *Read The Fine Data Sheet: They hide secrets in the documentation. | ||
====Metering==== | ====Metering==== | ||
There are many like it but this one is mine. | There are many like it but this one is mine. | ||
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*** Current - Amps/Milliamps - check the leads | *** Current - Amps/Milliamps - check the leads | ||
*** diode check - see [Diodes] | *** diode check - see [Diodes] | ||
** leads - plugged into the right ports? | ** leads - plugged into the right ports? | ||
* Continuity testing | * Continuity testing | ||
** set the meter to the lowest resistance mode (200ohms or auto resistance) | ** set the meter to the lowest resistance mode (200ohms or auto resistance) | ||
** reads "off scale" when the leads are unconnected, this is an open circuit | ** reads "off scale" when the leads are unconnected, this is an open circuit | ||
** firmly touch leads together | |||
** reads near 0 if the leads are crossed | ** reads near 0 if the leads are crossed | ||
* Voltage testing | |||
** set meter to 20Vdc or VautoDC | |||
** touch leads to metered points | |||
** the reading on the meter is the difference in voltages between the leads | |||
====Soldering==== | ====Soldering==== | ||
Hold the cold end. | |||
Soldering ( for our purposes ) is the process of joining electrical contacts with a low melting point metal to make a mechanically and electrically strong connection. | |||
* Restrain long hair/clothing/jewelry. | * Restrain long hair/clothing/jewelry. | ||
* Clean both parts of waxes, oils or debris. | * Clean both parts of waxes, oils or debris. | ||
Line 42: | Line 51: | ||
** the meter should find near 0 ohms of resistance between the two parts even when mechanically stressed. | ** the meter should find near 0 ohms of resistance between the two parts even when mechanically stressed. | ||
** the meter should read "off scale" to everything that should be isolated | ** the meter should read "off scale" to everything that should be isolated | ||
==== | |||
* use the meter to diagram the electrical layout of the switch. | ====SwitchLab==== | ||
* solder | * use the continuity meter to diagram the electrical layout of the switch. | ||
* solder switch to the board. | |||
* test under power with meter voltage setting | |||
====Wire==== | ====Wire==== | ||
The basic wire is a pipe through which electrons can flow from the lowest voltage side to the highest | The basic wire is a pipe through which electrons can flow from the lowest voltage side to the highest (conventional current huh? [http://en.wikipedia.org/wiki/Electric_current]) up to the physical limits of the wire. | ||
* Current limit via wire gauge [http://www.powerstream.com/Wire_Size.htm] | * Current limit via wire gauge [http://www.powerstream.com/Wire_Size.htm] | ||
* Voltage limit via insulation. | * Voltage limit via insulation. | ||
=====BlueSmokeLab===== | =====BlueSmokeLab===== | ||
Get this out of the way early (and often) | |||
* turn off the switch | * turn off the switch | ||
* Solder the 30ga wire ends on to the lab 0 area | * Solder the 30ga wire ends on to the lab 0 area | ||
Line 58: | Line 70: | ||
====Resistor==== | ====Resistor==== | ||
Not like the NYC variety | |||
Resistors impede the flow of electrons across them; usually to protect components from excessive current. | |||
* [Ohm's law[http://en.wikipedia.org/wiki/Ohm%27s_law]] | |||
* Diagonal IV curve. | |||
* symmetric | |||
=====ResistorLab===== | |||
* solder resistors, meter and record; | |||
* compare to ohms law math | |||
====Diode==== | |||
* electrons only permitted to flow in one direction: cathode to anode | |||
** there are exeptions [diode breakdown voltage] | |||
* discontinuous IV curve | |||
* diode logic | |||
====Light Emitting Diode==== | ====Light Emitting Diode==== | ||
* the short lead is the cathode | |||
* LED's need current limiting (see [[ElectronicsClass:BlueSmokeLab]]) | |||
=====LEDLab===== | |||
* solder in 1kOhm resistor for the led , although you may use another if you can justify the value | |||
* Solder in the LED, with the short lead towards the ground. | |||
====Motor==== | ====Motor==== | ||
====Capacitor==== | ====Capacitor==== | ||
470uf electrolytic cap | |||
====Transistor==== | ====Transistor==== | ||
PN2222 N channel transistor | PN2222 N channel transistor | ||
====IC==== | ====IC==== | ||
LM386 Audio Amplifier [http://www.national.com/mpf/LM/LM386.html] | LM386 Audio Amplifier [http://www.national.com/mpf/LM/LM386.html] |
Revision as of 17:12, 6 January 2009
Electronics Class
This class is targeted at the beginner who wants to learn electronics. It would make a fine prerequisite to the AVRMicrcontrolerClass or the HAMClass
Required Materials
- Soldering Iron (25-30w)
- Solder ( 22ga )
- Bread Board ( or AshClassBoard )
- wire 24ga
- 30ga solid core wire
- Resistors 10kohm
- variable resistor 10kohm linear
- switch
- leds (various)
- pn2222 transistor
- lm386 audio amplifier ic
- 1/8 male phono jack
Class Topics
- Read The Fine Data Sheet: They hide secrets in the documentation.
Metering
There are many like it but this one is mine.
- Naming of parts
- metering modes
- restistance - Ohms of resistance
- voltage - Volts
- Current - Amps/Milliamps - check the leads
- diode check - see [Diodes]
- leads - plugged into the right ports?
- metering modes
- Continuity testing
- set the meter to the lowest resistance mode (200ohms or auto resistance)
- reads "off scale" when the leads are unconnected, this is an open circuit
- firmly touch leads together
- reads near 0 if the leads are crossed
- Voltage testing
- set meter to 20Vdc or VautoDC
- touch leads to metered points
- the reading on the meter is the difference in voltages between the leads
Soldering
Hold the cold end.
Soldering ( for our purposes ) is the process of joining electrical contacts with a low melting point metal to make a mechanically and electrically strong connection.
- Restrain long hair/clothing/jewelry.
- Clean both parts of waxes, oils or debris.
- Mechanically fit connections together
- Clean and wet the iron
- Heat both parts until hot
- Apply just enough solder to wet the contact surfaces
- Wait for the connection to shine smoothly
- remove the iron an test the connection
- the meter should find near 0 ohms of resistance between the two parts even when mechanically stressed.
- the meter should read "off scale" to everything that should be isolated
SwitchLab
- use the continuity meter to diagram the electrical layout of the switch.
- solder switch to the board.
- test under power with meter voltage setting
Wire
The basic wire is a pipe through which electrons can flow from the lowest voltage side to the highest (conventional current huh? [1]) up to the physical limits of the wire.
- Current limit via wire gauge [2]
- Voltage limit via insulation.
BlueSmokeLab
Get this out of the way early (and often)
- turn off the switch
- Solder the 30ga wire ends on to the lab 0 area
- stow fingers away from wire
- turn on switch
Resistor
Not like the NYC variety
Resistors impede the flow of electrons across them; usually to protect components from excessive current.
- [Ohm's law[3]]
- Diagonal IV curve.
- symmetric
ResistorLab
- solder resistors, meter and record;
- compare to ohms law math
Diode
- electrons only permitted to flow in one direction: cathode to anode
- there are exeptions [diode breakdown voltage]
- discontinuous IV curve
- diode logic
Light Emitting Diode
- the short lead is the cathode
- LED's need current limiting (see ElectronicsClass:BlueSmokeLab)
LEDLab
- solder in 1kOhm resistor for the led , although you may use another if you can justify the value
- Solder in the LED, with the short lead towards the ground.
Motor
Capacitor
470uf electrolytic cap
Transistor
PN2222 N channel transistor
IC
LM386 Audio Amplifier [4]