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ElectronicsClass: Difference between revisions

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* Bread Board ( or [[AshClassBoard]] )
* Bread Board ( or [[AshClassBoard]] )
* wire 24ga  
* wire 24ga  
* Blue smoke lab 0 30ga solid core wire.
* 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 Manual:  They hide the secrets in the documentation.  
*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====
Heat, beat and treat: 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.   
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.
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** 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
====Switch====
 
* use the meter to diagram the electrical layout of the switch.
====SwitchLab====
* solder the switch to the board.
* 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. (conventional current huh? [http://en.wikipedia.org/wiki/Electric_current]). This works up to the physical limits of the wire
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
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====Resistor====
====Resistor====
  Resistance = Ohms
  Not like the NYC variety
[Ohm's law[http://en.wikipedia.org/wiki/Ohm%27s_law]]
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====
====Diode====
====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?
  • 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

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]
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