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DC Power Supply

Parts.DCPowerSupply History

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It is always good practice to test a power supply before using it for the first time.
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It is always good practice to test a power supply before using it for the first time. The example below will show how to test a power supply with positive polarity. If you have a negative polarity power supply, then you will get a negative reading. You should then switch the position of the multimeter probes.
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(:if auth edit:)
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(:if auth edit:)
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# On your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.54V" everything is fine and dandy. If you get a reading of "-12.54V" then your probes are attached in reverse. If this happens and you are positive you connected your probes correctly, double check the polarity on your power supply's label and make sure the circuit you will be powering with this unit is designed to handle this polarity.
to:
# On your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.56V" everything is fine and dandy. If you get a reading of "-12.56V" then your probes are attached in reverse. If this happens and you are positive you connected your probes correctly, double check the polarity on your power supply's label and make sure the circuit you will be powering with this unit is designed to handle this polarity.
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It is always good practice to test a power supply before using it for the first time.
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!!! Abbreviations
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!! Abbreviations
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If the voltage showing on your multimeter is more than half a volt or a volt off its rating, then you most likely have what is called an '''unregulated''' power supply. The 12V Jameco power supply we used is this example is a regulated one, so that is why the voltage we received was so close to the voltage it was rated for.
to:
If the voltage showing on your multimeter is more than half a volt or a volt off its rating, then you most likely have what is called an '''unregulated''' power supply. The 12V Jameco power supply we used in this example is a regulated one, so that is why the voltage we received was so close to the voltage it was rated for.
Changed line 51 from:
# On your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.54V" everything is fine and dandy. If you get a reading of "-12.54V" then your probes are attached in reverse. If this happens and you are positive you connected your probes correctly, double check the polarity on your power supplies label and make sure the circuit you will be power with this unit is designed to handle this polarity.
to:
# On your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.54V" everything is fine and dandy. If you get a reading of "-12.54V" then your probes are attached in reverse. If this happens and you are positive you connected your probes correctly, double check the polarity on your power supply's label and make sure the circuit you will be powering with this unit is designed to handle this polarity.
Added lines 54-55:
If the voltage showing on your multimeter is more than half a volt or a volt off its rating, then you most likely have what is called an '''unregulated''' power supply. The 12V Jameco power supply we used is this example is a regulated one, so that is why the voltage we received was so close to the voltage it was rated for.
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# Plug your power supply into an AC outlet.%rframe thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Plug your power supply into an AC outlet.%rframe thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]] [[<<]] [-- Red probe goes into the tip [[<<]] Black probe touches the barrel --]
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%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/multimeter.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/multimeter.jpg]]
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# Plug your power supply into an AC outlet.
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# Plug your power supply into an AC outlet.%rframe thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.
%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%rframe thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%rframe thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%rframe width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]] | [-Testing your power supply-]
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# Turn on your multimeter and set it to read DC voltage.%thumb width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]]
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# Turn on your multimeter and set it to read DC voltage.%rframe width=200px% [[http://itp.nyu.edu/physcomp/images/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/check_powersupply.jpg"Positive Polarity"]] | [-Testing your power supply-]
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# Turn on your multimeter and set it to read DC voltage.%rframe width=200px% [[http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/powersupply_notes/check_powersupply.jpg]] | [-Testing your power supply-]
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# Turn on your multimeter and set it to read DC voltage.
# Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug.%rframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg"Positive Polarity"]] | [-Positive Polarity-]
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# Turn on your multimeter and set it to read DC voltage.%rframe width=200px% [[http://itp.nyu.edu/physcomp/images/check_powersupply.jpg | http://itp.nyu.edu/physcomp/images/check_powersupply.jpg"Positive Polarity"]] | [-Testing your power supply-]
# Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug
.
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# Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug.
%rframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg"Positive Polarity"]] | [-Positive Polarity-]
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# Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug.%rframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg"Positive Polarity"]] | [-Positive Polarity-]
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%rframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg"Positive Polarity"]] | [-Positive Polarity-]
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# Take the black (negative) probe from your multimeter and carefully touch it against the barrel of the plug without touching the tip or your red probe.
# On your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.54V"
to:
# Take the black (negative) probe from your multimeter and carefully touch it against the barrel of the plug without touching the tip or your red probe. If you make a connection, you will be creating a short circuit.
# On
your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.54V" everything is fine and dandy. If you get a reading of "-12.54V" then your probes are attached in reverse. If this happens and you are positive you connected your probes correctly, double check the polarity on your power supplies label and make sure the circuit you will be power with this unit is designed to handle this polarity.
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Part# 170245 (12V, 1000mA)''' Available at the NYU computer store.
to:
Part# 170245 (12V, 1000mA)'''\\
Available at the NYU computer store.
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'''Jameco 12V Regulated Switching Power Supply\\Part# 170245 (12V, 1000mA)''' Available at the NYU computer store.
to:
'''Jameco 12V Regulated Switching Power Supply\\
Part# 170245 (12V, 1000mA)''' Available at the NYU computer store.
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'''Jameco 12V Regulated Switching Power Supply, Part# 170245 (12V, 1000mA)''' Available at the NYU computer store.
to:
'''Jameco 12V Regulated Switching Power Supply\\Part# 170245 (12V, 1000mA)''' Available at the NYU computer store.
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Power supply is a reference to a source of electrical power.
to:
Power supply is a reference to the source of electrical power.
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There are many different kinds of DC Power Supplies but this one is most commonly used here at ITP:
to:
There are many different kinds of DC power supplies but this one is most commonly used here at ITP:
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'''Jameco 170245 (12V, 1000mA)''' Available at the NYU computer store.
to:
'''Jameco 12V Regulated Switching Power Supply, Part# 170245 (12V, 1000mA)''' Available at the NYU computer store.
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# Plug your power supply into an AC outlet.
# Turn on your multimeter and set it to read DC voltage.
# Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug.
# Take the black (negative) probe from your multimeter and carefully touch it against the barrel of the plug without touching the tip or your red probe.
# On your multimeter you should see a reading of the voltage coming from your power supply. If you are checking a 12V power supply and your multimeter shows "12.54V"

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(:if auth edit:)
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!! Regulated vs. Unregulated power supplies
to:
!! Regulated vs. Unregulated power supplies
(:if:)
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'''AC''' : Alternating Current\\
to:
'''AC''' : Alternating Current\\

!! Testing your power supply

!! Regulated vs. Unregulated power supplies
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Make sure you know the polarity of the plug so you don't reverse polarity on a component and blow it up.
The diagram below showing positive tip polarity on the left and negative tip polarity on the right. The center positive drawing on the left indicates that the center (tip) of the output plug is positive (+) and the barrel of the output plug is negative (-).
to:
Make sure you know the polarity of the plug so you don't reverse polarity for your circuit and damage your components.
The diagram below showing positive tip polarity is on the left and negative tip polarity is on the right. The center positive drawing on the left indicates that the center (tip) of the output plug is positive (+) and the barrel of the output plug is negative (-).
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'''VDC''' : Volts DC\\
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'''AC''' : Alternating Current\\
to:
'''AC''' : Alternating Current\\
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'''W''' : Watts\\
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'''W''' : watts
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'''W''' : watts
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! Abbreviations

'''V''' : Volts
'''A''' : Amperes
'''mA''' : miliAmperes
'''VA''' : Volt Amperes
'''VAC''' : Volts AC
'''DC''' : Direct Current
'''AC''' : Alternating Current
to:
!!! Abbreviations

'''V''' : Volts\\
'''A''' : Amperes\\
'''mA''' : miliAmperes\\
'''VA''' : Volt Amperes\\
'''VAC''' : Volts AC\\
'''DC''' : Direct Current\\
'''AC''' : Alternating Current\\
Changed lines 30-32 from:

- more information will be added soon \\
hyeki
to:
! Abbreviations

'''V''' : Volts
'''A''' : Amperes
'''mA''' : miliAmperes
'''VA''' : Volt Amperes
'''VAC''' : Volts AC
'''DC''' : Direct Current
'''AC''' : Alternating Current
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Most power supplies have a rating label that looks something like this.\\
Make sure you know the polarity of the plug so you don't reverse polarity on a component and blow it up.\\
to:
Most power supplies have a rating label that looks something like this.
Make sure you know the polarity of the plug so you don't reverse polarity on a component and blow it up.
Changed lines 22-24 from:
Most power supplies have a rating label that looks something like this.
Make sure you know the polarity of the plug so you don't reverse polarity on a component and blow it up.
to:
Most power supplies have a rating label that looks something like this.\\
Make sure you know the polarity of the plug so you don't reverse polarity on a component and blow it up.\\
The diagram below showing positive tip polarity on the left and negative tip polarity on the right. The center positive drawing on the left indicates that the center (tip) of the output plug is positive (+) and the barrel of the output plug is negative (-).

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to:
Make sure you know the polarity of the plug so you don't reverse polarity on a component and blow it up.
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Added lines 23-25:

%lframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_01.jpg"Positive Polarity"]] | [-Positive Polarity-]
%lframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_02.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_polarity_02.jpg"Negative Polarity"]] | [-Negative Polarity-]
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- more information will be added soon
to:
- more information will be added soon \\
hyeki
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- more information will be added soon
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Power supply is a reference to a source of electrical power. \\
Most electronic circuits require a DC power supply.
to:
Power supply is a reference to a source of electrical power.
Most electronic circuits require a DC power supply. \\
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Most electronic circuits require a DC power supply. \\
to:
Most electronic circuits require a DC power supply.
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Jameco 170245 (12V, 1000mA) Available at the NYU computer store.
to:
'''Jameco 170245 (12V, 1000mA)''' Available at the NYU computer store.
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- Click on any image for a larger view
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- Click on any image for a larger view.
to:
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*Click on any image for a larger view.
to:
- Click on any image for a larger view.
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*Click on any image for a larger view.

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%lframe width=350px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_01.jpg"DC Power Supply"]] | [-DC Power Supply-]
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%lframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_01.jpg"DC Power Supply"]] | [-DC Power Supply-]
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%lframe width=350px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_02.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_02.jpg"Label"]] | [-A rating label-]
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%lframe width=200px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_02.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_02.jpg"Label"]] | [-A rating label-]
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Power supply is a reference to a source of electrical power. A device or system that supplies electrical or other types of energy to an output load or group of loads is called a power supply unit.
to:
!! Overview

Power
supply is a reference to a source of electrical power. \\
Most electronic circuits require a DC power supply. \\
The most common operating voltages for microcontrollers and digital processors are 5V and 3
.3V.\\
There are many different kinds of DC Power Supplies but this one is most commonly used here at ITP:

[[<<]]
%lframe width=350px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_01.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_01.jpg"DC Power Supply"]] | [-DC Power Supply-]
Jameco 170245 (12V, 1000mA) Available at the NYU computer store.
[[<<]]

[[<<]]
%lframe width=350px% [[http://itp.nyu.edu/physcomp/uploads/power_supply_02.jpg | http://itp.nyu.edu/physcomp/uploads/power_supply_02.jpg"Label"]] | [-A rating label-]
Most power supplies have a rating label that looks something like this.
[[<<]]


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Power supply is a reference to a source of electrical power. A device or system that supplies electrical or other types of energy to an output load or group of loads is called a power supply unit.
  Edit | View | History | Print | Recent Changes | Search Page last modified on May 14, 2009, at 04:41 PM