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[[Image:5V DC and 12 DC power suppy.PNG|thumb|5V DC and 12 DC power suppy|200px]] | [[Image:5V DC and 12 DC power suppy.PNG|thumb|5V DC and 12 DC power suppy|200px]] | ||
Typical PC power supplies have maximum output power ratings ranging from 300 watts to 500 watts and contain circuitry | Typical PC power supplies have maximum output power ratings ranging from 300 watts to 500 watts and contain the needed circuitry to convert alternating current (at 110V or 220V) into direct current at a lower potential (5V and 12V) for your low voltage needs. | ||
Computer components require a clean (ripple free) power supply, when the voltage of either the 12V or 5V (in some cases 3.3 is also provided) begins to drop below or above this point computer crashes can become more frequent. Your local computer repair shop may have several "bad" power supplies on hand that you could acquire for a very low price. | |||
Tools: | Tools: | ||
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Materials: | Materials: | ||
*Old computer power supply | *Old computer power supply | ||
* | *Electric connection block (optional) | ||
One benefit of using an old computer power supply as your power supply is that the enclosure will already be grounded (as long as you use a three prong grounded outlet) and there will be minimal risk of shock to the user. | |||
The plug houses connections to both the 5V and 12V rails is called a {{WP|Molex_connector}} . If you want to clean up the appearance of your power supply feel free to cut the other wires and plugs - but be sure that there is no possibility of any contact between bare wires as this can cause a short circuit and damage your power supply. | |||
You may want to retain the ON/OFF switch of your power supply. However, if you want your power supply to continuously run while plugged you can cut the leads of the switch and the leads of the AC input and connect them both together using the connection block as shown in the third image. | |||
Please not that the power supply in this image is an older AT type. The supply you have acquired may be a of different form factor. Therefore it may be best not to remove wires or otherwise modify the power supply. In any case the molex connection is fairly standard and should be found on almost all types. If you have any doubts as to which connections can provide 12V or 5V a {{WP|multimeter}} will be of much help. | |||
== Using a Rectifier Circuit Directly == | == Using a Rectifier Circuit Directly == | ||
Revision as of 17:08, 10 July 2009
How to make a low voltage DC power supply
- Input 220 volt AC, or 110 volt AC power
- Output 12 volt DC, and 5 volt DC
You can connect the Low voltage power supply with:
- Car socket 12 volt
- 12V DC equipment.
- 3rd world CCFL lamp (2007 model)
Links Low voltage connection basics
Using a PC power supply
Typical PC power supplies have maximum output power ratings ranging from 300 watts to 500 watts and contain the needed circuitry to convert alternating current (at 110V or 220V) into direct current at a lower potential (5V and 12V) for your low voltage needs.
Computer components require a clean (ripple free) power supply, when the voltage of either the 12V or 5V (in some cases 3.3 is also provided) begins to drop below or above this point computer crashes can become more frequent. Your local computer repair shop may have several "bad" power supplies on hand that you could acquire for a very low price.
Tools:
- screwdriver
- cable cutter
Materials:
- Old computer power supply
- Electric connection block (optional)
One benefit of using an old computer power supply as your power supply is that the enclosure will already be grounded (as long as you use a three prong grounded outlet) and there will be minimal risk of shock to the user.
The plug houses connections to both the 5V and 12V rails is called a W . If you want to clean up the appearance of your power supply feel free to cut the other wires and plugs - but be sure that there is no possibility of any contact between bare wires as this can cause a short circuit and damage your power supply.
You may want to retain the ON/OFF switch of your power supply. However, if you want your power supply to continuously run while plugged you can cut the leads of the switch and the leads of the AC input and connect them both together using the connection block as shown in the third image.
Please not that the power supply in this image is an older AT type. The supply you have acquired may be a of different form factor. Therefore it may be best not to remove wires or otherwise modify the power supply. In any case the molex connection is fairly standard and should be found on almost all types. If you have any doubts as to which connections can provide 12V or 5V a W will be of much help.
Using a Rectifier Circuit Directly
Tools:
Half-Wave Rectifier
Full-Wave Rectifier
