| [ Total Views: 577 | Total Replies: 7 | Thread Id: 49492 ] |
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 crewcabconnection
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| posted on March 4th, 2006 at 09:12 PM |
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12V to 5V - how do I do that then.
Got a gizmo I want to run ... sept it wants 5v to run, not 12v (basically comes with one of those 240v plugs that has a 5v power output female
connector).
So how to I get 12v down to 5v - with a resistor or something ---- jaycar? what gizmo.....
Cheers
Loves a lolcat
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 barls
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| posted on March 5th, 2006 at 09:15 AM |
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a step down transformer or power regulator
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type3lover
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| posted on March 5th, 2006 at 09:29 AM |
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Dick Smith sell 3 pin voltage regulators that will do what you want. They are only rated at 1 amp so will only run a device with a small current
draw.
LM 7805 CT +5V 1A V/Regulator $1.20 each
Cheers!
Toby
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crewcabconnection
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| posted on March 5th, 2006 at 10:57 AM |
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cheers for that...
Loves a lolcat
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tassupervee
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| posted on March 5th, 2006 at 11:01 AM |
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In the Data section of the Jaycar catalogues, you will find some really simple power supply circuits where you can use an LM7805 kind of regulator
that you can bias a 2N3055 power transistor to make yourself a pretty much bulletproof and high powered regulated power supply if you need more than
about 1 amp continuous.
The circuit is really basic and there are just a handful of parts needed and all the info you need to make it is in that section of the catalogue.
L8tr
E
Im not a complete idiot, quite a few parts are missing....
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Joel
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| posted on March 5th, 2006 at 03:26 PM |
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i bought one of those DC to DC converters from cheap skate auto to run my hands free and it was the biggest pos i ever bought
its suposed to drop 12 volts to either 1.5, 3, 6, 7.5 or 9 but it to is only good for 1 amp
Joel
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Quoll
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| posted on March 5th, 2006 at 04:50 PM |
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I made a dc to dc conveter for a mate to run a ps2 slim line; I used a few voltage regulators in series (or was it parallel?) I think the draw was
fairly large like 9 amps or something I just mounted them to a heat sink in a little kit box. From memory you could use a resistor if you know for a
fact that it will only draw a consistant amount of current and that the input voltage is always the same. |
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firefly
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| posted on March 7th, 2006 at 12:10 PM |
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Firstly look at the item you are wishing to run. Next work out how much current it will draw maximum. Most to the items you will be wanting to plug
into such a supply will be under 2 amps. Your best bet willl be to design and build a unit to do it for you as per discussion Tassupervee has raised.
this will give you a better outcome and something robust. I would also build it in such a way that you cannot plug it in backwards and thus reverse
polarity it. This can be exceptionally bad. Always fuse BOTH the input for the device as well as the feed to your supply. this will protect both
the unti you are plugging in and also your power supply.
If your looking at current under 1amp then a simple variable cig lighter socket type device may fit your requirements. just means that you will need
to fit a cig lighter so that the supply can be plugged in. This will also give you the added bonus of plugging other 12V cig adaptors etc (like phone
charger, or portible dvd into the socket).
Cheers
T
PS: What is the device you are wishing to run??
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