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Old 02-18-2008, 05:36 PM   #1
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Electrical wiring question - 12 volts to 9 volts

Hi

I have searched the forums on how to hook up additional power devices such as cameras, radar, GPS etc. I also see that you can buy cigarette adaptors that can simplify the process.

My question is, is it possible to hard wire (no need for a connection kit) a device (with an inline fuse) into your wiring system. The device is drawing 9 volts DC do I need to put a converter in line? Or will it simply draw the voltage that it needs?

Regards Exup
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Old 02-18-2008, 08:12 PM   #2
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Re: Electrical wiring question - 12 volts to 9 volts

Somebody must know how to transform 12V to 9V...Bosozoku/Steve where are you?
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Old 02-18-2008, 09:25 PM   #3
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Re: Electrical wiring question - 12 volts to 9 volts

you can hook up a resistor inline to drop your voltage down to 9 volts
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Old 02-18-2008, 09:33 PM   #4
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Re: Electrical wiring question - 12 volts to 9 volts

Quote:
Originally Posted by exup View Post
My question is, is it possible to hard wire (no need for a connection kit) a device (with an inline fuse) into your wiring system. The device is drawing 9 volts DC do I need to put a converter in line? Or will it simply draw the voltage that it needs?

Regards Exup
'Tis do-able, as long as you understand your 12 volt system is usually carrying 13-14 volts.

What you need is a voltage divider.. Dummies like me need to use the plug-in version. This will not produce a regulated power supply, just a reduction in voltage that will vary load.

This would be the safe way to go; not as cheap as DIY, but it's plug-and-play.
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Old 02-18-2008, 09:35 PM   #5
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Re: Electrical wiring question - 12 volts to 9 volts

It is possible to just use resistors to drop the voltage but I wouldn't really recommend it.
I'd suggest using a DC to DC converter.

Many inexpensive ones are available at local electronic shops (radio shack for example).
You can also find them at auto parts stores. Here's an example of one.

If you would rather do it yourself here's a place that shows you how... clicky.
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Old 02-18-2008, 11:14 PM   #6
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Thumbup Re: Electrical wiring question - 12 volts to 9 volts

Hi

many thanks to all the replies. At least you have confirmed that I can not just hook up a device that requires a different voltage to that of 12Volts.

I will look around for a small inline voltage converter that suits the required specification.

Actually its 8.4V 1.4Amps.

Take care and if all goes well will post the pictures of the successful install.

Regards Exup
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Old 02-19-2008, 02:13 AM   #7
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Re: Electrical wiring question - 12 volts to 9 volts

You can reduce voltage by applying resistors in series and parallel with the load, as displayed in the link Steve provided -- but this doesn't provide a stable output. Rather, it pulls off X volts, depending on the resistors used. The problem in a bike/car charging system is that the voltage may range from 9-14 volt depending on the battery and the load on the system -- which may be too much variation for your device.

For any kind of voltage sensitive devices, a voltage regulator is the way to go. Here's a little clearer page on building your own regulator, and you can make one for a couple bucks in parts.

If building circuits isn't your thing, then finding a suitable car adapter is the way to go. If your bike doesn't have a cigarette lighter jack, you can open up the adapter and run your own wire off the circuit board and either hard-wire to the bikes electrical system, or - better - terminate in a (polarized) plug of your choice with the mating plug wired into the bike. A 2-pin SAE plug is a good choice, as its polarized and one side is insulated so there's no worry of the plug on the bike side shorting against the frame when it's not in use.
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Old 02-19-2008, 01:07 PM   #8
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Re: Electrical wiring question - 12 volts to 9 volts

will 3 volts really make a difference? i mean is it enough to fry a camera or the GPS?
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Old 02-19-2008, 03:16 PM   #9
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Re: Electrical wiring question - 12 volts to 9 volts

Quote:
Originally Posted by Skywalker View Post
will 3 volts really make a difference? i mean is it enough to fry a camera or the GPS?
YES as voltage drops amps rise. Amps can cause heat and heat is unused engery and can kill/damage most gagets.


BTW anyone know how many amps it takes to stop a heart?
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Old 02-19-2008, 05:26 PM   #10
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Re: Electrical wiring question - 12 volts to 9 volts

At the proper voltage, just a few milliamps----as in defibrillator...
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