Thread: 12 volt regulator question

The battery will have different voltages coming off it as it charges/cranks your car. I would personally splice into the convience receptical (cigerette plug)'s wires. That should provide you with a better source of power. Even better, use the 12v remote on your head unit if you have one. Some one else can help you more, but these are just my suggestions.

Originally Posted by julesbchillin

maybe someone can help me,I bought a tm-701l 7 inch screen frome ebay, the guy that sold it to me told me that this screen needs a 12volt regulator{that regulates voltage at exactly and no more than 12 volts,} I havent seen anything about this from any one else,is this true??and another thing could I wire a xbox directly to the batt. with one of those 12v regulators????

thanx alot ,Jules

Don't take this the wrong way, but I think you should search before you ask. There are many 12V regulators and regulated supplies out there and have been discussed quite a bit before. How much do you know about electronics? Would you be looking to go the DIY route or would you prefer to buy a solution? Here are my suggestions:

1)DIY:
You can always build your own regulators. There are different types of regulator types and they will matter. Learn about regulators here @ National Semiconductor. You could use a linear regulator, but you may not be able to run the screen while the engine is off (search, this has been covered).

2)Buy something:
There are plenty of regulators and supplies you can buy out there. People here swear by the Opus and if you have the $$$ it's probably worth it.

HTH

I wouldn't suggest splicing into the accessory line (cigarette lighter) receptacle either. If possible, you are almost always better off going to the battery and fusing the line yourself. AFAIK, in nearly all vehicles, the accessory line is fused at a fair amount of current and is NOT regulated. I can vouch for this in my car, but not all others.

nzKAOSnz:
The remote off the head unit COULD be regulated, but probably isn't. It doesn't matter much because it is not really designed to power anything w/ high power requirements. If it was, we'd all be using it for power and there wouldn't be as many questions here.

Originally Posted by julesbchillin

all I really want to know is does that screen {TM-701L]need the voltage regulated at 12volts.or will the flux in power(12 volts if the car is off, and up to 13.6 volts when the car is on)somehow screw up the sreen????I allready built a 12 volt regulator,but havent herd anyone else mention this with thier screen... I think its a pretty simple question

In short, yes you most likely need regulation. Most automotive electronics feature some sort of regulation in them, but in most cases LCDs do not. Consult your documentation or a spec sheet for input voltage variance. A likely value is +12V +/- 5% or so. In that case, you would most definately need regulation.

You may use the 12v off of your power supply to power the screen if you have enough current (amps) to spare for the screen. As far as the xbox is concerned you will likely need an inverter unless they have some sort of car kit for it. Does the xbox have a AC-DC power supply? I don't have one so I can't say for certain. If the xbox takes DC current, they you may be able to find a dc-dc power supply (like the kind for your discman) just make sure that it's the right voltage and current, as well as polarity to match the supply by your xbox.

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