If you are just using the battery then no problem.  If the car is running
when you are using this it is another story entirely. The specs allow for
some surges that are very bad news. I bought a cheap inverter and get 110
VAC which I then feed to the standard wall supply brick. Works for
computers and saves expense of buying power supplies or the hassle of
building something.
If you really want to build something you want to block, swamp, and absorb
spikes and surges to protect your equipment. A 7812 will NOT reliably do
the job for you.


At 12:53 AM 3/15/00 -0500, you wrote:
>Of course it is, you just need to know the camera current consume at
>12V, so it will be easy to calculate the 12V regulator.  If you can
>ensure the battery will be at least 13V (1V above the 12), then it is
>easy to produce a transistor series regulator.  If the battery will stay
>around 14V constantly, then probably 3 "robust current" diodes in series
>will drop the voltage to the camera to aprox 12.1V... you just need to
>know the camera current consume.
>
>Wagner
>
>Tony Nixon wrote:
>>
>> Hi all,
>>
>> Does anyone know if it's possible to regulate a car battery supply
>> (usually 14V) to 12V. The video camera I am using expects a 12V 5%
>> supply, but I need to regulate the power to it from a car battery which
>> will be fully charged when used.
>>
>> --
>> Best regards
>>
>> Tony
>>
>> http://www.picnpoke.com
>> mailto:sales@picnpoke.com
>
>
Larry G. Nelson Sr.
mailto:L.Nelson@ieee.org
http://www.ultranet.com/~nr