GETTING 9 VOLTS FROM YOUR ONBOARD 12 V BATTERY

[Lucky489]

No site linked

[ferociousllama]

You should use a LM317T. it is available for $2.29 from radioshack. Link to product:
http://www.radioshack.com/product/index ... 062601&cp=


Then calculate what value of resistors you need. Here is a calculator:
http://www.cpemma.co.uk/317calc.html

If you are looking for 9 volts 50 ohms for resistor1 and 310 ohms for resistor2 should work. Then wire it up according to the diagram on the page.

Good luck.

[jplock]

I did the same thing with radio shack's LM317T voltage regulator. It works great!
jplock

[ferociousllama]

What resistor values did you use? There are a couple of combinations that will get you the correct voltage.

[jplock]

I went by the schematic on the package and used a micro potentiometer to adjust the voltage with a small screw driver and volt meter. Mine is vairable 0 to 12 volts.
jplock

[ferociousllama]

use 50 and 300 ohms and it will be about right.