LM317T Voltage Regulator with Pass Transistor

After watching this video, you will be able to safety test alternator voltage output. This test can be completed using a basic multimeter (~$25). Multimeters are also known as VOMs (Volt-Ohm-Meters) or DMMs (Digital Multimeters). The surface voltage of a fully charged battery when a vehicle is not running should be between 12.5 to 12.8 volts. Most automotive batteries are lead acid 12-volt DC (Direct Current). Each of the six cells in a 12-volt DC battery produces 2 to 2.1 volts. When the engine is running, the alternator will typically put out between 13.8 to 14.8 volts. Cautions: Park the vehicle outside or connect the vehicle's exhaust to an evacuation system. Carbon monoxide is deadly. For more car care information, visit AutoUpkeep.com.



http://www.youtube.com/watch?v=Bzz7P3qNHcE&hl=en