12 volt questions, how much is good?
LED burned up last night. Stunk pretty good. I get 13.1 volts when checking the voltage where a LED connects into a 921 bulb base. Question 1 Is 13.1 a good number? Question 2 If...
Forum Discussion
13.6 is normal.
First: LED assemblies come in two types.. Current limited and current regulated
IF a LED is designed for a max forward current of say 20mA.. Some companies will put a current REGULATOR in series with it..Set to say 19ma.. last a long time and works well with anywhere from like 9 volts to around 30
Some put a simple current limiting resistor in the line.. and to make it brighter go a bit low on the resistance,, Leading to the current going very high, 30,40,50 mA.. and that leads to burn out.
First: LED assemblies come in two types.. Current limited and current regulated
IF a LED is designed for a max forward current of say 20mA.. Some companies will put a current REGULATOR in series with it..Set to say 19ma.. last a long time and works well with anywhere from like 9 volts to around 30
Some put a simple current limiting resistor in the line.. and to make it brighter go a bit low on the resistance,, Leading to the current going very high, 30,40,50 mA.. and that leads to burn out.
