voltage indicator

Question

hi, i need to build a voltage indicator. 
 when the voltage will be 12V the led to turn green, 
 if i am lower than that i need the led to be red. 
 what parts can i use for this purpose?

FormerMember · Accepted Answer

aboico, 
 Put a 9V Zener in series with a green LED and a 10-30 ohm resistor. 
 Harry

EZAdministrator · Answer

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