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?
It looks like you need a couple of comparators. You will have to set them up to control one or the other LED and or turn on a power supply for the LEDs. Let me know if you have specific questions about the parts.
The ADMP356 may be useful
Depending on how much current you need a linear regulator or a switching regulator could also be used/ Something like the ADP7104 or ADP2301
thanks for you answer
but the ADMP356 needs Vcc and i dont have the option to work with is because it is an individual system.
as a matter of fact i want to spin a hand crank generator and indicate when i get 12 volts
Put a 9V Zener in series with a green LED and a 10-30 ohm resistor.
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