how to check if volt is 14 or 18v ?

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Hello guys
i need a circuit to check the out volt of a receiver if its 14v or 18v

ur help will b appriciated
 

you should use comparator and compare your voltage with 14 and 18 volt. there are many comparator in market.
you can use opamp as a simple comparator.
 

If you want a visual indicator, and the source you are drawing from has sufficient current, then you can use a zener diode and two led's.

The first led lights at about 13V. The second lights at about 16 or 17 V.

Screenshot:

 

thx guys i want to indicate both volts so when i have 13v i want a led & when 17v i want another one to insicate but the other goes off
 

A transistor can serve to alternately switch between 2 led's.

Screenshot:



The single diode may need to be 2 or more diodes in a string, to prevent LED 1 from lighting dimly when it is supposed to be dark.
 

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