[SOLVED] Making Led only light at 10v

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Shaam123

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Hello,

I have designed a 12v voltage regulator on a breadboard. I can adjust the voltage using a potentiometer. I want to add a led which lights up only when the voltage is 10v. Below that, the led is off. I want to use the led as an indicator that the voltage is equal or more than 10v.

I have attached a schematic of the voltage regulator I have used.
 
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Use LM431 on the output to switch and drive an LED.
 
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    CataM

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Would a 10V Zener diode in series to the LED work ?
 

Would a 10V Zener diode in series to the LED work ?
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The led has its own turn-on threshold, a few volts probably. Therefore the zener should be 6-7 V. You'll need to experiment with different combinations.

If you want convenience in adjusting turn-on threshold, the TL431 (as I'm pretty sure post #2 intends) is an adjustable zener.

Be sure to add safety resistors where needed.
 

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