IR LED ON when touch with hand

[CHAITHRA Y S]

Hi All,

I am using IR LED in of my application. Its Vf(min)=2.7V and Vf(max).7V. Initially the LED was working. After some few days it is not working. I checked for the dry solder, but there is no dry solder. But when I touch the IR LED with my palm it is getting ON. I am confused why it is behaving like this.

 

Pls help me out in this.

 

Regards,

Chaithra Y S

 

[Ashutosh Bhatt]

what is ur application?

what is ur circuit?

[CHAITHRA Y S]

Hi,

It is a simple LED on/off circuit by using N Channel MOSFET.

Regards,

Chaithra

 

[boopathy a]

Check the continutity of the circuit.   check the voltage at the IR LED terminal

[Anonymous]

Hi,

I am getting the Vcc voltage across LED. I think LED became open circuit.

If this is the thing, what may be the reasons?

 

Regards,

Chaithra Y S

 

[Ashutosh Bhatt]

post ur circuit

[Author]

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