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Problem with offset value with IR transmitter

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Miltaridis

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I am trying to drive 3 ir leds from an ic using the following schematic :


This seemed to work for a while but at my receiver i am getting a strange offset value as if the transistor cant turn the led's truly off at any time. Any ideas ?

I tried with another trasmitter and the receiver works fine
 

Re: Ir transmitter help!

it mite help to have a 1k resistor in the base cct of the transistor :)

Dave
 

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