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IR Transmitter Circuit

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UTMonkey

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Hi All,

I have been looking at Nigel Goodwin's PIC tutorial, particularly the infrared circuit.

I have attached the circuit but removed the receiver element as I am particularly interested in the TX.

I understand what it all does except for the reason for why R4 is brought to GND, a potential divider? why couldnt R3 and R4 be in series with the base of the transistor?

Thanks

Mark
 

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