Led Or without Led??confiuse

hello guys…can anyone help me…i want to ask…is it possible to make oxygen saturation and measure heartbeat by using IR transmitter and receiver without Red Led…anyone have done it before?

Second, if i need the Led can anyone share the circuit can i used…

currently i am using this circuit…but i don’t know either can measure oxygen or not…

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Do not crosspost.

but its related to sensor...i want to make optical sensor by using led and IR tran n receive or without led...erm...

But you allready asked your question in other topic...