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Pulse oximeter design: How to drive a bi-polar LED having two different forward voltages?

The first is how to generate a bipolar signal that is not symmetric about the x-axis. Imagine a square wave going 1.85V to -1.2V. … If so, I need all the advice I can get, especialy about how to drive a bipolar LED. Does anyone know some good literature I can read on the topic? …
Riley Hagerstrom's user avatar