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The above is a visualization of an IR transmitter and receiver circuit I'm building. Sending a 2v and 1khz sine wave through a photodiode to a phototransistor.

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The figure above shows the outputs I get from running the simulation. I send in a sine wave(blue) and a squarewave(yellow) is what I get at the phototransistor output. At the amplifier's output, I get also a squarewave(green) on the negative side of the vertical axis.

My question is how do I get a better approximate signal of the input signal from the photodiode and the phototransistor?

  • Welcome to EE.SE! please visit the [tour] page if you have not taken the [tour]. Read [this post](https://electronics.stackexchange.com/questions/28251/rules-and-guidelines-for-drawing-good-schematics) which gives some tips for drawing easy to understand schematics. – AJN May 16 '21 at 09:02
  • Photodiode is intended to use as received, not transmitter. Lignt Emission Diode is transmitter. – user263983 May 16 '21 at 11:35

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