Step 4: Extra: other uses

Know when there is too much infrared waves in the area (the led will glow like mad!)
there are various experiments to try with this eg point a different red LED at it and see if  makes infrared waves, how about a flashlight?
This was just a fun experiment to do when your bored and has no actual usage and if it does its by coincidence i apologize for your wasted time XD
hey Maxx-on, infrared light is the base signal
I'm confused by the diagram. There are 2 diodes, one looks to be the IR input since there are arrows going towards the diode, but we are talking about a phototransistor, in which case where is the base (that is assuming that the others are the collector and emitter) connected to? <br> <br>Thanks for the help. <br> <br> <br>Maxx
It's a bit confusing, but the base is on the transistor itself. In diagram form, a phototransistor looks like a diode with two arrows pointing at it, since there are only two connections to connect to. It's third connection, is a light sensor, which picks up light, and pushes energy passed the junction. In fact, this is how a Solar Cell works, because it actually is one, It's just undersized! Hoped this helped you to understand.
I see. The terms phototransistor and photodiode are used interchangeably. I have seen some that are 3 pin and 2 pin. I just figured that 3 pin would be called phototransistors and the 2 pin called photodiodes. <br> <br>Thanks
nice and simple! hah!
Very nice. Simple. Love it! The original schematic has a note that a part is backwards, could you explain please? Or update the drawing please? Thanks AlDude999!
I drew the LED's polarity wrong. Just reverse the polarity if it dosnt light up to Infared waves. Thank you for your feedback!

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Bio: Im into electronics and computers so thats the instructables you will find frome me
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