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Activate LED when circuit broken.

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ApplePiePod

New Member
I wish to create a circuit. (How original)

Basically, when a phototransistor is not making the circuit (No light) I wish to have the circuit light a LED.

Simple.

I can't figure the 'if NOT made, light LED' bit.
 

marcbarker

New Member
I like your screen name apple-pie-pod:)

You'll not get anything simpler than this:
**broken link removed**

Note to Electronics course Professors, Tutors, Examiners: We're not really helping your Students to cheat, honest!
 
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birdman0_o

Active Member
Here's a good link I just found.
**broken link removed**
I think you can put the photo transistor as a voltage divider at the base of a transistor and it can work as a switch (Instead of using the op-amp).
 
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