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IR led and photo transistor circuit

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maxim10373

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hello
I have a small project which is need to negative switching. Is negative switching possible with IR sensor ?
IR Led with photo transistor circuit readily available .
 

A phototransistor works similar to an NPN. The obvious circuit to build is a common-emitter amplifier. It inverts the signal (light shining). Which is to say it provides a path to ground. Is that the kind of switching your question is about?
 
Hi,

What do you mean with "negative switching"?
I don't have a clue what you want to achieve and why .... and what's the exact problem.

maxim10373 said:
IR Led with photo transistor circuit readily available .
Click to expand...
This is good for you. But what can we gain from this information? ...since we can't see the circuit...

Rarely that 1 and 1/2 lines of text can precisely describe a problem in a forum.
What about using a sheet of paper, a pencil and doing some drawings. Block diagram, a schematic, a signals...

Klaus
 
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