Photosensitive resister On/Off Led circuit

Thread Starter

kongway

Joined Apr 12, 2007
12
I try to design a circuit (attached is my design) , using photosensitive resister to automatically turn ON the Led, when here are dark. Otherise Led are OFF. But some barrier was occur, i don't know how to fix it. So if any body have idea, please advise me and give me opinions about my circuit and the component value.

Thank a lot!
Kongway

Please find attached again
 

beenthere

Joined Apr 20, 2004
15,808
The image is very small and hard to make out. If the applied voltage is positive, the transistor is in cicuit with the emitter and collector reversed.
 

Thread Starter

kongway

Joined Apr 12, 2007
12
The image is very small and hard to make out. If the applied voltage is positive, the transistor is in cicuit with the emitter and collector reversed.

thank you beenthere,
Actually, i don't know my circuit is work or not and push 3 Led on brightly. So can you please provide a circuit to me?

Thanks again
Kwongway
 
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