Change PNP transistor to NPN

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minh

Joined Nov 24, 2010
41
Dear All,,
I would like to change transistors for detect ion positive from this circuit (please see photo) but not working.Could you help me to correct what I wrong please more detail or new other schema is better (I am new in electronic) Thank you so much
 

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#12

Joined Nov 30, 2010
18,224
You are supposed to keep the collectors and emitters in the same places, just use the other polarity of transistors, and reverse the voltage of the power supply and the LED while you're changing things.
 

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