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Transistor as a switch.

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  • Transistor as a switch.

    Hello everyone. This is my first post. Here is my doubt:
    I connected up both of these circuits on my breadboard. The first circuit worked just fine , LED turned on when the light detected. But the second circuit is not working . In the 2nd circuit, since the <p> <b> Base current + Collector current = Emitter current </b> </p> is true here, I found it reasonable for both LEDs to turn on simultaneously (when light is detected). But some reason (which you can make me understand ) both the LEDs are not lit.
    Thanks in advance.

  • #2
    Add small value resistance in base such as 470E etc & check it again

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    • #3
      Hi Mr.Jagdish. Thanks for replying. Unfortunately, it didn't work. Anyway, Adding a resistor to base.. wouldn't that limit even more current to base than previously.? And Wouldn't it reduce the current to the led at emitter even more..?

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