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  1. B

    Drop voltage on transistor base

    Sorry my mistake drawing (12 v supply is right way in circuit). 12v LED is constantly on. I can't draw all the circuit. Its a UPS that's not accessible. Its remotely turned on but I want an indicator to show its status. The D1 Led is on the UPS(shows when battery is on).
  2. B

    Drop voltage on transistor base

    My problem is the base always has voltage.
  3. B

    Drop voltage on transistor base

    Hi I am using a NPN transistor as a switch. I am taking the base from a LED. My problem is their is a constant voltage of 1.87v when the LED is off(1.97v when it is on). I was thinking of a zener diode of 1.9v to drop the voltage but am unable to source one. Is their an alternative way? My...
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