Switch on npn transistor not working (Simple circuit)

Thread Starter

MrsssSu

Joined Sep 28, 2021
40
I recently bought KSP 2N2222a npn transistors. The picture that I attach below shows the layout. The base of the transistor is applied a 1.5V which turns on the transistors and light up the bulb very brightly. However, I got a bulb that is so dim. The battery power and voltage is fine because I tested it and the led light up so brightly. What did I go wrong here or the transistors are fake?

Thank you:)
 

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ericgibbs

Joined Jan 29, 2010
14,136
hi Mrss,
You should not apply a 1.5V voltage directly to the Base
You must have a current limiting resistors, you most likely have blown the 2N2222.

E
EG 887.png
 
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