Hello,
I am trying to teach myself some beginner elecronics by going through the book "Electronic Experiments for the Evil Genius". Everything was going great till I came to the transistor part.
I think my 3904 transistor might not be working as it should... Therefore I just did a quick test on my breadboard:
I connected 'collector' to a 9V battery and 'emitter' to a LED via a 470 ohm resistor and then to ground. Is it normal that it conducts and makes the LED shine, without applying any current to the base?
I don't think so, because it is an NPN and the book says they behave more or less like a normally open pushbutton.
The weird thing is that I tested it with three different 3904 transistors and they all have the same 'problem'. I tested the transistors for shorts between the legs but there didn't seem to be any.
Any help will be greatly appreciated!
Thanks in advance.
I am trying to teach myself some beginner elecronics by going through the book "Electronic Experiments for the Evil Genius". Everything was going great till I came to the transistor part.
I think my 3904 transistor might not be working as it should... Therefore I just did a quick test on my breadboard:
I connected 'collector' to a 9V battery and 'emitter' to a LED via a 470 ohm resistor and then to ground. Is it normal that it conducts and makes the LED shine, without applying any current to the base?
I don't think so, because it is an NPN and the book says they behave more or less like a normally open pushbutton.
The weird thing is that I tested it with three different 3904 transistors and they all have the same 'problem'. I tested the transistors for shorts between the legs but there didn't seem to be any.
Any help will be greatly appreciated!
Thanks in advance.