Thursday, April 19, 2012

Make: electronics book, Experiment number #10

Make: electronics book, Experiment number #10

Transistors 101.

Alright, im still not certain about capacitors, but i decided to move forward and perhaps i'll eventually come across a satisfying explanation.

This experiment was an introduction to transistors.

Very interesting and easy to use.

The experiment was very easy and for the first time, there were no problems!!
















To summe up what i learned, a smaller positive current is introduced to the base of a transistor, and it get activated and allow the bigger current to go through.

The more current is added to the base, the more current it let through.


Then the author of the book made us do something fun, remove the resistor that was limiting the current to the base of the transistor and replace it with our finger.

The current was getting through the finger, as showed in the video.

The closer the wires, the less resistance and the more the transistor was letting current through so the led was getting brighter.

All fun and games until i read the warning "don't use two fingers since it will let the current go through your body and it is dangerous" which i had been doing for the last 2 minutes.




A mistake from my part but this raised a question, why was the led so bright when i let the current go through my entire body? shouldn't the resistance offered by my whole body be pretty big?


Anyhow this was a fun experiment.


Looking forward to the next one!

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