Transistors - All about transistors
Transistors - I think it very remarkable how transistors suddenly appeared on the scene, and how in a relatively short space of time developed into the devices we have today.
The word transistori is made up from two words – transfer and resistori. First and foremost from outward appearances it has three legs, and these three legs have names, their names are; Collectori, Base and Emitter.
A small current in the base of the transistor controls a large current in the collector this gives us a device that can amplify signals, or can switch larger currents by the application of a small current in the base.
GAIN can be found by dividing the collector current by the base current and can be anything from a figure of 30 to 800
Shortphuse wrote a good blog entry about transistors. You can see that here: http://www.circuit-hut.co.uk/Transistors-blog<
In addition to that post I would like to add the following.
How a transistori works as a switch.
A transistor is basically an electronic switch, but because of how the transistor works it also allows signals to be amplified.
Transistors are used as switches for high current applications such as power supplies and also low power applications such as logic gates, where the output needs to be 1 (on) or 0 (off)