resistor
Transistors - All about transistors
Submitted by shortphuse on Wed, 06/23/2010 - 13:19Transistors - 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
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Resistor colour code chart and how to use it
Submitted by Chris on Wed, 06/16/2010 - 15:57Resistor Colour Codes Explained
You may be familiar with the resistori colour code chart below... but what does it all mean? I hope this helps!
may be familiar 
The colours are as follows (in order):
- Black (0)
- Brown (1)
- Red (2)
- Orange (3)
- Yellow (4)
- Green (5)
- Blue (6)
- Violet (7)
- Grey (8)
- White (9)
The first two bands are the number to be multiplied, using the example above Red (2) and Violet (7)
the third band is the multiplier, or number of zeros to add to the first two band figures, using the example above Red (2) you add two zeros to the first two numbers.
The final band is gold, therefore the tolerance of the resistori can be + or - 5% of the value
