Amateur Radio Theory Articles

IC 741 Tutorial

What exactly is an OPerational AMPlifier? Let's define what that component is and look at the parameters of this amazing device. An operational amplifier IC is a solid-state integrated circuit that uses external feedback to control its functions. It is one of the most...

IC 555 Tutorial

The 555 timer IC was first introduced around 1971 by the Signetics Corporation as the SE555/NE555 and was called "The IC Time Machine" and was also the very first and only commercial timer ic available. It provided circuit designers and hobby tinkerers with a...

Valve Basic Theory

Basic Understanding of Valves: The vacuum tube, in its very primitive form, evolved from the light bulb. Invented by Thomas A Edison in 1883, the incandescent lamp, had 3 basic necessities to operate: The Envelope, The Filament, The Vacuum The envelope is basically a...

Voltage and Current

We have already discussed two terms VOLTAGE and CURRENT. Now it is time to discuss them further. VOLTAGE is the term used to describe the electrical "pressure" or difference of potential that we spoke of earlier. Just as water pressure is the force in physics that...