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Jeff B asked How do I change frequency in DC electronics?

I don't see it in any of my basic guidebooks. Then how do computers process at 3 Ghz? Is that 5 volts AC running through the motherboard and processor? Why do microwaves rectify AC before putting it into the magnetron? How can I power a high-frequency transmitter from a battery? How can I choose the frequency emitted from a battery powered laser light?

And got the following answer:

What we are doing is using DC electricity to power a 'device' which produces AC electricity. In your computer, it is powered by 5v DC. There is a circuit in there, called an oscillator which switches on and off very rapidly (3GHZ ). It effectively chops up the DC supply into pulses 3 billion times per second. A magnetron is a kind of oscillator too. It needs DC to operate because it relies on the principle of accellerating electrons released from a hot filament (look up vaccum tube diodes). This only works in one direction, so we need DC to power it. The electrons' path is curved through a magnetic field which causes electromagnetic oscillations by some mechanism (something to do with the way the space charge of electrons 'bunches up' in some way I think) In a high frequency transmitter once again we have an oscillator circuit powered by DC power (nearly all electronics are powered by DC! Can you think of things other than motors, heaters and lights that run from AC? there arent many!). In our transmitter circuit we would have an oscillator, which produces an AC output when it is powered by DC. There are lots of different kinds of oscillators. A laser works by 'exciting' some molecules in some medium (maybe a gas, or maybe a solid semiconductor, a liquid dye etc) to store energy, then they are all 'stimulated' to release their energy as photons. (LASER is an acronym for Light Amplification by Stimulation Emmission of Radiation). A LASER is a kind of amplifier to operate at optical freqencies. Example in a laser diode (semiconductor laser), we excite the molecules by applying an electric current, just as when we power an LED. The frequency of the emmited light though is determined by some quantum physical process, the energy in the excited molecules is 'stored' in by moving electrons to higher orbitals, but they can only absorb or release energy at certain frequenies, which depend on the structure of the electron shells, so the structure of the molecule or atom in question. The simplest of oscillators (in theory, it wont work in practise), is just a capacitor connected to an inductor. If there is no energy in the circuit initially, noting will happen. But say that for some reason, initially there is some DC voltage across the capacitor (maybe we charged it before with a battery), or some current flowing in the inductor. Then, assuming there are no losses (resistance) in the circuit, energy will for ever move back and forth between the capacitor and inductor, the voltage across the circuit and the current through the circuit will be AC. The frequency depends on the value of inductance and capacitance. In reality, there are always losses though, so this circuit will not produce AC forever. (even if it had no losses, as soon as we tried to use it, any load would suck energy from it and the oscillations would die away eventually). Real oscillator circuits use an amplifier to amplify the signal and feed it back into the LC circuit to maintain the oscillations. http://en.wikipedia.org/wiki/Collpitts_oscillator There are other kinds of osccilator too, which dont use LC circuits but other kinds of non-linear circuits. A 555 timer is a simple example. http://en.wikipedia.org/wiki/Relaxation_oscillator Then there are a range of other devices to produce higher frequencies, microwave, light, x-rays etc http://en.wikipedia.org/wiki/Tunnel_diode http://en.wikipedia.org/wiki/Laser_diode http://en.wikipedia.org/wiki/Xray_tube alot of these higher frequency devices work on quantum mechanical principles (electrons, subatomic particles), rather than classical electromagnetism (voltage, current, magnetic fields, electric fields). Have a look at each one to understand why they must be pwoered from DC, and then how they use that energy to produce AC.


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