If there was a way to increase/decrease the strength of the osacillations(not affecting its freqwuency), we could have modulated our voice into the tuning fork! AM!


ELECTRICAL RESONANCE

     Now, let's see, we had the tuning fork, we can vibrate or oscillate something in the higher frequencies, at frequencies we ourselves can no longer hear. YES, in an electrical circuit, a coil is like a generator and a capacitor is like a rechargeable battery. What if we connect them together, will they short out each other? Well, eventually but they will first feed into each other. The cap as a battery will energize the coil and the coil will swing it back to the capacitor. This is called a TANK circuit. it will oscillate when initially energized with a battery for example. When the battery is removed, it will whine down and stop. The interesting part: The cap and the coil sets the frequency! Increase the cap, the frequency goes down. Increase the turns on the coil, it does the same thing. So, we can tune the tank by either using a varicap or by putting a slug inside the coil which can vary its inductance. TUNABLE!



to be continued......BK