Inject energy - Questions

This is a good opportunity to wish you a Merry Christmas and a big thank you for this great EC site...I am sure that I can speak for many here.

How do you add a polarized capacitor with EveryCircuit?

Thank you @2ctiby.

No polarized capacitors in EveryCircuit at this point, @voidicle. Can you use a regular capacitor?

@Igor you're the best! Your app is the best! I have a question if I may. Do you plan on future incorporation of vacuum tubes in the app. That would be absolutely amazing!

I believe all of these questions can be answered my simple mechanical example. Take a swing for example. You push it once, and it starts oscillating between one maximum and the other. After some time, it loses strength and the oscillation starts fading. In mechanics it's mostly about friction, in electronics it's about resistance. If you want to turn the process from decay to increase you have to add energy (kinetic in the mechanical example, electric in our case), at just the right moment to increase the amplitude. Timing is important because opposite vectors cancel and unidirectional vectors sum. So if you add energy in one direction, while the swing is going in the other, you end up stealing some of the kinetic (electrical in our case) energy, thus reinforcing the decay process. If you keep the button pressed, it'd be like you keep adding potential energy to the swing, lifting it up higher and higher, but not actually letting it go, so it'll start converting potential energy into kinetic. Same applies to our electrical example. And yes you can inject both voltage or current in a similar matter, as long as the timing is right, but when you inject voltage, you essentially limit the maximum swing to some level, because as the voltage of the parallel LC circuit increases the potential difference between the LC circuit and the power supply decreases, thus at some point the difference will be 0V and no current will flow. A current source will theoretically keep increasing the voltage it supplies, to always maintain the same current that enters the tank circuit.

Thanks @thebugger! We have diode, triode, and pentode vacuum tubes mostly ready. There is something else planned for the next update, but the following update will probably include the vacuum tubes. Please be patient :)

Right, in a mechanical pendulum, kinetic energy (moving mass) is like energy stored in inductor's magnetic field (moving electrons). Similarly, pendulum's potential energy (mass height) is like energy stored in capacitor's electric field (stored charge).

When additional current is injected, it flows into capacitor and not through inductor. This is because inductors oppose instantaneous change in current while capacitors are Ok with gradual change in voltage. So injecting current is like changing potential energy.

Best timing to change amplitude is when pendulum is momentarily stopped at full potential (capacitor fully charged). Best timing to introduce phase shift is when pendulum is moving at full speed (max inductor current).

Big concern for oscillator designers is phase noise. In time domain, phase noise impacts performance in digital circuits. In frequency domain, phase noise causes transmitted spectrum to leak into neighboring channels. It's good to know where phase shifts comes from. :)

Yep, you're awesome. Very excited for the tubes. But yeah the swing/pendulum analogy makes most sense.

No es exactamente así

Al conectar una tensión variable auna bobina aparecerá una corriente variable. La variación de dicha correspondiente generará una fem inducida o fuerz contreelectromotriz

Según la ley de lenz la fuerza contraelectromotriz se opone a la causa que la produce.

Por eso aparece un desfase de 90°

De echo la bobina ideal es un cortocircuito.

No comprende

Who said anything about noise? I will tell you about the noise: http://everycircuit.com/circuit/5724631172644864 @Igor, merry Christmas and good luck in the New year!

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