You can prove this to yourselves by feeding a Tesla coil direcly from a signal generator that you can adjust, which I've done. (in terms of circuit elements, the weak coupling produces an effective higher turns ratio that is much higher then the actual one, so the secondary resistance reflected to the primary is very small, and a small resistance in a tank circuit means high Q, which translates into a narrow bandwidth filter, if that's the use.)īottom line: a Tesla coil is a resonant transformer with an integrated transmission line formed by the long secondary. If we were highly coupled, like in a transformer, then we would have a broadband energy coupling device. And yes, the weaker the magnetic coupling, the narrower the bandwidth in these tuned systems. I agree with what EX is saying as well: at resonance, we can transfer ENERGY almost at 100 % minus a few losses, so just because magneticaly we are weakly coupled (10% perhaps) does NOT mean that energywise we are weakly coupled as well. At high frequencies, when the length of the wire starts to approach 1/4 wavelength, the voltage builds up to realy high levels due to the high quality of a transmission line which has very low resistance if designed correctly. It's unconventional because it behaves more like a transmission line at higher frequencies, than at lower frequencies.

As a result, the bottom section of the secondary develops a small voltage by induction and this voltage then resonates the rest of the secondary coil in an unconventional way. It's enough? (I'm not an electircal expert, please forgive me if I asked stupid a question, or just forward me to a beginner forum.Quote from: EMdevices on, 04:14:01 If I can jump in here real quick, I think I can shed some light on this topic.Ī Tesla coil at the bottom has the primary loosly coupled magneticaly to the bottom of the secondary coil. This is for protect the psu from a reverse polarity charged capacitor fr example? The original schematic, this is a low current diode. But this isn't good for the voltage stability. For example, how can it discharge a loaded capacitor on the output? I'm interesting this protection, because I use my psu to slow charge my accumlators. Or you can limit the maximum voltage with a trimmer potentiometer series to the voltage adjust pot. Isn't it? What about to use a Shotky diode? It have only 0,3V drop. 1n5402 protect the 2n3055 transistors, but how to protect U2? In a switched off PSU, current can be flown from the output througt D10->R15 and into U2 output.

2n3055 transistor circuits dr r draw