A-King 21 - build discussion /investigation

[TinselKoala]

There are at least a couple of ways to use a PLL in this application. One would be to emulate crystal frequency lock-in so the device would only operate at that single frequency. I don't know what use that would be, as resonance frequency of a helical resonator depends rather strongly on the environment. So a better use of the PLL would be to keep the system in resonance by changing frequency as required. But the plain old Slayer/Kacher circuit already does this! 

As we have noted though, the base drive of the Slayer circuit is relatively sinusoidal and so does not result in the maximum dv/dt that one might like. I've considered putting in a Schmitt trigger between the Slayer feedback connection and the transistor base. Also a carefully chosen mosfet would probably be good there. So pretty soon we are evolving towards a real SSTC....
But I think a real Tesla disruptive discharge system is probably to be avoided here. Because you will get this kind of stuff happening from all metal in the vicinity: https://www.youtube.com/watch?v=aIZClhoU2Xk
Of course Master Ivo's DD system probably won't do that. 

[AlienGrey]

There are at least a couple of ways to use a PLL in this application. One would be to emulate crystal frequency lock-in so the device would only operate at that single frequency. I don't know what use that would be, as resonance frequency of a helical resonator depends rather strongly on the environment. So a better use of the PLL would be to keep the system in resonance by changing frequency as required. But the plain old Slayer/Kacher circuit already does this! 

As we have noted though, the base drive of the Slayer circuit is relatively sinusoidal and so does not result in the maximum dv/dt that one might like. I've considered putting in a Schmitt trigger between the Slayer feedback connection and the transistor base. Also a carefully chosen mosfet would probably be good there. So pretty soon we are evolving towards a real SSTC....
But I think a real Tesla disruptive discharge system is probably to be avoided here. Because you will get this kind of stuff happening from all metal in the vicinity: https://www.youtube.com/watch?v=aIZClhoU2Xk
Of course Master Ivo's DD system probably won't do that. 

No you mean Nelsons device he shared with Master ivo notice the way the circuit works as well below zero. and the bifilar caduceus /pancake wind of the bemf collect coil.
Back to you Mr Tinsel K

[TinselKoala]

Oh, no, no no,  I wouldn't dream of getting in between you, Rocha and Master Ivo. So y'all just go right on ahead, and when you get OU.... let me know.


Of course I mean this kind of OU : Joules in < Joules out.  Your mileage may vary.   

[a.king21]

There are at least a couple of ways to use a PLL in this application. One would be to emulate crystal frequency lock-in so the device would only operate at that single frequency. I don't know what use that would be, as resonance frequency of a helical resonator depends rather strongly on the environment. So a better use of the PLL would be to keep the system in resonance by changing frequency as required. But the plain old Slayer/Kacher circuit already does this! 

As we have noted though, the base drive of the Slayer circuit is relatively sinusoidal and so does not result in the maximum dv/dt that one might like. I've considered putting in a Schmitt trigger between the Slayer feedback connection and the transistor base. Also a carefully chosen mosfet would probably be good there. So pretty soon we are evolving towards a real SSTC....
But I think a real Tesla disruptive discharge system is probably to be avoided here. Because you will get this kind of stuff happening from all metal in the vicinity: https://www.youtube.com/watch?v=aIZClhoU2Xk
Of course Master Ivo's DD system probably won't do that. 

My beef with the Slayer is that you get too much parasitic capacitance. I suppose the way to use it is to keep a distance from it or maybe isolate it in a faraday cage. That is why I thought that maybe pll ing it or getting a crystal circuit may be a reasonable compromise, (unless you are transmitting and receiving).

[TinselKoala]

Well that's what you get with the E-field emitters. High frequency (in the Benitez-Tesla sense, single digit MHz ranges) + high voltage = capacitive coupling like crazy.
So my solution has been to go to lower frequency mostly EM coupling. Or, dare I mention it, hybrid devices with optimized geometry of transmitter-receiver pairs.

Here's me with a EM receiver antenna wrapped around my head, with an incandescent bulb powered wirelessly. 

Try that with a Slayer, or even RF's gatedriver coil setup. Or maybe you shouldn't, after all.