N.R.M.R.E. An investigation.

[Jimboot]

These traces are much more fun.

[evostars]

I always thought my oscilloscope was old and broken when i saw those multiple wave forms. Hmm. interesting.

[evostars]

Good deal Grum.

First step is consider why you would want one of these:
https://www.youtube.com/watch?v=QiCD2LJjA-A

Second step is to make good use of it.   

Yeah I have been wondering about that cirquit, anybody now how?

I came to the conclusion (not the circuit in the vid but it will spike), I will need to build a auto ignition coil, but as a air coil, so it will work with high frequency.
Basicly, a coil in a coil. the outside coil is magnetised with DC. Then with a circuit, the DC is interupted, shortly. The collapse of the magnetic field will induce a big spike into the inner coil. that coil will have only 1 connection out, through the driven coil, to ground.
High voltage, low current spikes. a radio frequency ferrite rod might help.

If the circuit in the video is known... man, i would love to see it! I fail to see how a low frequency relais, can generate such high frequency spikes.

[TinselKoala]

Those scopeshots showing overlapping waveforms are telling you that your signal isn't strictly repeating, but is changing in timing and/or voltage, and the scope is "multiple triggering" on different parts of the unstable waveform. If you can't get it to settle down by adjusting the Trigger level, type and/or slope, the way to get a stable picture is to use the Single Shot mode of the scope. When you see something like that, press the Single button at top right on the Rigol z-box and the scope should capture one triggered sweep with no overlaps. If you have a deep memory set in the Acquire menu you can then scroll around, zoom, use cursors, display measurements etc. on the stopped trace. Then you can press Single again and the scope will likely trigger on a different part of the unstable waveform. To see how the signal varies in time and voltage, select a slower timebase so you see a bunch of cycles, even overlapping. Then press the Single button and the single sweep should show the variations in timing etc. See the attached scopeshots for examples where I did this to display some irregular signals.

And it really is easier and better to use a USB thumbdrive and the "print" button to make your screenshots with the Rigol z-box.  Unless maybe you do all your forum work on your phone or tablet where you take a picture and then post directly from there, I guess. Seems a waste though since the actual screensaves have much more detail, are smaller filesized and have other advantages like always being in perfect focus and contrast....

(Yes, both these scopeshots were made using the NRMRE circuit which is the topic of this thread.)


As far as the relay buzzer circuit is concerned, what happens is that the relay isn't fully opening/closing because the coil is connected to the Normally Closed switch contacts, so as soon as the coil is energized the NC contacts start to open, and as soon as they start to open, a tiny arc forms at the contacts __because the collapsing field of the coil wants to keep current flowing in the same direction as before_. This arc produces high frequency RF noise just like the spark gap in traditional Tesla coil systems. It also dissipates energy. A little later in the cycle when the contacts open further the arc goes out and the rest of the stored energy in the coil's magnetic field produces a ringdown. If you could get rid of that arc you'd see less high frequency components and a higher voltage spike (because the energy isn't lost in an arc).  Some of these miniature relays have a reverse-biased diode already built in across the coil, this is not the kind of relay you want for this device. Putting a small value ceramic capacitor across the switch contacts can help to get rid of the little arc, which is good if you want the relay to last a long time but bad if you need the RF noise from the arc. The arc will eventually cause degradation of the contacts (they are usually made of extremely tough metal like tungsten) due to erosion and buildup of combustion products. The contacts can even weld themselves closed. You can use a diode and capacitor in the usual way to store up the energy in the coil's spikes, and then discharge that capacitor wherever you might find a use for the energy.

[TinselKoala]

... And here is MY version of the thing that evostars described wanting to build in his post above. An outer coil that is being fed fast rise-fall time pulsed DC (Tesla bifilar wound, even) , which induces high voltage in the air-core secondary coil, and the circuit automagically self-tunes to the 1/4 wave resonant frequency of the secondary + its tunable ferrite loopstick. So you get VRSWR (voltage rise by standing wave resonance) over and above mere transformer turns-ratio voltage amplification. You get E-field wireless power transmission ("scalar" wave), RF magnetic field wireless power transmission, one-wire power transmission, "HV Radiant" that will produce little arcs and plasma inside light bulbs, charge caps, ozone, stable operation, low parts count and portability (runs on batteries.)