Selfrunning cold electricity circuit from Dr.Stiffler

[Spokane1]

Dear Dr. Stiffler and Fellow Associates,

I'm half way there with the neon lamp test. As you can see from the photo the lamp will brightly illuminate both internal electrodes. But when testing for the single electrode illumination I get zip when using the large GE D2A. Now if I switch to a smaller 4mm Red/Orange device then I get both electrodes illuminated on the single wire side of the AV plug. I then get a dim light on one electrode from the positive diode and then both electrodes are active on the negative side of the other AV diode. Perhaps my IN4148's are unable to deal with the approximate 300 V generated. I need to upgrade them as well as the switching transistor.

When I touch the GE 2DA to the single wire side of the AV plug my LED's drop to about 1/4 brilliance and the relative current drawn from the battery drops 25%. I'm holding the neon lamp with an insulated pair of electronic pliers. This circuit is certainly sensitive to load changes.

I'm still searching through my solid state collection for a better switching transistor. By Monday I'll just order the best I can find at Moser or Digi Key. The PN100 transistor recommended by KZEP4 only has a VCE of 40 volts. This circuit has exceeded that parameter already and is running at 60V. I'm sure a faster transistor with a higher gain will push that voltage even higher. It appears that the requirements of this circuit are the best of all worlds. High Gain, High Frequency Response (gain bandwidth product), VCE in excess of 200V and an Ic on the order of an Amp. Then when we get to that power level we will need an even bigger transistor. I suppose the maximum power limit for this circuit will be reached with the maximum useful saturation current of the Ferrite coil assembly.

The proposal of using a "Tickler" coil on one end of the Ferrite core to observe what is happening there is a most excellent idea. I shall employ that method shortly.

Thank you for your useful comments, May the experiments proceed.

Spokane1

[amigo]

@RStiffler et al.

I'm wondering, what's so special about the 1.524MHz frequency, it keeps popping up and apparently my coils will only produce HV at it so far, both the original AM flat ferrite and now this custom made one?

The custom coil is on a cylindrical ferrite, something similar to Stefan's but just shorter. Its main winding has almost 2.6mH while the secondary on top is about 5uH, and it syncs at 1.524MHz. Moving the secondary around can tune for the brightest LED effect/highest HV output as well.

Funny thing is that I used 2N3904 with hFE of 135 originally and did not get the HV effect. Then switched to a spare 2N2222 with hFE of 150 and HV effect kicked in. Oh, and I only have a 10nF from base to the original secondary, I had to remove the limiting cap across base/ground to get this to work.

What I can conclude from observation and testing is that the smaller winding on top of the main one has to be in the range of couple of uH around 4-6. The first one I made was 12uH and I did not get anything, frequency was about 800KHz, but then I used a shorter length of wire and it started working.

Sorry no photo this time, my camera is away. Tomorrow when I have it back I'll take the photo of the board and the scope screen.

[hartiberlin]

I said in my last video the wrong oscillation frequency.
It was not around 300 to 500Khz but 5 times higher,
asI forgot, that I had my 5x stretch knob engadged !

Sorry, so my oscillation frequency was really in the range of about 1.5 to 2.5 Mhz.

Hope this helps.

As I see, that Dr. Stiffler now also uses 2.45 Mhz ,
I maybe be at the right track !

Also my neon bulb lights now up very much more at the
litz coils !

Regards, Stefan.

[jcims]

UPDATE: Well, I tried another radio and the same thing happens.

Hi Dave!  Have you tried introducing a permanent magnet into the vicinity while the AM radio is in feedback?  Stefan's video of the effects of a magnetic field in the vicinity of the coil was interesting, and i'm wondering if the microphonic effect is due to acoustic disturbance of the circuit, or if it's picking up a field from the speaker driver.  You might also be able to test it with some earbud headphones off of the radio.  Put one in your ear and the other one backwards near the coil to see if it picks up the small driver in there.

Just a thought..feel free to skip it!  

I'm not sure i know what i'm looking at, but it's an interesting thread nonetheless!

[scorpio]

Hi Guys!

I built and modified Dr. Stiffler circuit. Here is a pictures and schematic this circuit. I connected the "antenne" (1m wire) to the output then LED light has been brighter.
The added coil output voltage is 400Vpp! (see the scope pic)