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Now, very secondary. I do not advise experimenting with thinner wire for L1! Only such as shown in the diagram. To increase communication in the secondary housing may be deprived of his isolation. Only varnish coat. Otherwise darkened copper. But she quickly darken when voltage flows. Just beautiful when naked copper shines. I like that. A distance from the primary of the secondary should be 1cm no less and no more. If more, the coupling coefficient will be worse. If you get too close - to flash will burn the transistor. The winding pitch - half a centimeter. I - 4 turns. This is enough. Now resale. It is wound on a white plastic tube of sealant. And the diameter and height appropriate. And do not need to saw off. Only the neck with a thread cut. I experimented with different sections of the wire. I turned and 0.34 and 0,57mm. But the best results Kacher shown on the section of the secondary wire to 0.34 mm. The current in the coil gives streamer is not so big and not so much the transistor is loaded. A streamer when you put your fingers to it, it turns out like an octopus, stretched to sacrifice their tentacles, with yellow lights on the tips. Cool. Just to achieve the effect of long streamers with yellow lights, you need to pick a primary on the secondary housing almost in the middle of. But watch out for the resistance R1! It is better to be positioned in such a way and have to adjust R1, starting from the largest resistance. If not, leave the bottom of the secondary a primary traditional. Now debugging power. Because the mains voltage in the homes we have, to put it mildly, different, adjusting the bias voltage of the transistor base R1 so that the buzz was gone streamer and started banging. If the buzzing, the potentiometer resistance R1 enough. The bias voltage is large and the transistor is strongly heated. If not included Kacher - resistance is high. It is necessary to choose the resistance so that the crack was, but did not disappear when we offer a hand to the streamer. The fact that the system is very unstable, and the operating frequency is changed when we hand a tray due to changes in the secondary container. That's all. Finally I can advise, to get all the same, a few transistors. Because, certainly slept transistor. It will not work the first time. I burned them about thirty, is learned when setting up, feel Kacher. Fortunately, they have, in Khabarovsk on 42 ruble all. Why do most? Yes, because I'm experimenting with expensive IGBT-transistors even! That is they are about-ho-ho! 430 rubles a thing! A burn instantly. Very naughty. Although the base voltage (Gate) have 20 volts unlike MJE13009 its ... 9 volts.
Now, consider the scheme of the same Katscher, but on mosfete IRFP460. About mosfetah (FET insulated gate), I can say only one thing: moody bastards! But! All the same, if they apply, and rebuild the circuit, they are much more effective than their relatives on the semiconductor pantheon - bipolar tranzyukov. These higher frequency, more linear at higher frequencies. They are more like radio engineers like to say: "light" control electrodes - closures, Lighter than bipolyarnikov. And a big carrying capacity, as managed by the FETs are not current, bipolar and live. And the output - current. And the current sickly! Here's a, a controversial art. A total of one. Bipolar transistors are more cheap. Therefore, for the novice - what you need. Yes, and not only for Kacerov they are not bad. I, at first, they are well used for half-bridge circuit coils. But All the same, the field effect transistor in Katscher - it's something! Well, in this my circuit, I used a little IRFP 460. But the best result (the length of the streamer) can be achieved mosfetom with the letter "H". As you can see, the circuit, or rather, its ratings, in fact, differ substantially from those published in the net. For what it is they have done, I think, to guess ... you do not repeat their scheme. I'm working out their schemes and experienced. I have "all the moves written down." Schemes of my true. Sam changed the denomination, he soldered itself felt. Good luck to you ;-)
Most schemes Kacerov published in the net, unfortunately, are often just outside. This occurs for several reasons. First: the reluctance to share proprietary others. Second, theoretical speculation, often confirmed by experience. Take a little bit from one scheme to another. They write that he has developed. As a result, others burn out expensive transistors, then you begin to understand, "and the king is naked!" .... That, and I went in the same experienced by trial and error. And I came to the amusement results! Crystal transistor working in Katscher as an electronic spark gap with a reversible breakdown, behave quite unpredictably. But! I still was able to identify the writings of some of transistors and their patterns of burnout in such an unstable device! No Mosfety or IGBT can not withstand such barbaric modes! Only bipolyarniki! And among them, the greatest resistance to fading and maximum stability to multiple inclusions have a high-power switching bipolar transistors MJE13009. Not to be confused with ST13009, or with other letters ... By the way, the base voltage ST13009 seemingly 12 volts, unlike MJE13009 with his 9 volt base-emitter voltage, however, MJE has shown downright Spartan endurance to burnout. No, of course, and it is lit, but rarely. But! Transistor necessarily put on the radiator! And gently, gently adjust the potentiometer R1 the bias voltage of the transistor base. Resistance to do the maximum, include food and gradually begin to reduce it, do not forget to put next to the coil neon lamp for indication of the beginning of work Katscher without streamer. If Kacher and not included - reverse the polarity of the primary, do not forget to put back the maximum resistance R1 (lower position of the arrow). Powered only by the autotransformer 110 volts. No more! Lights transistor at a higher supply voltage ... As much as we have reduced the bias voltage, the transistor, or simply not turn on, or immediately burn. And just such a diode! If less current bet - burn, make a short-circuit and will burn the transistor ... And another thing: Rectifier - just such a half-wave. He plays the role of a voltage divider, and most importantly - breaker. Expense of this and a bit crackly and beautiful. Bet-wave rectifier and "broom" discharge is quiet, fluffy. And it will be very warm transistor! In general, any effect. Just rush to break off.