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Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
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Posts: 179
I built the circuit.
I wound my first primary 0f about 1.6 turns. This was a calculated number based of the frequency I am working with (270KHz or about so) and 0.68uF capacitors.
The primary didn't work so well so I wound a second one with 4 turns, no longer spaced out the coils as I did before. This one worked better. I dont know why, but apparently resonance is not that important here.
I used a telephone cable with individual wires tied together on the ends.
I connected the power side of this circuit in SERIES with a 60Watt light bulb to make sure it wont draw too much current. I used variable resistors for Resistors that connect to pins 11 and 12 on the CD4046. I gave myself an ability to plug different capacitors between the pins 6 and 7 of the PLL IC.
Values that were used were R1 - 12.05K - found empirically with a 100K pot R2 - 13.70K - found empirically with a 100K pot maybe I measured wrong because R2 always appeared to be bigger than R1
C1 was 150pF
There was a sweet spot when the streamer produced was as high as 2cm but it never got longer.
When I took the 60watt lightbulb (limiting resistor) out and replaced it with a 1KWatt burner from an electric stove, I got the same small streamer. Then I turned the knobs of my variable resistors a little and burned one of the mosfets.
When the circuit operated in the sweet spot it produced a minimal amount of light (voltage drop) on the 60 watt light bulb. So light bulb in series with the power side of the circuit was a good idea for tuning and this circuit will burn if it is not in the "sweet spot" and there is no streamer.
The longer the streamer, the lower the power consumption!
Now I am looking at this circuit: http://www.loneoceans.com/labs/qcw/ and thinking what the power consumption of it is. What is the efficiency of this device? It uses no PLL so this idea of using PLL to drive Tesla coils is not proven to be effective ? How much work is required to produce streamers?
Why couldn't I get a longer streamer out of my coil? If primary resonant frequency is not so important, what is? Coupling is bad in tesla transformers.
I am using the cheaper, older TI 4046 so it has different resistances, capacitance requirements to get a specific frequency range. TI is the same type of IC same pinout but different resistance and capacitance requirements...
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CD4046 datasheet, R1 and R2 and C1 that determine frequency range of this IC.