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A few final thoughts for you:
> sometimes the amp draw goes down; but at the same time the light intensity goes up.
Yes I saw that. I made reference to the burn time, and you also have to consider the burn current, and the nature of human perception and how you (or the camera) perceives brightness. If a small part of the burn time is of much higher current, then that may be perceived as brighter, even though there is less average amp draw.
Final thought: 2 centimeters equals 40,000 volts.
Drevtoobe 3 years ago
Thank you for the insight. If the burn cycle comes down in the coil, why does the frequency increases the more lights are added?
Relation frequency to burn cycle in coil?
OK, that explains why on average my sparks is only around 2mm.
Borrowed HV probe, will go to Bangkok for my own later this week.
I am editing next video with more regarding spikes and scope effects; and swopping polarity.
Aromaz2012 3 years ago
> If the burn cycle comes down in the coil, why does the frequency increases the more lights are added?
I can only give you a general response: Adding more CFLs shortens the burn time, and this shortens the cycle time of the oscillator, increasing the frequency. In addition, the inductance of the coil, stray capacitance, stray inductance, and the gain of the transistor circuit all affect the frequency of oscillation. It can be mathematically modeled and crunched out on a computer.
Drevtoobe 3 years ago
Mat?, no it is not a mat - just PVC sheet because table top is less than presentable.
20,000 volt - I would he so happy! These coils has a maximum output of 8,600 (? or 6,800 ?) volts. I used a friends HV probe nearly 10 days ago; that is why I bought 4 coils. 2 each from two different dealers. All 4 were within 100v output on same circuit. At present - as per all these video's - the actual input to the coils were around 8.4 to 9.1 volt.
Aromaz2012 3 years ago
Okay for the mat, it looks exactly like a conductive anti-static mat.
Yes the dielectric breakdown for air averages 20,000 volts per centimeter but this varies based on pressure, temperature, humidity, etc.
You have a HV probe, good for you. Very good thing to have.
The maximum voltage output for your coils is determined by many factors, including the nature of the input signal and the load. I won't get into the details but yes, chances are the voltage at the 2 CM spark gap was around 20KV.
Drevtoobe 3 years ago
Drevtoobe - Thanks for the interest and all input Pos or Neg is always welcome AND appreciated.
Amp draw is not on this stage important for me. I amfter certain effects and manifestation of results. Will do power tune on later stage. Observed and noted.
Any more info will be appreciated. However the more interesting thing (see more of this in later video's) sometimes the amp draw goes down; but at the same time the light intensity goes up.
Aromaz2012 3 years ago
Hi Aromaz,
I will give you a very brief and simple explanation for why the amp draw stays the same. Something for you to ponder as you do your experiments.
The coil will output a fixed amount of energy for each flash (a.k.a. 'burn') of the CFL(s). Therefore it draws the same amount of current from the battery if there are one, two, or three CFLs in the circuit.
When you have two CFLs the time for the burn is 1/2 as long as a single-CFL burn, for the same total energy per burn.
Drevtoobe 3 years ago
When the burn happens, the limitations of our human visual perception make it appear the the CFLs remain at the same brightness. In fact they do remain at the same brightness, but the single CFL will burn for twice as long, and we can't see that.
I am not 100% certain of what I am saying, but I am very confident. Eventually you will be in a position to measure the 'burn time' with your oscilloscope an confirm or deny this. I don't think the CFL voltage will damage the scope, to be confirmed.
Drevtoobe 3 years ago
Very nice setup Aromaz. So do you want to understand why the amp draw remains the same for 1, 2, or 3 bulbs? I think that I can explain it to you and you have the means to confirm it with your oscilloscope.
By the way, it looks like you have a conductive anti-static mat on your table. Do you have it connected to ground? That mat is designed to protect chips, but it may not be wise to use it if you are working with high voltage.
Sparks through air happen at 20,000 volts per centimeter.
Drevtoobe 3 years ago