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Messages - Peregrine
Pages: [1]
1
« on: April 02, 2024, 10:59:53 AM »
hi, when sizing the tank capacitor, the impedance of the NST transformer is calculated which must be equal to the impedance of the tank capacitor: why? Thank you
2
« on: September 23, 2022, 02:01:10 PM »
Hi, how could I measure strong magnetic fields? i made a circuit for PEMF never hall sensors that i have fail to measure it ... in practice it is an LC circuit with C = 60nF and L = 3uH thanks Angel
3
« on: March 03, 2020, 09:05:48 AM »
Hi, how can I know a chain of Villard multipliers, how much current can it deliver? it just depends on the capacitors? how can i calculate it? thank you
4
« on: March 01, 2020, 03:03:44 PM »
thank you David for your answer and competence. I would also use another circuit, but in your opinion, with the electronics you are talking about, you can get large peaks of energy (30.50w) discharged on a coil in a few microseconds or better, nanoseconds? or are there other techniques? thank you
5
« on: February 29, 2020, 05:32:24 AM »
I detected this signal with a probe, what does it make you understand? What are those peaks on each ridge? It is not seen well but at the beginning of the oscillations there is a signal of 17mhz while the resonance frequency is about 400khz
6
« on: February 19, 2020, 07:29:23 PM »
I have a probe that reduces the voltage read by 1000 times ... do you think I could use it to connect it to the oscilloscope to see the signals? or to read the currents at stake?
7
« on: February 19, 2020, 06:47:55 PM »
do you know if there is a circuit in LTSpice that can simulate a sparkgap well? it would be very useful ...
8
« on: February 19, 2020, 06:45:23 PM »
You haven't told us what you are trying to do with this circuit. If you are only charging and discharging this capacitor infrequently, once a minute for example, I would disconnect the power supply from the circuit before firing in order to protect it. If this is firing rapidly then obviously you can't do that and will have to rely on the charging resistor for protection.
the capacitor does not charge and discharge it once a minute but continuously, as I said, even for 20 minutes ... in fact the resistance heats up a lot but now I will try to divide it into more values to have less power dissipated ...
9
« on: February 19, 2020, 06:54:14 AM »
Thanks friends for your advice ... I looked better at my circuit and saw that, since I had already burned many, I had put 2 40kv capacitors in series, thus obtaining a total value of 80kv 5nf ... So the problem I don't think it is the sizing of the capacitor ... Keep in mind that during the discharge a discharge bang occurs so strong that at 1m away the ears hurt ... therefore it may be that this kind of condenser is not suitable for these discharged or is it another problem? I add that the device must be kept on for at least 20 minutes, ... For a short time it is good for over 20 minutes it is not reliable
10
« on: February 18, 2020, 08:27:31 PM »
Ceramic doornknob capacitors with a 50kv 10nF rating are uncommon. Do you have a picture you could share? I suspect that the capacitor could also be unsuitable for tesla coil use.
11
« on: February 18, 2020, 07:32:04 PM »
If this is the schematic for a spark gap coil, you need to swap the position of the capacitor and spark gap. I don't think this is causing your capacitor problem but it could cause problems for your transformer. As Mads stated, it sounds like you are exceeding the voltage rating of your capacitor. You want at least a 2x and preferably a 3x voltage rating for your capacitor.
no, the position of the sparkgap and coil are exact. This circuit is not to make a tesla coil but a therapy device with pulsed magnetic fields (as in the picture)... and then I don't use a transformer as a power supply but a 30-40.000v direct current generator. then for the voltage of the capacitor maybe you are right but I used doorknob which told me that they are not really suitable for fast impulses while I should take the polypropylene ones, but apart from this problem, would you have other tips to avoid damage? I stand with Steve about it being easier on the transformer to drive across spark gap instead of across capacitor. Maybe not a lot easier, because of the 10M resistor.
As Mads said, there's more to learn about how you are abusing the capacitors, or if the capacitors are over-rated fakes (?).
What is the RF current in each spark, the tank circuit energy, and the average power?
Power input is partitioned somehow between losses in L, C, and spark. Do L or C get hot when you operate the circuit at power below the destructive level?
the power is less than 10J, but before the capacitor broke, I saw a flash of lightning go through it ... in tesla coils, a so-called "terry filter" is often used but there is an alternating transformer and it is used to avoid RF or that could damage it, instead mine is a DC circuit....
12
« on: February 18, 2020, 04:19:37 PM »
the capacitor is a doorknob 50kv/10nf , I need a quick discharge on the coil... the oscillation frequency is about 500khz but the discharges on the sparkgap are few hertz
13
« on: February 18, 2020, 10:40:58 AM »
Help! Hi everyone, I need to use this circuit, but after a while the capacitor burns out! the power supply comes from a voltage multiplier, and the capacitor is 50kv 10nF, the coil 10uH what can I do to protect it? thank you.
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