Author Topic: Help!Capacitor that burns out after a while!  (Read 11710 times)

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Help!Capacitor that burns out after a while!
« 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.

Offline Mads Barnkob

  • Administrator
  • Executive Board Member
  • *****
  • Posts: 2267
  • Karma: +71/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Help!Capacitor that burns out after a while!
« Reply #1 on: February 18, 2020, 04:12:11 PM »
It sounds like you are using a capacitor beyond its voltage, current or frequency specifications. Please provide all details about the application and capacitor.
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #2 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
« Last Edit: February 18, 2020, 04:22:20 PM by Peregrine »

Offline MRMILSTAR

  • High Voltage Senior
  • *****
  • Posts: 535
  • Karma: +20/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #3 on: February 18, 2020, 05:16:55 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.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 688
  • Karma: +22/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #4 on: February 18, 2020, 05:58:39 PM »
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?
« Last Edit: February 18, 2020, 06:01:35 PM by klugesmith »

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #5 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....
« Last Edit: February 18, 2020, 11:34:08 PM by Mads Barnkob »

Offline Weston

  • High Voltage Technician
  • ***
  • Posts: 132
  • Karma: +11/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #6 on: February 18, 2020, 07:55:14 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.

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #7 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.

Offline MRMILSTAR

  • High Voltage Senior
  • *****
  • Posts: 535
  • Karma: +20/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #8 on: February 18, 2020, 09:34:06 PM »
Even though this isn't a spark gap tesla coil I would still swap the positions of the spark gap and the capacitor. Doing so will make it less likely for any high frequency high voltage oscillations to get back into your power supply and possibly damaging it. From your schematic, the functionality should be the same other than the capacitor charging through the additional wire resistance of the inductor. The additional inductor wire resistance is negligible compared to your 10M ohm charging resistor.

I would want at least a 2x voltage margin on that capacitor. With a rating of 50 KV you aren't close. That flash that you describe sounds like the capacitor breakdown voltage was exceeded. Four of those 50 KV capacitors in series-parallel would yield a 100 KV rating with the same capacitance which would give you a comfortable 2.5x voltage rating.
« Last Edit: February 18, 2020, 11:00:30 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline ElectroXa

  • High Voltage Enthusiast
  • *
  • Posts: 35
  • Karma: +1/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #9 on: February 18, 2020, 09:44:25 PM »
Hi  :)

capacitor  failed maybe from resonance ringing, as this phenomenon boosts voltage and current in the circuit, leading to failure.
So I recommend you to use capacitors in series to have a large voltage  headroom, to avoid flashover, as for example using 2* 50kV capacitors in series to have a rating of 100kV.
I also recommend using pulse film caps as they can withstand high pulse current.  ;)

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 688
  • Karma: +22/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #10 on: February 19, 2020, 06:51:52 AM »
Just confirmed your estimate of ringing frequency, 500 kHz.
Associated impedance sqrt(L/C) is about 32 ohms.
That means that if spark gap fires at 32 kV, the RF current hits 1000 amperes in first cycle.
How fast does the ringing decay?  You could measure that with oscilloscope and a sense coil or pickup antenna loosely coupled to the tank circuit.

If spark gap fires at 32kV, initial energy in C is about 5 joules.
If a discharge happens 4 times each second, that would be 20 watts being dissipated in C+L+spark
(and I think another 20 watts in the charging resistor).
How hot do the R, C, and L get, and how fast do they get hot?


Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #11 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

Offline rikkitikkitavi

  • High Voltage Technician
  • ***
  • Posts: 127
  • Karma: +2/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #12 on: February 19, 2020, 10:43:13 AM »
Sounds like your caps are overheating internally due to the discharge currents and then something goes bang as it takes some time.

/Rickard

A man can not have too many variacs

Offline Uspring

  • High Voltage Engineer
  • ****
  • Posts: 344
  • Karma: +32/-1
  • Physicist
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #13 on: February 19, 2020, 02:03:12 PM »
Overheating seems a likely cause. Do you have ESR specs for the cap or a tan(d) ? If not, place a small pickup coil near the inductor and take a scope shot of the voltage. From the ring down of the amplitude you can get a rough estimate of the dissipation. You'll loose a few hundred volts amplitude in the tank for each cycle due to the spark gap voltage drop. At your high voltages, this might be a few percent initially. If the ring down is much faster, than the cap ESR will take most of the energy.

If that is the case, paralleling caps instead of serialising them might be the better idea.

« Last Edit: February 19, 2020, 02:07:44 PM by Uspring »

Offline MRMILSTAR

  • High Voltage Senior
  • *****
  • Posts: 535
  • Karma: +20/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #14 on: February 19, 2020, 05:52:20 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.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline Teravolt

  • High Voltage Technician
  • ***
  • Posts: 125
  • Karma: +2/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #15 on: February 19, 2020, 06:41:42 PM »
your capacitor is not rated for pulse duty if you can find some high voltage mica caps you will be better off. The foil atached to the ceramic slug on the inside typicaly will degrade with pulse duty on door knob caps. they are better for marxes or tripplers

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #16 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 ...

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #17 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 ...

Offline Peregrine

  • High Voltage Enthusiast
  • *
  • Posts: 12
  • Karma: +0/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #18 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?

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 688
  • Karma: +22/-0
    • View Profile
Re: Help!Capacitor that burns out after a while!
« Reply #19 on: February 20, 2020, 04:47:41 AM »
You don't need a probe that touches the circuit. 
I would question the accuracy of any ordinary 1000:1 voltage probe at 500 kHz.

As a couple of us have suggested,
* Any probe close to your pulser will provide a signal with which you can accurately measure the frequency and damping. 
* You can get the initial voltage accurately enough from spark gap geometry, or from known power supply voltage and measured repetition rate.
* You can get the first-cycle current accurately enough from voltage and tank impedance sqrt(L/C).
« Last Edit: February 20, 2020, 04:51:39 AM by klugesmith »

High Voltage Forum

Re: Help!Capacitor that burns out after a while!
« Reply #19 on: February 20, 2020, 04:47:41 AM »

 


* Recent Topics and Posts

post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
Today at 01:01:12 PM
post Re: Big Coil Build Log
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
Today at 05:47:34 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
davekni
Today at 04:45:07 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
Today at 04:18:27 AM
post Push Pull VTTC
[Vacuum Tube Tesla Coils (VTTC)]
janno288
Today at 01:10:08 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 27, 2024, 10:54:52 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
markus
March 27, 2024, 11:53:42 AM
post Re: OCD Triggering Early + Low Output
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 27, 2024, 05:14:36 AM
post Re: Is the UD2.7C under voltage lock out basically worthless?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 27, 2024, 04:47:48 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 27, 2024, 04:41:59 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 27, 2024, 12:04:34 AM
post Re: Super flat QCW simulation (does this look reasonable?)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
toooldforthis
March 26, 2024, 11:08:14 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 26, 2024, 11:07:20 PM
post Re: Is the UD2.7C under voltage lock out basically worthless?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 26, 2024, 10:46:29 PM
post OCD Triggering Early + Low Output
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
March 26, 2024, 09:03:43 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 26, 2024, 08:46:59 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 26, 2024, 05:02:18 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 26, 2024, 03:16:03 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
Anders Mikkelsen
March 26, 2024, 01:41:49 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 26, 2024, 04:48:22 AM
post Re: Re-chargeable 1.5 volt lithium ion AAA batteries
[General Chat]
MRMILSTAR
March 26, 2024, 04:16:37 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 26, 2024, 04:16:24 AM
post Re: Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
davekni
March 26, 2024, 04:13:02 AM
post Re: CM400 Induction Heater
[Electronic Circuits]
davekni
March 26, 2024, 04:00:43 AM
post Re: Re-chargeable 1.5 volt lithium ion AAA batteries
[General Chat]
davekni
March 26, 2024, 03:19:18 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
March 26, 2024, 01:50:42 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 25, 2024, 08:05:02 PM
post Re: Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
Mads Barnkob
March 25, 2024, 07:41:29 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 25, 2024, 06:45:46 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 25, 2024, 05:44:25 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
Anders Mikkelsen
March 25, 2024, 04:47:17 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
March 25, 2024, 04:27:22 PM
post Re-chargeable 1.5 volt lithium ion AAA batteries
[General Chat]
MRMILSTAR
March 25, 2024, 03:57:34 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
markus
March 25, 2024, 02:06:41 PM
post Re: Odd MOSFET Driver Behavior
[Solid State Tesla Coils (SSTC)]
KrisPringle
March 25, 2024, 04:43:25 AM
post Re: Odd MOSFET Driver Behavior
[Solid State Tesla Coils (SSTC)]
davekni
March 25, 2024, 02:39:40 AM
post Re: Odd MOSFET Driver Behavior
[Solid State Tesla Coils (SSTC)]
KrisPringle
March 25, 2024, 12:47:09 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 24, 2024, 07:36:32 PM
post Re: My completed 14-stage Cockroft-Walton voltage multiplier
[Voltage Multipliers]
Alberto
March 24, 2024, 07:27:24 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 24, 2024, 04:25:23 AM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 23, 2024, 10:47:35 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 23, 2024, 09:30:21 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 23, 2024, 04:34:31 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 23, 2024, 03:04:25 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 23, 2024, 01:38:34 PM
post Re: capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
MRMILSTAR
March 23, 2024, 04:20:03 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
davekni
March 23, 2024, 12:54:30 AM
post Re: Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
davekni
March 23, 2024, 12:05:57 AM
post capacitor and diodes. Voltage values for a CW
[Voltage Multipliers]
Alberto
March 22, 2024, 11:45:03 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
OmGigaTron
March 22, 2024, 11:30:09 PM
post Smoke Screen Machine Protect 950 XP - Teardown of a Smoke Cannon!
[Electronic Circuits]
Mads Barnkob
March 22, 2024, 10:20:35 PM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Benbmw
March 22, 2024, 09:21:13 PM
post Re: What actually kills MOSFETs?
[Beginners]
AstRii
March 22, 2024, 03:37:11 PM
post What actually kills MOSFETs?
[Beginners]
FPS
March 22, 2024, 05:09:20 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 22, 2024, 03:57:54 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 22, 2024, 02:59:25 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 21, 2024, 06:31:42 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
rikkitikkitavi
March 21, 2024, 03:08:01 PM
post Re: [WTS] IGBT, Ferrite, Capacitors, Tools, PSU, Industrial components and parts
[Sell / Buy / Trade]
Mads Barnkob
March 21, 2024, 01:37:32 PM
post Re: Difference between these transformers
[Transformer (Ferrite Core)]
Alberto
March 21, 2024, 11:42:07 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 21, 2024, 04:09:14 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 21, 2024, 02:15:31 AM
post My Homemade Structural Analysis X-Ray Machine
[X-ray]
Luca c.
March 21, 2024, 01:35:40 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
March 20, 2024, 10:40:00 PM
post Re: Difference between these transformers
[Transformer (Ferrite Core)]
Mads Barnkob
March 20, 2024, 08:03:41 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Mads Barnkob
March 20, 2024, 07:51:57 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 20, 2024, 10:39:47 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
March 20, 2024, 04:09:59 AM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 20, 2024, 01:13:23 AM
post Re: Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Keybored
March 20, 2024, 12:45:16 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 20, 2024, 12:30:30 AM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 19, 2024, 11:12:24 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 19, 2024, 09:47:49 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 19, 2024, 09:44:19 PM
post Phase Lead Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
March 19, 2024, 06:52:09 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 19, 2024, 05:02:44 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
Mads Barnkob
March 19, 2024, 05:01:41 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 19, 2024, 04:31:02 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
March 19, 2024, 03:59:54 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
March 19, 2024, 06:41:39 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
davekni
March 19, 2024, 04:05:49 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
OmGigaTron
March 18, 2024, 09:08:35 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
2020-Man
March 18, 2024, 09:07:35 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
Twospoons
March 18, 2024, 08:57:06 PM
post Re: Can I Trust This Super Cheap Site?
[General Chat]
MRMILSTAR
March 18, 2024, 03:51:33 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 18, 2024, 02:59:46 PM
post Re: 160mm DRSSTC II project | Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Late
March 18, 2024, 02:33:25 PM
post Can I Trust This Super Cheap Site?
[General Chat]
2020-Man
March 18, 2024, 11:02:12 AM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Twospoons
March 18, 2024, 02:36:11 AM
post Re: Best forum for vacuum tube amplifiers?
[General Chat]
Mads Barnkob
March 17, 2024, 07:42:55 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 04:15:14 PM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 05:05:04 AM
post Re: Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
davekni
March 17, 2024, 04:50:51 AM
post Re: 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Twospoons
March 17, 2024, 04:45:17 AM
post 2x Panasonic Inverter Microwaves - what to salvage, dangers?
[General Chat]
Michelle_
March 17, 2024, 04:17:51 AM
post Where's all this voltage coming from?
[Spark Gap Tesla Coils (SGTC)]
Terry
March 17, 2024, 01:29:32 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
March 17, 2024, 12:33:06 AM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Keybored
March 16, 2024, 08:46:20 PM
post Re: Bleeder resistor for MMC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
March 16, 2024, 08:39:24 PM
post Re: DRSSTC Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
March 16, 2024, 08:21:44 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal