Author Topic: 8 kW Induction Cooktop Teardown and Reverse engineering  (Read 2460 times)

Offline Mads Barnkob

  • Administrator
  • Executive Board Member
  • *****
  • Posts: 2278
  • Karma: +72/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
8 kW Induction Cooktop Teardown and Reverse engineering
« on: January 16, 2023, 04:44:12 PM »
Teardown of a 8 kW induction cooktop, supplied from 2 single phase mains and neutral. Modular construction with two inverter modules and changeable coils.

/>
The IGBTs are Toshiba GT60J323 with a mere 120A pulsed rating, but despite that, lets explore reverse engineering what looks like a fairly common half-bridge layout and see with how little external circuit we can turn this into a Tesla coil inverter :)



Enjoy the teardown video while I map out the circuit and drivers!
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 Avenger

  • High Voltage Enthusiast
  • *
  • Posts: 19
  • Karma: +3/-0
    • View Profile
    • Mr Flybacker
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #1 on: January 17, 2023, 04:24:24 AM »
If this is an ordinary half-bridge, and the operating frequency is enough, then I think it can be used in a simple SSTS. The power will obviously be less than in the induction cooker :)
All ingenious is simple

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 690
  • Karma: +22/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #2 on: January 17, 2023, 04:41:26 AM »
Thanks for sharing.   We look forward to the circuit details.   
Do you think the front end (AC main to DC bus) includes a power factor correction function?
I've seen that in an industrial high voltage PS from Spellman, but never in a consumer product.   
Maybe it's time, as governments begin to ban gas stoves and say "try induction, you'll like it." :)

Offline davekni

  • Executive Board Member
  • *******
  • Posts: 2767
  • Karma: +132/-1
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #3 on: January 17, 2023, 05:04:21 AM »
Quote
Do you think the front end (AC main to DC bus) includes a power factor correction function?
I believe there are regulations in Europe (and I think US too) requiring appliances of that power level to meet power factor lower limits.  I also believe that the common way to achieve high power factor for such heating appliances is to have heating power track line voltage squared.  In other words, no bulk caps.  Half-bridge Vbus tracks rectified line voltage, so current remains proportional to voltage.
« Last Edit: January 17, 2023, 05:06:47 AM by davekni »
David Knierim

Offline Twospoons

  • High Voltage Engineer
  • ****
  • Posts: 223
  • Karma: +6/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #4 on: January 17, 2023, 05:41:59 AM »
Its also much cheaper to let the power fluctuate at 2x mains frequency, than to build a high power PFC. For heating it doesn't matter if the power level oscillates.
Can you imagine the cost of the bulk caps alone for an 8kW PFC?

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 690
  • Karma: +22/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #5 on: January 17, 2023, 07:51:05 AM »
Bet you're right about just letting the DC bus look like rectified sinusoid. Mads's video points out small-ish (4 uF) 400V capacitors, guessing they are connected to the DC rails close to each half bridge.

It would limit the musical opportunities in SSTC service, because any interrupter waveform would be mixed with the rectified line-frequency sine.

There's a similar power factor issue with microwave ovens, even the half-century-old design with one capacitor and one diode for voltage doubling.  Vkk at the magnetron, and consequent microwave power, fluctuate at line frequency (not 2x).  Who knows the power factor at wall plug, or wants to look it up, or measure or simulate it?
« Last Edit: January 17, 2023, 08:09:58 AM by klugesmith »

Offline rikkitikkitavi

  • High Voltage Technician
  • ***
  • Posts: 127
  • Karma: +2/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #6 on: January 17, 2023, 12:43:26 PM »
Quote
Do you think the front end (AC main to DC bus) includes a power factor correction function?
I believe there are regulations in Europe (and I think US too) requiring appliances of that power level to meet power factor lower limits.  I also believe that the common way to achieve high power factor for such heating appliances is to have heating power track line voltage squared.  In other words, no bulk caps.  Half-bridge Vbus tracks rectified line voltage, so current remains proportional to voltage.

That is correct. All high powered appliances using induction heating is designed this way. The caps used are only for supplying the switch bridge with energy. It also has the advantage that when the transistors blow to short, which does happen occaisionally there is not a lot of energy stored that is dumped into these during shorting, and also pose a higher risk during maintainence. Still there is energy to wreck havoc on PCB , switchers and commonly the rectifier bridge (I know, I have repaired a few) but limited to these. Instead if there where a 100J charged 1000uF cap bank the damage would be considerabel to PCB and rest of circuit.

Small electronic transformers for the now (EU atleast) fast disappearing low voltage halogen bulbs use a similar topology. A half bridge driving the power transformer but no caps and hence it is a square wave modulated with a sinus.

Most common problem with these during installation is that in the nordic countries atleast the stoves where only 2-3 phase with PE, no neutral.
So when connecting a new induction top it is feed 400V instead of 230V. Boom it goes.
« Last Edit: January 17, 2023, 12:46:16 PM by rikkitikkitavi »
A man can not have too many variacs

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 690
  • Karma: +22/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #7 on: January 17, 2023, 05:38:24 PM »
Quote
Small electronic transformers for the now (EU atleast) fast disappearing low voltage halogen bulbs use a similar topology. A half bridge driving the power transformer but no caps and hence it is a square wave modulated with a sinus.
Low voltage halogen bulbs with HF transformers are new to me.  Are these built in to the lamp base, as with ballasts in screw base CFL lamps? How many watts? How big?

Quote
Most common problem with these during installation is that in the nordic countries atleast the stoves where only 2-3 phase with PE, no neutral.
So when connecting a new induction top it is feed 400V instead of 230V. Boom it goes.
Boo hoo, no free IGBTs there.  Maybe free capacitors and Litz wire. :)

Now what happens if we feed rectified, unfiltered power to a simple Mazilli self-oscillating ZVS driver?  I will guess that  line voltage zero crossings are a challenge, even with separate DC power to gates.  Can "oscillation" stop, each time resonant tank voltage gets too small to make gates switch, and re-start each time Vdd ramps back up in the next half-cycle of AC power?

Offline rikkitikkitavi

  • High Voltage Technician
  • ***
  • Posts: 127
  • Karma: +2/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #8 on: January 17, 2023, 09:37:16 PM »
As for the halogen transformers , good ol´Danyks has some schematics with the IR2153 half bridge driver.

https://danyk.cz/elhatr_en.html

 There is self oscillating variants too , that does not seems to have difficulties with zero crossing etc. I have rarely seen one blow. The ones I have dismantled all where some kind of variant of this, never seen one with IR2153 IRL, or other IC, but I guess the chinese prefered spending a few cents less and use  a coupla transistors. But always seems that there is more transistors IRL on the boards than in the online schematics one finds by Google . Never really bothered to reverse engineer a schematic either from these.

Good ol´Rod Elliot has some (damn, that is a living , working archive, I remember building a P3A amplifier in my 20ies)

https://sound-au.com/lamps/elect-trans.html

But there is a lot about these mre simple ones. I did put a schottky bridge on one and a low-ESR caps and voila, cheap DC voltage. But yes, it did blow the cap eventually. That is when I learned about RMS current rating and ESR gives power loss...
« Last Edit: January 17, 2023, 09:39:40 PM by rikkitikkitavi »
A man can not have too many variacs

Offline davekni

  • Executive Board Member
  • *******
  • Posts: 2767
  • Karma: +132/-1
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #9 on: January 18, 2023, 04:27:49 AM »
Quote
Now what happens if we feed rectified, unfiltered power to a simple Mazilli self-oscillating ZVS driver?  I will guess that  line voltage zero crossings are a challenge, even with separate DC power to gates.  Can "oscillation" stop, each time resonant tank voltage gets too small to make gates switch, and re-start each time Vdd ramps back up in the next half-cycle of AC power?
My ZVS-driven Jacob's ladder project originally had no bulk cap:
https://highvoltageforum.net/index.php?topic=831.msg5491#msg5491
Between remaining tank circuit energy and remaining energy in small snubber caps, oscillation did continue sufficiently to pick up again on next half-cycle.
However, I still decided to add a small bulk cap.  Reason was to keep arc hot enough to avoid extinguishing between half-cycles.  Size was a compromise between keeping arc hot and keeping power factor from getting too low.
David Knierim

Offline Mads Barnkob

  • Administrator
  • Executive Board Member
  • *****
  • Posts: 2278
  • Karma: +72/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #10 on: January 18, 2023, 08:23:57 PM »
It turned out as expected, just a regular half-bridge with all the bells and whistles. Regular bridge rectifier and passive filtering. And as its guessed by others, induction cooktops uses quasi-resonant mode in phase with mains current.

Theoretically I could just smack 230VAC on this sucker and inject a driving signal on the HI/LO inputs from TTL logic, its properly more a question about driving power when going from 20-25kHz into ten times that. So the driver section should really just be replaced by a regular GDT setup and no worries to be had. But for the sake of MINIMAL addition of more components, I still think it will fail at those frequencies.

On the backside of the PCB, there was however a high-side driver hiding itself!



It took a while to trace all the tracks, a lot goes under components as well. SMD diode/Capacitor values are best guess, as its impossible to measure them in-circuit.

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 klugesmith

  • High Voltage Senior
  • *****
  • Posts: 690
  • Karma: +22/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #11 on: January 19, 2023, 03:10:56 AM »
Thank you for a well-drawn and useful schematic.

We see that driver IC L6388 is obsolete and no longer manufactured.  Digikey suggested one alternative which appears to be pin compatible: DGD2304.  Available in single unit quantities.   US $0.57 each in quantity of 1000.

Offline Mads Barnkob

  • Administrator
  • Executive Board Member
  • *****
  • Posts: 2278
  • Karma: +72/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #12 on: January 23, 2023, 01:23:41 PM »
I will try to connect a SSTC driver with antenna feedback, to drive the half-bridge. But since there is two individual half-bridges and I want to modify as little as possble, could I just connect the two outputs in parallel to the same primary coil?

I don't think there should be any large issues with that, since its sharing the same rectifier and mains input, driving would be from a 4 output GDT, so that is also in sync.

Did I miss anything that would make it smoke? :)
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 rikkitikkitavi

  • High Voltage Technician
  • ***
  • Posts: 127
  • Karma: +2/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #13 on: January 23, 2023, 10:23:54 PM »
What happens if the bridges are out of phase? I mean not 50Hz out of phase, but de synchronized when it comes to the switching?




A man can not have too many variacs

Offline davekni

  • Executive Board Member
  • *******
  • Posts: 2767
  • Karma: +132/-1
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #14 on: January 24, 2023, 04:41:01 AM »
Quote
Did I miss anything that would make it smoke? :)
Probably work fine.  A few possible issues that you probably already considered:

1) I'm presuming this SSTC design already has an HC14 receiving antenna output, and that HC14 output will be wired to both L6388 inputs.  If it were an SSTC version with antenna going directly to driver chip inputs (as I've seen a couple times here), the two L6388 chips might have slightly different logic input thresholds so switch at different times.

2) Presume L6388 has internal logic and delays to enforce no simultaneous IGBT conduction and dead time for switching.  With paralleled half-bridges, any noise or other extraneous logic transitions on one chip and not the other will cause cross-conduction.

3) Delay matching of the two L6388 chips and associated IGBTs need to be well within dead-time.  Probably no issue, especially since there's a good chance that chips came from same production lot.

4) The induction cooktop is likely designed to maintain ZCS conditions, at least most of the time.  GT60J323 spec lists it for resonant inverter applications.  Switching delays are listed for resistive load rather than inductive.  SOA is more limited than for most hard-switching IGBTs.  SSTCs typically are closer to hard-switching (hard turn-off only).  Your SSTC primary current may be low enough that none of this is an issue.  Might be less of an issue for a small DRSSTC with proper phase lead.

5) SSTC operation is likely at higher frequency than induction cooktop, up to a factor of 10 perhaps.  Even at low duty cycle, does the +15V supply have enough bypass capacitance to supply 10x (or whatever the frequency ratio is) current for the length of each enable pulse?

6) Similar question for half-bridge bus power, can line input handle the pulses of current draw, or are you adding bulk capacitance?

BTW, I've been wondering how easy it would be to use an induction cooktop circuit for my eddy current levitation box (if it ever needs repair).  Use is closer to induction cooking (similar frequency and continuous operation), except load Q is much higher for this use:
/>
Have fun with your experiment!
David Knierim

Offline romy

  • High Voltage Enthusiast
  • *
  • Posts: 39
  • Karma: +0/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #15 on: February 18, 2023, 07:52:11 AM »
1) most of this is above my head. i understand igbt-cookers have no smoothing stage and thus no power factor correction (v/i in phase). they work with a "modulated-sine-wave" where the sinus gets chopped up (sometimes even only after a half-bridge rectifier) as well as on/of operation. is this correct?

2) will it be diffcult getting rid of the change-in-permeability sensing circuit?
« Last Edit: February 18, 2023, 08:16:55 AM by romy »

Offline klugesmith

  • High Voltage Senior
  • *****
  • Posts: 690
  • Karma: +22/-0
    • View Profile
Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #16 on: February 18, 2023, 05:15:16 PM »
Regarding item 1, yes the power factor at wall plug connection is close to unity.
Input current is roughly sinusoidal, in phase with mains voltage.
In this case, achieved simply by accepting rectified sine as the "DC" bus voltage.

Don't confuse that with "power factor" in the induction coil and associated capacitor.
The high frequency circuit will have a substantial phase shift between voltage and current.
Volt-amp product much greater than the real power. 
Maybe the factor is less than 10, because the circuit isn't energized without a load. I didn't see if Mads's report includes any measurements of powered circuit.

High Voltage Forum

Re: 8 kW Induction Cooktop Teardown and Reverse engineering
« Reply #16 on: February 18, 2023, 05:15:16 PM »

 


* Recent Topics and Posts

post Has anyone tried to build a TMT (extra coil) Tesla coil?
[General Chat]
Michelle_
Today at 09:21:39 PM
post Re: Medium Drsstc question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
Today at 08:04:16 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
Today at 06:48:05 PM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
Today at 06:18:40 PM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
Today at 06:14:53 PM
post Re: 3D printed mini-slayer: world's weakest tesla coil
[Solid State Tesla Coils (SSTC)]
unrealcrafter2
Today at 05:44:44 PM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
Today at 03:12:12 PM
post Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
unrealcrafter2
Today at 02:28:01 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
Today at 01:56:26 PM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
Today at 06:50:47 AM
post Re: IKY150N65EH7, is it good for DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Anders Mikkelsen
Today at 04:57:47 AM
post Re: IKY150N65EH7, is it good for DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ethanwu0131
Today at 03:40:53 AM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
Today at 01:31:17 AM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
April 15, 2024, 11:19:52 PM
post 3D printed mini-slayer: world's weakest tesla coil
[Solid State Tesla Coils (SSTC)]
Michelle_
April 15, 2024, 11:10:19 PM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
alan sailer
April 15, 2024, 11:04:19 PM
post Re: Ignitron trigger drive ideas?
[Capacitor Banks]
Twospoons
April 15, 2024, 11:02:05 PM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
April 15, 2024, 10:57:59 PM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
April 15, 2024, 10:55:46 PM
post Re: Return of Electronics Flea Market in "Silicon Valley"
[Sell / Buy / Trade]
klugesmith
April 15, 2024, 10:37:32 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
April 15, 2024, 10:05:00 PM
post Re: How to get a GE Yokogawa AB40 Sync Scope to rotate without a powerplant.
[Laboratories, Equipment and Tools]
MRMILSTAR
April 15, 2024, 09:28:50 PM
post Ignitron trigger drive ideas?
[Capacitor Banks]
klugesmith
April 15, 2024, 09:06:42 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
April 15, 2024, 08:46:32 PM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Benbmw
April 15, 2024, 08:38:39 PM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
sky-guided
April 15, 2024, 08:23:40 PM
post How to get a GE Yokogawa AB40 Sync Scope to rotate without a powerplant.
[Laboratories, Equipment and Tools]
Bobakman
April 15, 2024, 06:43:23 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
April 15, 2024, 06:29:10 AM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
April 15, 2024, 05:21:53 AM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
April 15, 2024, 05:15:33 AM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 15, 2024, 04:07:54 AM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
davekni
April 15, 2024, 03:49:03 AM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
alan sailer
April 14, 2024, 09:46:30 PM
post Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
April 14, 2024, 07:31:00 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Saattvik24
April 14, 2024, 02:26:19 PM
post Re: mg75q2ys40 IGBT
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
April 14, 2024, 07:20:54 AM
post Re: IKY150N65EH7, is it good for DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
April 14, 2024, 07:18:20 AM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
April 13, 2024, 06:46:40 AM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
April 13, 2024, 04:18:42 AM
post Re: Upper and Lower Explosive Limits on Confined Flammable Vapors at -79 C.
[General Chat]
alan sailer
April 13, 2024, 03:24:20 AM
post Re: Game changing tesla coil secondary winding suggestions
[General Chat]
alan sailer
April 13, 2024, 03:20:46 AM
post Game changing tesla coil secondary winding suggestions
[General Chat]
Michelle_
April 13, 2024, 03:13:22 AM
post Re: Capacitor Blowout
[Sell / Buy / Trade]
lbattraw
April 12, 2024, 09:14:58 PM
post mg75q2ys40 IGBT
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedark
April 12, 2024, 08:40:18 PM
post Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 12, 2024, 07:20:30 PM
post Re: Mosfet Buffer Stage Questions
[Beginners]
davekni
April 12, 2024, 07:12:43 PM
post IKY150N65EH7, is it good for DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ethanwu0131
April 12, 2024, 04:47:33 PM
post Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
April 12, 2024, 11:43:36 AM
post Mosfet Buffer Stage Questions
[Beginners]
Egg
April 12, 2024, 12:49:02 AM
post Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 12, 2024, 12:41:16 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 12, 2024, 12:22:41 AM
post Re: Capacitor Blowout
[Sell / Buy / Trade]
Michelle_
April 11, 2024, 10:45:53 PM
post Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
April 11, 2024, 07:39:30 PM
post Re: UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
April 11, 2024, 07:24:52 PM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
sky-guided
April 11, 2024, 06:09:30 PM
post UD 2.7 OCD LED stays on, no output during inital test
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Admiral Aaron Ravensdale
April 11, 2024, 12:55:16 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
April 11, 2024, 03:40:00 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
sky-guided
April 11, 2024, 03:05:07 AM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
Michelle_
April 11, 2024, 02:57:33 AM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
alan sailer
April 11, 2024, 01:44:32 AM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
Michelle_
April 11, 2024, 01:31:40 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 11, 2024, 01:11:00 AM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
alan sailer
April 11, 2024, 12:58:52 AM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
Michelle_
April 11, 2024, 12:31:37 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
April 11, 2024, 12:30:21 AM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
alan sailer
April 10, 2024, 11:41:46 PM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
Mads Barnkob
April 10, 2024, 11:33:32 PM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
Michelle_
April 10, 2024, 10:41:33 PM
post Re: Tesla coil safety questions, risk analysis quantified
[Beginners]
MRMILSTAR
April 10, 2024, 10:31:31 PM
post Tesla coil safety questions, risk analysis quantified
[Beginners]
Michelle_
April 10, 2024, 09:56:35 PM
post Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
unrealcrafter2
April 10, 2024, 08:59:26 PM
post Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
markus
April 10, 2024, 06:35:30 PM
post Re: Drsstc voltage spike question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
April 10, 2024, 05:35:14 PM
post Medium Drsstc question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
unrealcrafter2
April 10, 2024, 03:07:02 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Michelle_
April 10, 2024, 03:42:12 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Michelle_
April 10, 2024, 03:41:04 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
sky-guided
April 10, 2024, 02:50:23 AM
post Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Unrealeous
April 10, 2024, 01:32:17 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 10, 2024, 01:26:29 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 10, 2024, 01:18:35 AM
post Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
April 09, 2024, 07:34:19 PM
post Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
April 09, 2024, 06:14:27 PM
post Re: CM400 Induction Heater
[Electronic Circuits]
markus
April 09, 2024, 06:08:53 PM
post Re: DRSSTC V1 using BSM1500
[Dual Resonant Solid State Tesla coils (DRSSTC)]
markus
April 09, 2024, 05:15:19 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Michelle_
April 09, 2024, 05:11:04 PM
post Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
April 09, 2024, 06:32:16 AM
post DRSSTC V1 using BSM150
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Unrealeous
April 09, 2024, 04:04:47 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
April 09, 2024, 03:27:11 AM
post Re: Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 09, 2024, 03:25:47 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 09, 2024, 03:01:40 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
sky-guided
April 09, 2024, 02:46:46 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 08, 2024, 09:32:57 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 08, 2024, 09:25:11 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
April 08, 2024, 08:45:15 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
April 08, 2024, 08:24:13 PM
post Big Coil Big Sparks
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
April 08, 2024, 04:02:48 PM
post Re: First DRSSTC SKM100
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 08, 2024, 03:45:30 AM
post Re: Oversize Snubber Capacitor
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedark
April 08, 2024, 03:35:32 AM
post Re: Oversize Snubber Capacitor
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
April 08, 2024, 03:12:45 AM
post Re: Oversize Snubber Capacitor
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
April 08, 2024, 03:03:26 AM

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