Author Topic: 60hz synchronous motor on 50hz?  (Read 1603 times)

Offline paulj

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
    • View Profile
60hz synchronous motor on 50hz?
« on: November 24, 2021, 08:28:50 AM »
Hello, I would like to start a tesla coil project with a real synchronous motor, (no modified asynchronous motor)

However, they are rare and very expensive in single phase.
I know that in the USA the teletype motors are used but only work in 60 hz 120v, but with us, it is 50 hz 230v.
``
I can change the voltage from 230 to 120v easily, but will running the motor at 60hz guarantee me a synchronized rotation speed?

for example is it on a synchronous motor of 3600 rpm in 60 hz, its rotation speed will change to a synchronized speed in 50 hz (2500 rpm or 3000 rpm?)

Thanks in advance for your answers, Paul

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 412
  • Karma: +13/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #1 on: November 24, 2021, 11:03:52 PM »
Yes.   
It's like the synchronous motors that rotate MWO turntables
at 6.0 rpm (60 Hz) or 5.0 rpm (50 Hz) with same gears.
So you know what cook-times will return mug handles to their original orientation.

I have a Teletype motor & would test it for you on 50 Hz power, if I could find a source for that.  There might be one at work.  Decades ago, to test a 20,000 watt product for use in Europe, they rented a motor-generator set with belt drive to change 60 Hz to 50 Hz.

My motors collection includes a synchronous unit from Ampex, that turns at 1800 or 3600 RPM depending on which stator coil is energized.
« Last Edit: November 24, 2021, 11:11:47 PM by klugesmith »

Offline davekni

  • High Voltage Expert
  • ******
  • Posts: 1442
  • Karma: +70/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #2 on: November 25, 2021, 02:25:10 AM »
Quote
I can change the voltage from 230 to 120v easily, but will running the motor at 60hz guarantee me a synchronized rotation speed?
Probably.  A 60Hz synchronous motor will generally work at 50Hz at 5/6ths speed.  Voltage should be reduced too, theoretically to 5/6ths, or 100V for a 120V motor, to maintain the same current draw and internal heating.  (Due to losses, you may want a bit more than 100V, as long as the motor doesn't overheat.)  If it is a capacitor-run motor, the capacitance should ideally be somewhere between 6/5ths and 36/25ths of the normal 60Hz value, depending on winding resistance and inductance.  If the motor uses a shaded pole or other resistive technique (no capacitor), starting torque may be reduced some at 50Hz.
David Knierim

Offline paulj

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #3 on: November 25, 2021, 10:52:44 AM »
I am going to order a teletype motor.
To test the sycnhronization I will use the technique of Terry Blake with a colored straw on the rotor and a fluorescent bulb to check the synchronization.
i use a 100-105-115-120v transformer, or variac, if that doesn't work i know its motors are finicky to start.

Thank you for your answers, I will keep you posted next month when I receive it.
« Last Edit: November 25, 2021, 10:56:25 AM by paulj »

Offline 304er

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
  • "Always the hard way..."
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #4 on: November 26, 2021, 05:07:10 AM »
Hi all,

Here is a couple of pictures of a teletype motor my father and I have.
It was a little hard to get a good picture of nameplate info stamped direct into round motor body, I think it is readable zoomed in...hope this helps some...

https://photos.app.goo.gl/jVKkMUn9dUQM5yAK9

Chris Reeland
Ladd Illinois USA
Chris Reeland
Ladd Illinois USA
Former Printer

Offline plasma

  • High Voltage Experimenter
  • **
  • Posts: 81
  • Karma: +0/-1
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #5 on: November 26, 2021, 05:40:37 PM »
Hi all

You can get a VFD, variable frequency drive from 1-200Hz to control the speed of induction motors, they take care of the current etc.

Make sure you check if the motor is 2-4-8 pole 8 being the slowest rpm.

Offline davekni

  • High Voltage Expert
  • ******
  • Posts: 1442
  • Karma: +70/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #6 on: November 26, 2021, 06:58:16 PM »
Quote
Here is a couple of pictures of a teletype motor my father and I have.
It was a little hard to get a good picture of nameplate info stamped direct into round motor body, I think it is readable zoomed in...hope this helps some...
The nameplate lists 50Hz and 60Hz operation, along with the corresponding 3000RPM and 3600RPM.  Should work fine.
David Knierim

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 372
  • Karma: +12/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #7 on: November 26, 2021, 08:24:39 PM »
A VFD is not useful for powering a synchronous motor for a SGTC synchronous rotary spark gap. Even if you manage to find a speed (frequency) setting that yields the exact desired RPM, the spark gap rotor electrodes rotated by the motor will very likely not be in proper phase alignment with the power line waveform voltage peaks when they fire. Even if you got lucky and managed to get it in-phase with the power line voltage peaks, the motor speed will slowly drift depending on the precision of the timing circuitry in the VFD thus eventually taking it out of proper phase alignment with the power line.

You actually need a synchronous motor or a normal induction motor modified to be a synchronous motor in order to remain phase-locked with the power line current. Either motor must be connected directly to the power line.
« Last Edit: November 26, 2021, 11:35:28 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 412
  • Karma: +13/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #8 on: November 26, 2021, 11:17:55 PM »
Here's a little synchronous motor whose nameplate has speeds & powers for 60 Hz and 50 Hz.
It has a permanent magnet armature, as does the Teletype motor (but not all synchronous motors).
« Last Edit: November 26, 2021, 11:19:29 PM by klugesmith »

Offline paulj

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #9 on: November 27, 2021, 10:06:41 PM »
hello,
I ordered a teletype engine, I'll see what happens.
I'll take some pictures for you.  :)
If it works, I will use it for a really big sgtc that I have planned.

I really like the spark gap coils for their very simple operation;)

Offline plasma

  • High Voltage Experimenter
  • **
  • Posts: 81
  • Karma: +0/-1
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #10 on: November 28, 2021, 05:32:16 AM »
MRMILSTAR

I assumed there were two sparkgaps and a DC high voltage supply, with the two electrodes alternate creating AC.

A one sparkgap system would be easier but need synchroniznation.

The former could work at more frequency range?

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 372
  • Karma: +12/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #11 on: November 28, 2021, 04:48:04 PM »
A DC SGTC with a RSG requires no synchronization and can run at any RPM consistent with the other electrical components.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline johnnyzoo

  • High Voltage Enthusiast
  • *
  • Posts: 29
  • Karma: +1/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #12 on: November 28, 2021, 10:05:40 PM »
A VFD is not useful for powering a synchronous motor for a SGTC synchronous rotary spark gap. Even if you manage to find a speed (frequency) setting that yields the exact desired RPM, the spark gap rotor electrodes rotated by the motor will very likely not be in proper phase alignment with the power line waveform voltage peaks when they fire. Even if you got lucky and managed to get it in-phase with the power line voltage peaks, the motor speed will slowly drift depending on the precision of the timing circuitry in the VFD thus eventually taking it out of proper phase alignment with the power line.

You actually need a synchronous motor or a normal induction motor modified to be a synchronous motor in order to remain phase-locked with the power line current. Either motor must be connected directly to the power line.

I agree, but as usual, I got some additional ideas... :o

Are there advanced motor/servo drives that can be controlled by giving an angle reference? If mains voltage (reduced via transformer and possibly processed somehow) were fed as a reference signal, such a drive would then synchronise the motor speed to the mains frequency. Some jitter might remain but maybe not too much.

Motor type would not matter but it must of course be compatible with the drive system. 

This would of course be rather complex, such drives are probably not common or cheap anyway and it would probably need an encoder for precise control.

Phasing the spark might not be a big problem as it must be checked mechanically anyway, even with true synchronous motors, right? Adjusting the angle reference electrically might actually be easier.
« Last Edit: November 28, 2021, 10:10:04 PM by johnnyzoo »

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 372
  • Karma: +12/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #13 on: November 28, 2021, 10:21:11 PM »
Feedback phase control of a RSG is certainly possible. The potential problem is that Tesla coils, and SGTCs in particular, are not kind to nearby electronics. Sensitive electronics can fail or behave in strange ways.
« Last Edit: November 29, 2021, 06:12:30 AM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline davekni

  • High Voltage Expert
  • ******
  • Posts: 1442
  • Karma: +70/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #14 on: November 29, 2021, 12:07:30 AM »
Yes, phase-locked control is possible.  I built two motor drives for my SRSGTC.  First used a standard synchronous motor.  The second used a DC motor with a home-built speed controller locked to line frequency.  That allows simple remote phase adjustment with a potentiometer.  For both motors/drives, I found it necessary to use a separate outlet for the motor, not shared with the outlets used for SRSGTC power.  (Coil power came from two 120V outlets to get more power, one MOT per outlet, series connected secondaries.)  If the motor ran on one of the power outlets, voltage drop induced by the main coil power changed motor phase, which changed power drawn, etc.  Caused unstable feedback.
David Knierim

Offline paulj

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #15 on: December 21, 2021, 06:55:23 PM »
Hello, I just got the motor, it's a 5sc19lg3b teletype synchronous motor

voltage: 115v
current: 2.0 amp
rpm: 3600
hp: 1/20
cy: 60
it's single-phase, however it has 3 wires (surely to make it run at high speed) and I don't know how to wire it, I measured the inductances of the three wires:

red / green: 38 mH
yellow / green: 17.66 mH
red / yellow: 21.5 mH

Could you confirm for me the direction of connection without my risking to burn it?

thank you ;)
« Last Edit: December 21, 2021, 07:04:31 PM by paulj »

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 412
  • Karma: +13/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #16 on: December 21, 2021, 08:22:01 PM »
Maybe it needs a capacitor.   Does nameplate mention a capacitance value?



I would suggest C between your red and green wires.   AC power, one side to yellow and the other to green or red (for opposite directions of rotation).
« Last Edit: December 21, 2021, 08:27:36 PM by klugesmith »

Offline paulj

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #17 on: December 21, 2021, 09:06:50 PM »
Maybe it needs a capacitor.   Does nameplate mention a capacitance value?

I would suggest C between your red and green wires.   AC power, one side to yellow and the other to green or red (for opposite directions of rotation).

no unfortunately, I have no information, I can try to contact the GE archives to have a datasheet, but I don't think they will answer me (especially with my English translated from google).

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 412
  • Karma: +13/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #18 on: December 21, 2021, 09:18:45 PM »
I can dig out my Teletype motor and report about capacitor and winding inductance.  Maybe not in next 24 hours.

Offline paulj

  • High Voltage Experimenter
  • **
  • Posts: 50
  • Karma: +2/-0
    • View Profile
Re: 60hz synchronous motor on 50hz?
« Reply #19 on: December 21, 2021, 09:38:32 PM »
I can dig out my Teletype motor and report about capacitor and winding inductance.  Maybe not in next 24 hours.


I think I found it!
https://www.navy-radio.com/manuals/tty/1167B-ch7.pdf
it is a 43 to 48 mfd capacitor
thank you GE archives!
but no information on the connection of the wires, nor the voltage.

Can you measure the coil inductances from your motor, could this help me with the wiring?

High Voltage Forum

Re: 60hz synchronous motor on 50hz?
« Reply #19 on: December 21, 2021, 09:38:32 PM »

 


* Recent Topics and Posts

post Re: Self Starting Coil (Not)
[Solid State Tesla Coils (SSTC)]
alan sailer
Today at 03:55:07 PM
post Re: Mixing PID loops
[General Chat]
TMaxElectronics
Today at 12:00:50 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
304er
Today at 09:05:40 AM
post Mixing PID loops
[General Chat]
Patrick
Today at 07:28:01 AM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
jpvvv123
Today at 04:13:06 AM
post Re: Self Starting Coil (Not)
[Solid State Tesla Coils (SSTC)]
davekni
Today at 03:34:15 AM
post Self Starting Coil (Not)
[Solid State Tesla Coils (SSTC)]
alan sailer
January 23, 2022, 10:45:46 PM
post Re: GDT Slow Rise/Fall times even with resistor shorted
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
January 23, 2022, 09:06:49 PM
post GDT Slow Rise/Fall times even with resistor shorted
[Dual Resonant Solid State Tesla coils (DRSSTC)]
SalinsLV
January 23, 2022, 07:18:56 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 23, 2022, 06:18:13 PM
post Re: 120VAC Mains Ramped Builds
[Solid State Tesla Coils (SSTC)]
Magneticitist
January 22, 2022, 11:20:55 AM
post Re: 120VAC Mains Ramped Builds
[Solid State Tesla Coils (SSTC)]
ZakW
January 22, 2022, 07:07:09 AM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
johnf
January 22, 2022, 05:27:37 AM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
davekni
January 22, 2022, 04:27:38 AM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
jpvvv123
January 22, 2022, 12:53:04 AM
post Re: 120VAC Mains Ramped Builds
[Solid State Tesla Coils (SSTC)]
Magneticitist
January 21, 2022, 07:36:07 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
Uspring
January 21, 2022, 07:27:23 PM
post Re: Etching PCBs with a SLA 3d printer
[Printed Circuit Board]
TMaxElectronics
January 21, 2022, 02:05:52 PM
post Re: 120VAC Mains Ramped Builds
[Solid State Tesla Coils (SSTC)]
ZakW
January 21, 2022, 09:08:18 AM
post Re: Muon Decay
[Detection, Counting and Measurements]
Da_Stier
January 21, 2022, 08:42:54 AM
post 120VAC Mains Ramped Builds
[Solid State Tesla Coils (SSTC)]
Magneticitist
January 21, 2022, 03:00:04 AM
post Re: Muon Decay
[Detection, Counting and Measurements]
alan sailer
January 21, 2022, 02:16:57 AM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
TiagoBS
January 20, 2022, 06:56:35 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
Da_Stier
January 20, 2022, 05:19:26 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
alan sailer
January 20, 2022, 03:53:54 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
Uspring
January 20, 2022, 01:20:19 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
Da_Stier
January 20, 2022, 10:11:21 AM
post Re: Muon Decay
[Detection, Counting and Measurements]
alan sailer
January 19, 2022, 08:22:49 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
Mads Barnkob
January 19, 2022, 06:49:36 PM
post Re: Etching PCBs with a SLA 3d printer
[Printed Circuit Board]
hardboiled99
January 19, 2022, 07:37:27 AM
post Primary Coil Winding Technique
[Solid State Tesla Coils (SSTC)]
alan sailer
January 18, 2022, 10:34:48 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
alan sailer
January 18, 2022, 08:46:53 PM
post Re: Muon Decay
[Detection, Counting and Measurements]
Mads Barnkob
January 18, 2022, 08:08:53 PM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
ZakW
January 18, 2022, 07:15:22 PM
post Muon Decay
[Detection, Counting and Measurements]
alan sailer
January 18, 2022, 06:49:48 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 18, 2022, 08:47:53 AM
post Re: QO-100 / EShail 2 Uplink amplifier development adventures
[Radio Frequency]
Da_Stier
January 17, 2022, 09:13:32 PM
post Re: QO-100 / EShail 2 Uplink amplifier development adventures
[Radio Frequency]
Da_Stier
January 17, 2022, 09:05:56 PM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
January 17, 2022, 07:45:48 PM
post Re: General Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
January 17, 2022, 07:41:34 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
Mads Barnkob
January 17, 2022, 07:38:25 PM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
January 17, 2022, 07:31:03 PM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
January 17, 2022, 07:28:02 PM
post Re: Induction heater Driver for Flyback?
[Voltage Multipliers]
MRMILSTAR
January 16, 2022, 09:00:02 PM
post Induction heater Driver for Flyback?
[Voltage Multipliers]
abstruse1
January 16, 2022, 07:35:26 PM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
Bambinz
January 16, 2022, 12:21:40 PM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
davekni
January 15, 2022, 07:10:03 PM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
Bambinz
January 15, 2022, 06:31:33 PM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
Magneticitist
January 14, 2022, 08:47:43 PM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
davekni
January 14, 2022, 08:39:07 PM
post Re: Unusual Youtube channel activity
[General Chat]
davekni
January 14, 2022, 08:14:17 PM
post Re: Unusual Youtube channel activity
[General Chat]
Mads Barnkob
January 14, 2022, 08:12:13 PM
post Unusual Youtube channel activity
[General Chat]
MRMILSTAR
January 14, 2022, 05:51:52 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 14, 2022, 08:51:57 AM
post Re: SSTC with push-pull configuration
[Solid State Tesla Coils (SSTC)]
Bambinz
January 13, 2022, 08:20:02 PM
post Re: Help with SSTC feedback circuits with 4046 IC and Schmitt Triggers
[Solid State Tesla Coils (SSTC)]
davekni
January 13, 2022, 05:27:40 AM
post Re: General Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
January 13, 2022, 03:10:32 AM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 12, 2022, 06:18:15 PM
post Re: Single mosfet bifiliar gdt
[Solid State Tesla Coils (SSTC)]
alan sailer
January 12, 2022, 05:45:26 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
January 12, 2022, 03:29:04 PM
post Re: Help with SSTC feedback circuits with 4046 IC and Schmitt Triggers
[Solid State Tesla Coils (SSTC)]
AFreshLad
January 12, 2022, 01:30:38 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 12, 2022, 09:09:13 AM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
January 11, 2022, 08:05:27 PM
post Re: Nokia Siemens 3G Flexi 2100MHz 50W Amplifier Teardown
[Radio Frequency]
Mads Barnkob
January 11, 2022, 07:42:12 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
Duane B
January 11, 2022, 07:33:15 PM
post Re: 8x MOT transformer, weird power draw
[Transformer (Iron Core)]
AstRii
January 11, 2022, 06:19:49 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 11, 2022, 05:19:46 PM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
January 11, 2022, 04:31:28 PM
post Re: 8x MOT transformer, weird power draw
[Transformer (Iron Core)]
AstRii
January 11, 2022, 03:21:37 PM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
davekni
January 11, 2022, 06:50:49 AM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
Duane B
January 11, 2022, 06:34:20 AM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
davekni
January 11, 2022, 06:24:13 AM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
davekni
January 11, 2022, 06:15:08 AM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
January 11, 2022, 05:25:31 AM
post Re: Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
Duane B
January 11, 2022, 12:07:22 AM
post Strange reading for grid feedback coil voltage
[Vacuum Tube Tesla Coils (VTTC)]
MRMILSTAR
January 10, 2022, 10:56:48 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
Duane B
January 10, 2022, 09:38:53 PM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
ZakW
January 10, 2022, 07:50:13 PM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
ZakW
January 10, 2022, 07:19:17 PM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
TiagoBS
January 10, 2022, 03:13:08 PM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
davekni
January 10, 2022, 04:21:46 AM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 10, 2022, 03:59:09 AM
post Re: 8x MOT transformer, weird power draw
[Transformer (Iron Core)]
davekni
January 10, 2022, 03:54:59 AM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
ZakW
January 09, 2022, 11:45:09 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
jpvvv123
January 09, 2022, 11:04:25 PM
post 8x MOT transformer, weird power draw
[Transformer (Iron Core)]
AstRii
January 09, 2022, 04:22:11 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
Duane B
January 09, 2022, 05:52:11 AM
post Re: GDT Testing
[Solid State Tesla Coils (SSTC)]
davekni
January 09, 2022, 05:10:50 AM
post Re: Performance issues regarding phase angle in SSTCs
[Solid State Tesla Coils (SSTC)]
davekni
January 09, 2022, 01:20:40 AM
post GDT Testing
[Solid State Tesla Coils (SSTC)]
ZakW
January 09, 2022, 12:38:28 AM
post Re: General Questions
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
January 08, 2022, 06:36:28 PM
post Performance issues regarding phase angle in SSTCs
[Solid State Tesla Coils (SSTC)]
Max Seiringer
January 08, 2022, 03:21:31 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 08, 2022, 09:05:41 AM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
jpvvv123
January 07, 2022, 10:20:10 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
304er
January 07, 2022, 05:56:28 PM
post Re: First SSTC based on profdc9 PCB Pack
[Solid State Tesla Coils (SSTC)]
davekni
January 07, 2022, 05:15:38 AM
post Re: DRSSTC tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
January 07, 2022, 05:01:21 AM
post Re: How to prevent secondary to secondary to primary arcs?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
January 07, 2022, 04:59:59 AM
post Tophat QCW 1
[Dual Resonant Solid State Tesla coils (DRSSTC)]
dbach
January 07, 2022, 02:27:35 AM
post How to prevent secondary to secondary to primary arcs?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
dbach
January 07, 2022, 02:19:40 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