Date   

locked Re: Tesla Coil help needed

Jean-Paul
 

Hello all! Fine to see this. I have been doing Tesla coils since 1950s when I was a young and foolish kid.

See old issues of "Tesla Coil Builders Association" back to 1980, by Harry Goldman. Available as PDF and printed issued on epay.

The most knowledgeable Tesla maven today is Greg LEYH, see LOD.ORG, for the largest Tesla Coils ever.

Beware that neon sign transformers, plate transformers and charged HV caps can deliver a LETHAL shock.

Finally the machines when in operation emit copious amounts of noise, ozone, UV light and RF, which can have bad effects on your vision, hearing, lungs and the RF can disrupt or damage lots of electronics.

Just the ramblings of an old retied EE!

Enjoy and be safe,

Jean-Paul

PS: Is the last post from Steve H the X ray man?


Re: Scope Cameras

Jean-Paul
 

Bonjour Robin:

I had many TEK cameras circa 1980s..1990s and use 7000 series and 2465/7B.

I used my compact Panasonic Lumix LX-5 and LX-7 at fiorst in macro mode.

I took the most basic camera, with the blue plastic housing fitting the 7000 bezel, removed the back and other parts and placed gaffers black tape to mask the rear opening.

The distance for camera to CRT is 4 1/2 ", exactly right to allow a full screen shot in macro mode.

Finally with the advent of great mobile phone sensors and apps, I use iPhone 7, etc.

You must get the intensity and sweep rate adjusted and leave the camer on long shutter, I have ASA+800.

You can see the results if you search my previous posts eg re transient response.

Will post more if asked


Bon Chance,


Jon


Re: Scope Cameras

Glydeck
 

Here is what I came up with using a C-12 body I picked up cheap.

http://glydeck.blogspot.com/2011/03/motorola-mystery.html

George

On Mar 15, 2020, at 10:02 PM, Ed Breya via Groups.Io <edbreya=yahoo.com@groups.io> wrote:

I think I've mentioned before, that I've rigged up old C-5 scope camera carcasses with "modern" USB webcams and such, over the years. You just have to delete the original Polaroid camera back and lens, and figure a way to mount a new video camera head in its place. In more recent times, I prefer to use cell phone cameras instead.

I have some C-5s that I had planned to make into holders for cell phones, such that the optics land in the right place and focus point. With the right mechanical arrangement, it can be set up so the phone just rests on a shelf type thing that aligns it, and blocks out background light reflections from the screen. I haven't built any yet, but in the meantime, I have had decent results - enough to get the message across - with totally open freehand screen shots on a phone camera. The trick is to take plenty of shots from slightly different positions and lighting, then sort them out to find an acceptable one. Some may be defective due to timing issues between the scope trace and camera scanning rates, leaving blank spots and other distortions, but with enough shots, it isn't too hard to find a good one. This does not work with single-sweep traces though, unless maybe the camera can be set up for it somehow.

Ed




Re: Scope Cameras

Ed Breya
 

I think I've mentioned before, that I've rigged up old C-5 scope camera carcasses with "modern" USB webcams and such, over the years. You just have to delete the original Polaroid camera back and lens, and figure a way to mount a new video camera head in its place. In more recent times, I prefer to use cell phone cameras instead.

I have some C-5s that I had planned to make into holders for cell phones, such that the optics land in the right place and focus point. With the right mechanical arrangement, it can be set up so the phone just rests on a shelf type thing that aligns it, and blocks out background light reflections from the screen. I haven't built any yet, but in the meantime, I have had decent results - enough to get the message across - with totally open freehand screen shots on a phone camera. The trick is to take plenty of shots from slightly different positions and lighting, then sort them out to find an acceptable one. Some may be defective due to timing issues between the scope trace and camera scanning rates, leaving blank spots and other distortions, but with enough shots, it isn't too hard to find a good one. This does not work with single-sweep traces though, unless maybe the camera can be set up for it somehow.

Ed


Re: Scope Cameras

Chuck Harris
 

The nice thing about the C1001/C1002 cameras is you
can sub out the original camera for something good.

Which you may as well, as the frame grabber cards
were all long obsolete ISA cards, that were separated
from the cameras when their PC's got scrapped.

-Chuck Harris

Brian via Groups.Io wrote:

Hi , for a scope camera I use the C1001/C1002 cameras along with a CORTEX PCX200 frame grabber , it can also provide the 12v for the camera , the s/w for that may still be on their website .This camera is a video camera and the frame grabber allows getting a 'still' from the data stream . The frame grabber can be triggered much like a still camera and this is ok as long as the sweep rate is not fast .I pursued the Polaroid film path to be told by the new producers of the film that the production tools for the type 107 and the 665 film packs had not been saved after production ceased and they were not able to produce anything as a result , and may never as it would mean starting from scratch .

Brian


Tektronix Probe Tips DIY

Harvey White
 

One of the major problems with both Tektronix and HP probes is frequently the lack of tips. I do digital logic work, and after quite a while I managed to find a pair (both different) Tektronix tips which terminate in a wire with a connector suitable for a 0.025 inch (standard wirewrap) pin.

I got tired of not having more. I looked at Mouser (where I could find the equivalent ground leads for 5 mm diameter Tek & HP probes), I looked on Ebay. Nothing.

So I decided to see what I could do on my own. The average female/female jumper cable (available cheaply on Amazon or Ebay) fits well enough over the probe tip, but the piece of plastic is a bit harder (read impossible) to find.

Fortunately, I do have a 3D printer. So you start with a cylinder, hollow it out enough to fit over the ground barrel of a 5.0 mm probe, put a square hole in it to hold the one pin connector plastic for a female dupont connector, taper the tip, and make a through hole that’s large enough to allow the connector (minus plastic) to fit through. Do that, push the plastic on one end into the cap, put the plastic part back on, and then you have a probe tip that allows you to put the tip on a standard 5mm probe.

If the connector for the probe tip has a limited life, the jumper wires are quite cheap. You could also put one in for a female to male and connect directly to a breadboard.

If anyone wants the .stl files, please email me. I’ll also give you the .scad files if you wish. This is available for non-commercial use. I’m not posting the files here since anything posted becomes the property of groups.io.


Harvey


locked Re: Tesla Coil help needed

stevenhorii
 

This article on the Web has very good explanations of the parts, their use,
and safety considerations:

https://www.teslacoildesign.com/construction.html

Sorry if you've already seen this.

Best of luck with it.

Steve

On Sat, Mar 14, 2020 at 12:18 PM Tony Fleming <czecht@...> wrote:

I have a Tesla Coil kit but I don't have schematics that I can follow. All
my parts are mentioned in my video:
https://www.youtube.com/watch?v=Mt4y6j-foyY&list=PLv52A7rm-UViZEOlzZfZOB9Gl8cjS3ze5&index=2&t=0s
Or go to https://tonysfun.com/ and click on My Youtube Videos button.
You can see more information here, before going to my videos.
I'm not an expert, but I take lots of precautions and use Variac
Transformers and Isolation Transformers, among other steps to be safe.
I've built Jacob Ladders from Microwave Transformers and others, like in
the video, that is for Neon Lights.....
I've tried for several month to contact people on youtube and other
places, but many of them are older videos and I don't even know if the
people are still around or using the youtube at all....
The seller mentioned in the video doesn't answer their phone and no option
to leave a VM either.

If you know of anyone or any place that can help me with this project, I
would appreciate it very much.




Re: Scope Cameras

Brian
 

Hi , for a scope camera I use the C1001/C1002 cameras along with a CORTEX PCX200 frame grabber , it can also provide the 12v for the camera , the s/w for that may still be on their website .This camera is a video camera and the frame grabber allows getting a 'still' from the data stream . The frame grabber can be triggered much like a still camera and this is ok as long as the sweep rate is not fast .I pursued the Polaroid film path to be told by the new producers of the film that the production tools for the type 107 and the 665 film packs had not been saved after production ceased and they were not able to produce anything as a result , and may never as it would mean starting from scratch .

Brian

On Sunday, 15 March 2020, 23:21:34 GMT, John Williams <books4you@...> wrote:

I have a Tektronix video camera that mounts directly on the crt the same as the Tek still Polaroid cameras. There was a camera for sale on eBay a while back, all that is required is a “brick” to supply power to the camera. I believe Dennis Tillman made a still camera mount for this purpose.


Re: Scope Cameras

John Williams
 

I have a Tektronix video camera that mounts directly on the crt the same as the Tek still Polaroid cameras. There was a camera for sale on eBay a while back, all that is required is a “brick” to supply power to the camera. I believe Dennis Tillman made a still camera mount for this purpose.


Re: Scope Cameras

Harvey White
 

Haven't done much more than to consider the idea.

However, my experience is with canon EOS products.

Canon EOS stuff is apparently worth *nothing* when a new model comes out (I certainly couldn't get much for a 60D when I bought a 70D).

So any of the older canon models should be a starting point.

I'd be tempted to use a canon 10D (not sure when that's going to happen yet), but it takes a 2.5 mm phone plug to trigger it.  I'd think that some minor electronics slaved to the Tek scope camera electronics (haven't looked at that yet but I'd consider it strongly).   I'd want to consider a 50mm lens with an extender, make sure that it carries the signals with it, and then rework the scope camera back (and lens, sadly, and likely the electronics) to get a decent coverage.  I would not expect the existing lens in the scope camera to work simply because of the distance between the focal plane and the lens.  Since the original camera used a standard shutter and the canons use a focal plane shutter, expect a few differences there.

I'd think that a standard camera with a remote release, a few bits of electronics to control the shutter, and a lens extension tube might just get the job done.  IF you can do this with a phone, or a point and shoot, that's good.  Haven't played with that although I could.  An advantage of the DSLR is that if you can dig live video out of them, then you have a way of getting straight video off the scope screen into a monitor.

Just ideas, though.

Harvey

On 3/15/2020 3:31 PM, Robin_Birch wrote:
All,

I'm currently playing around with the Scope Hood models that were recently
posted on here (Thanks Michael). I'm starting to think about extending
these to make a modern scope camera, Polaroid film packs being made out of
pure unobtainium.


Has anyone got any experience of different digital cameras that would be
suitable: Electric release, able to extend exposure to max sweep on a 4
channel scope plus data painting, able to reduce exposure to fastest
position, plus any other frills that people can think of that are necessary.
The body would have to be suitable to mount on a hood, or possibly within
one. The lens would have to be able to focus down to a reasonable distance
and have a zoom that was adjustable to frame the screen.


Ideas anyone?


Robin


PS: I'd probably be putting this on a 7000 or a 468.




Re: Scope Cameras

greenboxmaven
 

Polaroid film is not going quietly into the darkness. There are continual requests from photographers to re-open production of the peel apart film packs, there is a single photo single use cartridge for Polaroid pack cameras available from Austria but it costs almost $10.00 per exposure. The dual seperate roll film for the older cameras has not been made for over 25 years, there are also continual requests for it to be produced again. Adapting phones or digital cameras is one possibility, but depending on the speed of the sweep a real photograph is still the best. Analog photography is rebounding in popularity, and Polaroid has been bought out by another company that is making film for some of the cameras. Fuji refused to continue making Polaroid peel-apart packs, the pressure on the new Polaroid company to produce them again is intense. Whether these requests will be considered worthy is unknown. Fuji does make several instant cameras, their Instax series. The cameras are in production and easy to buy, the film packs usually cost about $1.25-2.00 per exposure. The film is very fast, ASA 800, so getting the exposure correct would require filters and alterations to the shutter. New Polaroid cameras and their film packs are easily available and not too expensive, but the same sort of filtering and shutter modifications would be needed. It could be interesting to get home brew photography mavens involved. The good thing about all of this is that scope traces are very bright, so less sensitive photo media could be used.

Bruce Gentry, KA2IVY

On 3/15/20 3:31 PM, Robin_Birch wrote:
All,

I'm currently playing around with the Scope Hood models that were recently
posted on here (Thanks Michael). I'm starting to think about extending
these to make a modern scope camera, Polaroid film packs being made out of
pure unobtainium.

Ideas anyone?

Robin


PS: I'd probably be putting this on a 7000 or a 468.




Re: Scope Cameras

 

Hadn’t thought of a phone. Was thinking more along the go pro sort of thing. Hmmm, have to think about that

Cheers

Robin

On 15 Mar 2020, at 20:05, Mlynch001 <@mlynch001> wrote:

I have already built a prototype that uses an I-Phone to take pictures. I have not done enough with this to answer most of these questions. The I-Phone does a presentable job. It can be done with some additional work.

--
Michael Lynch
Dardanelle, AR



locked Re: Tesla Coil help needed

 

Hi Tony,

I have not forgotten about your Tesla coil you inquired in the other thread. I have no prior knowledge on how to build such a thing, although the principle is rather simple.
For circuit diagrams, I recommend that you google "Tesla coil circuit diagram" and you will see a bunch of different circuit diagrams, which give an idea of how they work.

It all starts with that metal box you had in your hand, with pins to "input" and to "load". This can be a line filter preceding the 60 hz step-up transformer that avoids getting the noise of the tesla coil into your home wiring.
Then comes the step-up transformer, in your case with a symmetrical secondary of 12 kV, (each half or between the two ends?) which can be safer than single-ended. This will give you 12 kV at 60 Hz that will feed the coil.

The 12 kV secondary connects to a capacitor bank in series with the "primary" of the tesla coil. This "primary" is what you wind with the copper tube around the concentric tesla coil that came already winded.
The capacitor bank is built with the 16 2 kV capacitors in series, with the many 20 Mohm resistors across these capacitors to help divide the total voltage across the bank equally among the many capacitors in series.

So the 12 kV will charge the capacitor bank through the tesla "secondary" to the high voltage.

What I see missing in your set is the SPARK GAP, This spark gap connects across the 12 kV secondary, also in parallel with the capacitor bank plus tesla "primary" in series. The purpose of the gap is short out the 12 kV before it reaches its peak, in this way discharging the capacitor bank through the tesla "primary' in a huge jolt of current, that induces in the long tesla (secondary) coil the huge voltage that makes the fireworks! (the 12 kV transformer is not affected by this sudden short because of its large stray inductance).

Maybe you find some guidance, especially in fabricating the spark gap, in the following video by someone who is building the tesla coil:

https://www.youtube.com/watch?v=yY8lGmibGVY

Have fun, and let me know how it works out and any further questions.

Regards,
Ernesto


Tektronix 491 band C (solid state version) varactor diodes

Miguel Work
 

Hi,

I´m searching for a replacement diode for a TEKTRONIX 491. Is marked as MA45601. I have replaced with a BB405, and PLL now works well, but If is possible I would like to put original ones or equivalent, ceramic body Ghz band diodes, in the MACOM catalog I don’t see it.
Any know where to find them?

Some photos in my album:

https://groups.io/g/TekScopes/album?id=86588


Thanks!




https://groups.io/g/TekScopes/photo/86588/3?p=Created,,,20,2,0,0

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de Mlynch001
Enviado el: domingo, 15 de marzo de 2020 21:05
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] Scope Cameras

I have already built a prototype that uses an I-Phone to take pictures. I have not done enough with this to answer most of these questions. The I-Phone does a presentable job. It can be done with some additional work.

--
Michael Lynch
Dardanelle, AR


Re: Scope Cameras

Mlynch001
 

I have already built a prototype that uses an I-Phone to take pictures. I have not done enough with this to answer most of these questions. The I-Phone does a presentable job. It can be done with some additional work.

--
Michael Lynch
Dardanelle, AR


Scope Cameras

 

All,

I'm currently playing around with the Scope Hood models that were recently
posted on here (Thanks Michael). I'm starting to think about extending
these to make a modern scope camera, Polaroid film packs being made out of
pure unobtainium.



Has anyone got any experience of different digital cameras that would be
suitable: Electric release, able to extend exposure to max sweep on a 4
channel scope plus data painting, able to reduce exposure to fastest
position, plus any other frills that people can think of that are necessary.
The body would have to be suitable to mount on a hood, or possibly within
one. The lens would have to be able to focus down to a reasonable distance
and have a zoom that was adjustable to frame the screen.



Ideas anyone?



Robin



PS: I'd probably be putting this on a 7000 or a 468.


locked Re: Tesla Coil help needed

Paul Amaranth
 

This is just too far off topic for this group. You should check into
some of the general or specialized electronics forums around the web.
Here, for example, is a forum dedicated solely to Tesla coils:

https://4hv.org

On Sun, Mar 15, 2020 at 01:41:16PM -0500, Tony Fleming wrote:
I understand, but people who are into electronics are also playing around
with "gizmo gadgets" like Tesla Coil.
That is the only reason I've mentioned it to you.
The problem with the Google search is it's limitations and in my case,
probably lack of expert use of Google search engine.
Many TC are there but my "kit" is specific to a design that I do not have.
On my side, I thought you might know someone or even yourself some
information to make this into a functional TC.
Have a great Sunday my friend.
Tony

On Sun, Mar 15, 2020 at 12:54 AM Roy Thistle <roy.thistle@...>
wrote:

On Sat, Mar 14, 2020 at 09:18 AM, Tony Fleming wrote:


I have a Tesla Coil
Hi Tony:
I spent the last couple of hours searching through the various Tektronix
equipment that we have... I didn't find any Tesla coils.
Though a Google search on the exact phrase "Tesla Coil" got almost 8.1
million hits.
Sadly, I only got 148 hits on the exact phrase "Tektronix 530"
Best regards and best wishes.
Roy






!DSPAM:5e6e76e3248615491685301!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix & Windows


locked Re: Tesla Coil help needed

Tony Fleming
 

I understand, but people who are into electronics are also playing around
with "gizmo gadgets" like Tesla Coil.
That is the only reason I've mentioned it to you.
The problem with the Google search is it's limitations and in my case,
probably lack of expert use of Google search engine.
Many TC are there but my "kit" is specific to a design that I do not have.
On my side, I thought you might know someone or even yourself some
information to make this into a functional TC.
Have a great Sunday my friend.
Tony

On Sun, Mar 15, 2020 at 12:54 AM Roy Thistle <roy.thistle@...>
wrote:

On Sat, Mar 14, 2020 at 09:18 AM, Tony Fleming wrote:


I have a Tesla Coil
Hi Tony:
I spent the last couple of hours searching through the various Tektronix
equipment that we have... I didn't find any Tesla coils.
Though a Google search on the exact phrase "Tesla Coil" got almost 8.1
million hits.
Sadly, I only got 148 hits on the exact phrase "Tektronix 530"
Best regards and best wishes.
Roy




Tesla Coil - help needed

Tony Fleming
 

A new chat has been created:

I have a Tesla Coil kit but I don't have schematics that I can follow. All my parts are mentioned in my video: https://www.youtube.com/watch?v=Mt4y6j-foyY&list=PLv52A7rm-UViZEOlzZfZOB9Gl8cjS3ze5&index=2&t=0s
Or go to https://tonysfun.com/ and click on My Youtube Videos button. You can see more information here, before going to my videos.
I'm not an expert, but I take lots of precautions and use Variac Transformers and Isolation Transformers, among other steps to be safe.
I've built Jacob Ladders from Microwave Transformers and others, like in the video, that is for Neon Lights.....
I've tried for several month to contact people on youtube and other places, but many of them are older videos and I don't even know if the people are still around or using the youtube at all....
The seller mentioned in the video doesn't answer their phone and no option to leave a VM either.

If you know of anyone or any place that can help me with this project, I would appreciate it very much.

View/Join This Chat ( https://groups.io/g/TekScopes/chat/5224 )


Stan Griffiths' Memorial

 

I received this from Stan's daughters Valarie and Tricia:

Dear friends and family,
We are deeply grateful to all of you for all your expressions of sympathy,
and offers of support since Dad passed at the end of January, and we know
everyone is very interested in knowing our plans for a memorial gathering.
We regret to say that, due to Corona Virus concerns, we believe having any
kind of gathering in the near future might be hazardous to certain family
members' and dear elders health. The last thing we want to do is celebrate
the life and legacy of our father, and create a situation where we are
compelled to mourn others.
If you want to remember our father in some way during this time, please do
it by donating a little money to a reputable charity, like the ones listed
here: The American Diabetes Association, The Arthritis Foundation, The
American Heart Association, or the Bonnie Hays Small Animal Shelter. Dad
was an insulin dependent diabetic, a cancer and stroke survivor, and had
multiple heart procedures done in the last couple of decades, so any
assistance that can be given to support research into treatments, or meeting
the needs of low income sufferers of these illnesses, would be a fitting
tribute at this time.
We will make plans to gather and remember, and try to have a firm date by
the end of May, when we are truly past the current health crisis. We are
being cautious, perhaps overly so, but we deeply love our parents' surviving
siblings, so forgive us for clinging a bit.
We hope everyone in your circles continues in good health, recovers from any
illnesses quickly and without complication, and we will communicate our
plans to you as soon as we are able.
In gratitude,
Valarie and Tricia