Date   

locked Re: Tesla Coil help needed: NOT RELEVANT TO TEKTRONIX

Tom Gardner
 

I suggest EEVBlog forum.

The denizens are welcoming and have significant experience in many topics. There are many cross-posts between here and there.

On 16/03/20 22:24, Tony Fleming wrote:
Sorry, I don't know where to ask my Tesla Coil question.
Please let me know where to do so.
Thank you very much.


locked Re: Tesla Coil help needed

Tony Fleming
 

Wow, you had interesting job!
I also had interesting jobs, designed stuff for Implement Deals like John
Deere... Engine stands, tire stands.... I also invented shop crane that
lifter 6000 Lb 21 FT high and you were able to push it around the repair
shop....
Made a smaller engine lift crane that was not patented but is sold in may
auto parts stores in these days! Too bad I did not have the resources or
the Gill Meyers who hired me when I was in the USA only 3 month with very
limited English.
I had lots more "brain" than but not much is left in these days... ha ha ha
Electronics, electricity and works with CNC machines as a service man back
in 70's was also lots of fun, but I've escaped from Czechoslovakia in sumer
1981 to Lincoln, Nebraska, before working for Gill.
In mid 80's I was also a photographer for football team at University of
Nebraska, that was also interesting. work.
There is more but it isn't time for that now.
Over 10 years ago I started to play with Arduino and it let to today, where
I have so many hobbies I can't take on any other interests.
But you had to be smart to work with the "components, powered by a 30 kHz
oscillator through a small pot core transformer" and other stuff you made.
It would be nice to have you as neighbor and you could teach me lot more
than I know.
Thank you again Ernesto!

On Mon, Mar 16, 2020 at 10:33 AM Ernesto <ebordon@...> wrote:

Hi Tony,

It's my pleasure!

When I was still working I designed a 100 kV supply, and it was fun. Its
purpose was to power up a minitron tube used in oil well logging.
It was a ladder of nearly 30 stages, made with conventional components,
powered by a 30 kHz oscillator through a small pot core transformer.
It all fitted into a narrow long tube filled with SF6 gas to improve
dielectric insulation.
There were no sparks, and any disturbance was irrelevant because it worked
in an oil well at thousands of feet deep
and because of the depth it had to work at high temperatures up to 350
degF.
There could have been danger. The minitron tube is a source of neutrons
(radioactivity) that can be lethal.
But i survived, ha ha ha

Regards
Ernesto




locked Re: Tesla Coil help needed: NOT RELEVANT TO TEKTRONIX

Bob Albert
 

I suggest you go to EEVblog where almost any topic can appear.

On Monday, March 16, 2020, 03:25:06 PM PDT, Tony Fleming <czecht@...> wrote:

Sorry, I don't know where to ask my Tesla Coil question.
Please let me know where to do so.
Thank you very much.

On Mon, Mar 16, 2020 at 10:24 AM Dennis Tillman W7PF <@Dennis_Tillman_W7pF>
wrote:

AS IT CLEARLY SAYS IN OUR HOME PAGE:
TekScopes is all about classic Tektronix test equipment, its use, repair,
and collecting.

THIS IS IN NO WAY RELATED TO TEKTRONIX

This has already been pointed out to you by other members of TekScopes.

Please take your discussion about Tesla Coils off line or start a group of
your own.

Thank You,

Dennis Tillman W7pF
TekScopes Moderator



--
Dennis Tillman W7PF
TekScopes Moderator




locked Re: Tesla Coil help needed: NOT RELEVANT TO TEKTRONIX

Tony Fleming
 

Sorry, I don't know where to ask my Tesla Coil question.
Please let me know where to do so.
Thank you very much.

On Mon, Mar 16, 2020 at 10:24 AM Dennis Tillman W7PF <@Dennis_Tillman_W7pF>
wrote:

AS IT CLEARLY SAYS IN OUR HOME PAGE:
TekScopes is all about classic Tektronix test equipment, its use, repair,
and collecting.

THIS IS IN NO WAY RELATED TO TEKTRONIX

This has already been pointed out to you by other members of TekScopes.

Please take your discussion about Tesla Coils off line or start a group of
your own.

Thank You,

Dennis Tillman W7pF
TekScopes Moderator



--
Dennis Tillman W7PF
TekScopes Moderator




Re: recommended ESR meters these days

Tony Fleming
 

Sorry, I do not know what it is about. You need to tell me exactly what you
like to say - I'm little slow at times.

On Sat, Mar 14, 2020 at 7:37 PM Bob Albert via Groups.Io <bob91343=
yahoo.com@groups.io> wrote:

Did you read this?
Tesla coil

|
|
|
| | |

|

|
|
| |
Tesla coil

Tesla used these circuits to conduct innovative experiments in electrical
lighting, phosphorescence, X-ray gener...
|

|

|


Bob


On Saturday, March 14, 2020, 05:08:48 PM PDT, Tony Fleming <
czecht@...> wrote:

Thank you very much for a very quick reply!
I'm not as smart in these fields as you are, but I love to play with stuff
and make some sample "demo units" that would put a "growing seed" in some
person or a kid's head, like it happen to me, when I was young. I think the
hands-on and some sound (or any visual effect) created by the
experiment is very powerful. At least it was in my brain, but life took me
to a different route and I had to take care of my family and ..... Now,
when kids are on their own for a while, is the time to play with my toys!
Everything to me is a toy because I'm young in my heart and brain - not the
body.... I love oscilloscopes and DMM's or special meters that I own. I'm
very visual, photography was and is my other hobby and even
professional work in the past .... so seeing something that we aren't
equipped to see, electrons + many other like oxygen....is something that I
love. I love to show this to anyone who wants to, because I love people
very much. I also play with Arduino and ESP32/8266.... Raspberry PI.... but
it is hard for me to remember stuff. Dyslexia and Fibromyalgia with PTSD
combination ++ some other health stuff is slowing my brain down, but I try
and try again, until I get it or not.
I've made some simple Jacob Ladders with neon sign transformer or from a
Microwave Oven Transformers.... but I don't know how to make stuff on my
own, without having schema and I love to have a video also, of the project
when I can. So I can "copy" someone's design but now I can't make complex
stuff on my own.
Example is my Tesla Kit, that my friend gave me - it is here on the
youtube:

https://www.youtube.com/watch?v=Mt4y6j-foyY&list=PLv52A7rm-UViZEOlzZfZOB9Gl8cjS3ze5&index=2&t=0s
(I
also started not long ago a website: https://tonysfun.com/ )
I have the parts (not knowing if all parts are there or not for sure, but
most are there) and one sheet of some instructions, but that is all. I've
asked many youtube people, who made these powerful Tesla Coils, but nobody
answered at this time.
Would you be willing to take me one step at a time and make a schema that I
can follow?
I'm very careful and take many precaushions before playing with Kilovolts
or even just with any voltage, since I hate to burn or break anything....
I' also on Skype (under czecht@... - I was born in Czechoslovakia
but I escaped in 1981 to USA) so we could see each other while talking
about anything you like me to know.
One of the scopes I have is older Tektronix 2465 DMM, it came busted but a
simple switch cleaning fixed that problem.
Also I have a modern 100 Mhz color scope, Aktakom - I think it is a copy of
and a OWON.... can't remember the model number- and a Aktakom
generator...+ many more "gizmos", as I call them.
But I would not know how to make a oscilloscope from parts, but I do
desolder many boards, TV's ... whatever I find on the curb or someone gives
me, so I can get parts I can use.
I'm willing to learn if you like to share your time and knowledge, since I
work for myself as a computer repairman.... Another hobby that became
business, but I love computers like my Oscilloscopes....
Sorry for a long email and thanks again for your reply.
Have a great weekend.
Tony


On Sat, Mar 14, 2020 at 12:04 PM Ernesto <ebordon@...> wrote:

On Sat, Mar 14, 2020 at 09:07 AM, Tony Fleming wrote:


Thanks for your information. I'm not an engineer in electronics, but I
do what
I can, including buying meters that I use. I do have couple scopes,
but I
usually just pull out my meter for the job at hand..... By same tocan
I'm
interested in learning electronics, after 50+ years of hiatus so it is
little
harder to learn than when I was young.
If you have a place where I can learn stuff like you've mentioned, I'm
all
ears.
Have a great weekend.
Hi Tony,

First of all, there is no reason you cannot learn electronics after a 50+
hiatus. I keep learning electronics, some of it from this group, after
70++ years of existence. Instead being harder, as seniors we have more
patience and perseverance.

I assume you have a good background in physics, electricity. To progress
to "electronics" it is best to have some passion. Nothing inspires this
passion better than the oscilloscope, the KING of the electronic
instruments.
The oscilloscope is the only means to VISUALIZE the abstract electrical
signals. This visualization stays with us all life long and makes
electronics something CONCRETE and familiar.

So if you want to become expert in electronics, my advice is: BUILD AN
OSCILLOSCOPE FROM SCRATCH (with some nice CRT tube, of course)

Right after college I did this for a couple of months, designing and
building with an old 4 inch CRT an oscilloscope in the style of
Tektronix.
It was a dual-channel with all options, triggered with all options plus
an
X-Y display, and built 100% with transistors in 1971. With an 1800 V
high-voltage supply running at 35 Khz, I designed and built the HV
transformer and even the 50 Hz (in my country) transformer from their
basic
materials. All with little money, ha ha!

This launched my career of designer of analog electronics. At that time
the progressive introduction of integrated circuits allowed me to learn
the
digital stuff, and I became a champion of designing WITH ECONOMY
(minimum
number of components). This economy stopped being an issue shortly
thereafter, so I changed to optimum functionality no matter what, and the
field of firmware, microprocessors and programmable LSI gave me a lust
for
complexity. Finally I became a software programmer, "software architect"
and now... happily retired... I am finally back at tinkering with
hardware
and oscilloscopes.

There is a reason why some electrical engineers are attracted to a
"TekScopes" grouop instead of "Power Distribution" or "High Voltage
Transmission Lines" discussion groups.

Ernesto










locked Re: Tesla Coil help needed: NOT RELEVANT TO TEKTRONIX

 

Ernesto,
AS IT CLEARLY SAYS IN OUR HOME PAGE:
TekScopes is all about classic Tektronix test equipment, its use, repair, and collecting.

IT IS NOT ABOUT TESLA COILS!
Please take you conversation about Tesla Coils off line. In other words contact the others directly, or start a group of your own.
Thank you in advance for restricting you interest to Tektronix products
--
Dennis Tillman W7PF
TekScopes Moderator


Re: Tektronix Probe Tips DIY

Bert Haskins
 

On 3/16/2020 4:30 AM, Tom Gardner wrote:
Similar techniques can be extended to add a low-inductance ground bayonet/spear to a probe, as found in the HP10020 1.5GHz passive resistive divider probe:
https://www.eevblog.com/forum/testgear/fifty-ohm-probes/?action=dlattach;attach=135831;PHPSESSID=lohekcsu194l3qpirrh4ps38p2
or the hp10431 "high" impedance passive probe:
https://www.eevblog.com/forum/buysellwanted/how-much-should-i-pay-for-a-500mhz-10x-passive-oscilloscope-probe/?action=dlattach;attach=109603;image

Suitable materials are Shapeways' nylon (slightly flexible), or DirtyPCB's SLA (smooth high resolution). The latter is stunningly cheap, but takes a while to arrive.


On 16/03/20 02:45, Harvey White wrote:
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


All of the .025 (2.54mm) female header clip connectors that I have been able to buy lately are worse than !@#$ !!!!!.
After as little as three insertions they will fall right off of the pin.

These are sold as Dupont 2.54mm.

This is an example of what I am using:

https://www.ebay.com/itm/610pcs-2-54mm-Dupont-Housing-Connectors-Pin-Header-Male-Female-Crimp-Pins-Kit/264156238323?hash=item3d80f051f3:g:-EEAAOSw5YlcRsNs.


I have a very few of the US made ones from several years ago that I ration out for just the type of applications that you are talking about.

I have an ongoing need for custom cables (headers ) that use these pins but the extremely low quality of the clips is causing me fits.

An even worse example is when the the female pin is use on a board like Arduinos.

Does anyone know where to get clips of anything like decent quality?

Thanks,

  Bert



locked Re: Tesla Coil help needed

 

Hi Tony,

It's my pleasure!

When I was still working I designed a 100 kV supply, and it was fun. Its purpose was to power up a minitron tube used in oil well logging.
It was a ladder of nearly 30 stages, made with conventional components, powered by a 30 kHz oscillator through a small pot core transformer.
It all fitted into a narrow long tube filled with SF6 gas to improve dielectric insulation.
There were no sparks, and any disturbance was irrelevant because it worked in an oil well at thousands of feet deep
and because of the depth it had to work at high temperatures up to 350 degF.
There could have been danger. The minitron tube is a source of neutrons (radioactivity) that can be lethal.
But i survived, ha ha ha

Regards
Ernesto


Re: Tektronix Probe Tips DIY

 

Hi Harvey,
This is a nice application of 3D Printers. Thanks for sharing it with us.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Harvey White
Sent: Sunday, March 15, 2020 7:46 PM
To: TekScopes@groups.io
Subject: [TekScopes] Tektronix Probe Tips DIY

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







--
Dennis Tillman W7PF
TekScopes Moderator


locked Tesla Coil help needed: NOT RELEVANT TO TEKTRONIX

 

AS IT CLEARLY SAYS IN OUR HOME PAGE:
TekScopes is all about classic Tektronix test equipment, its use, repair, and collecting.

THIS IS IN NO WAY RELATED TO TEKTRONIX

This has already been pointed out to you by other members of TekScopes.

Please take your discussion about Tesla Coils off line or start a group of your own.

Thank You,

Dennis Tillman W7pF
TekScopes Moderator



--
Dennis Tillman W7PF
TekScopes Moderator


Re: Type O plugin

Albert Otten
 

I think the AM501 for the TM frames should be considered as successor.
Albert


locked Re: Tesla Coil help needed

Tony Fleming
 

Ernesto, thank you very much for your explanation! It now makes more sense
to me (as I say, in my head)! I hope I can put together some schema and
I'll see the recommended video and websites.
You have a wealth of knowledge and I'm very pleased that you explained it
to me in principle of the TC and also what the i.e. resistors do ...
I would hate to make something without understanding it well, before making
attempt to assemble it or play with it.
I'm planing to demo this for our show in early fall here in Lincoln,
Nebraska.
Everyone, kids, young, older and old people love anything that makes sparks
and sound + lightning - that is how I draw them to my tables, where I let
them play with some of my demo units.
I like to plant the seed in their head, just like Mr. Helebrant did it in
1969, when I was about 15 years old. Now I've return the favor and get
other excited about electronics, 3D printers.....
Have a great week and thank you for your time!
Tony

On Sun, Mar 15, 2020 at 3:29 PM Ernesto <ebordon@...> wrote:

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






Re: Tek 576 Curve Tracer HV Replacement Transformer

Mlynch001
 

Cores have arrived and the actual production work began late last week. Coils are wound, varnished, encapsulated and finally, tested. I have insisted that quality and reliability have priority speed and cost. After the final testing phase at the factory, transformers are shipping to me immediately. I will distribute the individual orders ASAP once the parts are received here. I estimate 10-14 days until I am able to mail the first components.

Thank you for your patience.

--
Michael Lynch
Dardanelle, AR


Type O plugin

cmjones01
 

I've just acquired a Type 'O' operational amplifier plugin, in good,
tidy condition apart from the lack of a few valves (the 6DJ8/ECC88s
had disappeared, of course, and a couple of 12AU6s had gone astray).
I'm looking forward to getting it working

I find the idea of being able to perform mathematical waveform
manipulation in the analogue domain fascinating, and it's certainly a
great trick for my trusty 535A to have up its sleeve.

My question is, though, why didn't the later transistorised scopes
have a similar plugin? There was the 3A8, but nothing equivalent for
the 5000 or 7000 series as far as I can tell. I can see that digital
scopes removed most of the need for such a plugin in the 1980s, but
that leaves a gap after the 500/560 series. Maybe the idea of the
operational amplifier's flexibility is nice, but it turned out not to
be so useful in practice?

Chris


TDS3000B calibration

 

Why am I thinking of running a calibration? The trigger point is not
indicated correctly for faster signals - if I feed it a "fast rise" pulse
from the CG551AP, the trigger point is shown at about the 2% point of the
step signal even though the trigger is set to 50%. There a few other
things that weren't quite "on the mark" that I noticed as I ran through the
Training Manual. I'm hoping a calibration will sort all this out.

Timebase though appears "spot on" which is good. Is it possible to skip
steps in the calibration - no point re-doing the timebase calibration if it
is right ...

Before I attempt to run the full calibration procedure on my TDS3000B, I
want to be sure that I can generate all the necessary signals, and that the
nature of the signals is clearly called out in the calibration process once
it starts running.

I have SG503, SG504, CG551AP, and a CG5001 (with pulse heads for the last
two).

Cheers
David


TDS3000B timebase scaling

 

Instead of the classic 1-2-5 steps, the TDS3000B out of the gate uses 1-2-4
which I rather dislike (though I understand why it may have been done that
way).

Is there any way to change this?

David


locked Re: Tesla Coil help needed

stevenhorii
 

Jean-Paul,

Yes - I am a radiologist, though now semi-retired.

My specialty uses a lot of high-voltage equipment. X-ray generators put out
120kV or more and at sufficient current to kill you, so I leave working on
this stuff to the service people. They did show me a bad x-ray tube that
was arcing - we watched it through a lead glass window. It looked like a
flash tube (a very bright one) going off.

I am sure you will respect the voltage that a Tesla coil can put out,
though the current is pretty low.

Steve

On Mon, Mar 16, 2020 at 3:23 AM Jean-Paul <jonpaul@...> wrote:

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

Brian
 

Hi , the PCX200 card that I currently use is a PCI card , probably still obsolete but fits in a more up to date pc.The polaroid film I nearly always used was the 665 as it had a negative as well , the 107 was used when I wanted to push the speed to its max for something very fast and likely single shot . The camera being only B/W is no problem as the films used were also .These days I have a TDS744 and hardly ever need the cameras .
Brian

On Monday, 16 March 2020, 02:59:14 GMT, Chuck Harris <cfharris@...> wrote:

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


Re: Tektronix Probe Tips DIY

Tom Gardner
 

Similar techniques can be extended to add a low-inductance ground bayonet/spear to a probe, as found in the HP10020 1.5GHz passive resistive divider probe:
https://www.eevblog.com/forum/testgear/fifty-ohm-probes/?action=dlattach;attach=135831;PHPSESSID=lohekcsu194l3qpirrh4ps38p2
or the hp10431 "high" impedance passive probe:
https://www.eevblog.com/forum/buysellwanted/how-much-should-i-pay-for-a-500mhz-10x-passive-oscilloscope-probe/?action=dlattach;attach=109603;image

Suitable materials are Shapeways' nylon (slightly flexible), or DirtyPCB's SLA (smooth high resolution). The latter is stunningly cheap, but takes a while to arrive.

On 16/03/20 02:45, Harvey White wrote:
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

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?