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Messages - pentode

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1
When a partical passing through my chamber ionises the Argon, ( I hope  ),
the spark created will continue so I need to cut the HV after some
short time. As I am finding, switching 20kV plus HV is rather costly so I will make a short period timer to cut the mains supply to the NST, if I can
detect when a spark has been triggered by a partical and not spurious.


This is all a new ball game for me and the next part of the game is ordering
a small cylinder of Argon and a regulator.
to suit. I think these will fit the bill from Machine Mart who is near to me...……..
  https://www.machinemart.co.uk/p/argon-gas-cylinder

https://www.machinemart.co.uk/p/bottle-regulator-small-gas-bottle/?da=1&TC=GS-010120110&gclid=CjwKCAjwk7rmBRAaEiwAhDGhxAv38k0Mveuq4iDGj-d5h0VlQeo9blAsNy8uW2lPxb7esL1KbnfboRoC6RQQAvD_BwE


Maybe I ought to train up as a gas engineer. ;D

2
I thought about pressure build up in the chamber as sparking will warm up the Argon gas
and so pressure build up.

To keep an eye on this in a very cheap way I will fit a thin sheet of neoprene
onto a 60mm dia neoprene flat washer.  This will be fitted to the top
acrylic plate with a small hole drilled through it.

In this way any pressure increase or decrease will immediately show as a
depression or bulge in the neoprene. (dotted lines)
It will be interesting to watch this as sparking occurs.
I may put a position sensor on it too.

So I can keep an eye on pressure and cut the HV if too much.






3
Whilst waiting for more parts I built the power supply on the acrylic base mounted under the base. (It will be covered for safety as the voltage will be up to 25kV.  )
Initially the supply will be from a 15kV 30m/a  NST I stripped from an old SGTC I once built.

Nothing unusual in the power supply, just series HV diodes in a bridge with smoothing caps and bleeders wound around a piece of acrylic tube.
I always use nylon bolts, super glued to bases etc  to make cheap stand off HV insulators.

 


4
I hunted around for some small valves for gas inlet/air outlet.
As the whole rig is only 200mm dia x 250mm high I didn't
wish for large ones, so I bought two model railway engine valves. (60mm high)

Both mounted on the top acrylic plate where the argon gas is not inclined to escape
anyway as it is heavier than air.

The rig will be tilted to one side to fill the chamber, argon pushing the air up
and out.....I hope. :)  If a problem I shall have to  pipe the gas to the bottom of the chamber.

Now how to know when the chamber is full?
I shall use a lighted match burning at the exit valve and when it goes out
I should be nearly there !

Is there a better way?





5

Here's the 10 aluminium  discs with 20mm nylon spacers and nylon bolts.
Each alternate one to be connected for HV supply.
This is just a mock up to ensure everything fits together.   :)

Plates must be even to each other within about 1% so that's .2mm in this case.

Acrylic enclosure shown to have top and bottom plates attached, gas proof
with valves to supply argon and drain chamber of air.


6
Detection, Counting and Measurements / Now building a spark chamber
« on: April 24, 2019, 05:41:07 PM »
I don't suppose anyone is interested in dated spark chambers but...….
I have started building a circular one using Argon gas.
Circular is much easier to seal to ensure it's gas tight.

10 Aluminium plates 200mm dia spaced at 20mm giving a 180mm high display.
Adjustable 25kV DC across alternate plates, non pulsed.

Non pulsed HV was used in the very early spark chambers but one gets spurious discharges.

If my non pulsed system doesn't work I shall have to spend, spend, spend on scintillators and
photo multiplier tubes, amps and timing extras.

7
Welcome to the forum :)

Interesting way of demonstrating the path of the particle, so the high voltage pulse is triggered by the first PMT and stopped by the 2nd?

I know this is an old post but both PMT's have to be triggered by a partical before
the HV is applied to the plates.  If a partical only triggers one PMT, this
is ignored. 

8
Dual Resonant Solid State Tesla coils (DRSSTC) / Mechanical QCW !!
« on: March 15, 2019, 08:33:23 AM »
By profession I was mechanical rather than electronic so I tend to think
in this way and like mechanical solutions.

I am building my first QCW and wondered about generating the sloping
waveform normally derived from a ATtiny for the bus voltage.

So I rigged up a small DC motor running at about 6000 RPM which is
10 milli sec per rev. This can be reduced to give 20 milli sec etc

Mounted on this is a small cardboard (!) cam on either side of which is an led and  light detector.

Wih a suitable shape to the cam the output shown on my scope is the
wave form required !
It's not quite right at present as the cam profile needs slightly tweeking.

So that's  my mechanical QCW !

9
We have all seen and heard MIDI played on DRSSTC's and now
on a  4 piece QCWDRSSTC orchestra at
 
/>
The bass reproduction is better than DRSSTC.

But I await for an orchestra of QCW PLUS DRSSTC
to give a wider spectrum of sounds combined.
I getting very interested in it on a small scale,  We shall see. :)


10
Thanks Uspring.  That's got me a little further up
my learning curve.   :)

11
Sorry to be dumb, but could someone please explain the difference between
these two methods of working?
Thanks.

12
Dual Resonant Solid State Tesla coils (DRSSTC) / Blow up your top load !
« on: February 28, 2019, 05:22:18 PM »
Building my DRSSTC and considering my top load construction.
Bought the standard ali ducting to make it but had a mad thought...…

Scooter, garden tractor and car inner tubes are very cheap to buy,
SO. blow one up, cover in ali foil. Job done !!

The inner tube valve could be sealed for good or if
you consider inner tube may deflate over time then leave it.

Any thoiughs?

13
 FOUR 6800's. Gosh :)

That's a nice idea. I may put one on my 6800.
Better safe than sorry.
But putting something in series with bleeders puts
  a lot of faith in their continuity, don't you think? .  ;D



14
Ooops sorry, I read your nano caps as Micro farads !

Whilst on bleeders I have a 6,800 microfarad filter cap  working at 360 volts
to bleed.
Using  8k still leaves 40v after 2 minutes !

15
512 resistors. Wow!
Unlike your huge array I only have 18  poly 942  caps to fit so it's easy to put them in
my small 6 x 3 array.

Does your M10.2 R's take a long time to discharge caps?
The bleed current will be very low, at 1000 v being only
some 100 micro amps !
I would wait some time before getting hold of them :)

Thanks for suggestions though.

16
Thanks both for that.
Incidentally Max,on your excellent article on MMC
http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/mmc-tank-capacitor/
you show photos of MMC caps both with and without individual bleeders.
I daresay many are photos going back some time though.

17
Dual Resonant Solid State Tesla coils (DRSSTC) / Bleed R's for MMC caps ?
« on: February 21, 2019, 02:54:39 PM »
Looking at many MMC constructions on the net some have bleed R's across each cap but most
have none.

So, to bleed or not to bleed, that is the question?
 ..............Across caps rated at a few kV each!


 

18
As a raw beginner to DRSSTC I hesitate to write here but is your DC bridge supply to your
DRSSRC smooth with large caps?

19
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: STB16PF06L
« on: February 12, 2019, 08:16:33 AM »
Thanks Mads for that.

20
Dual Resonant Solid State Tesla coils (DRSSTC) / STB16PF06L
« on: February 11, 2019, 04:21:54 PM »
I have started to build Steve's DRSSTC 1.
I have hunted ebay and the net  (Digikey and Mouser etc) to source
the above Mosfet  in Steve's driver....
....https://www.stevehv.4hv.org/new_driver.html

Could anyone point me to where I might get itfrom, please?
Or a substitution that is available, maybe.

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