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Topics - pentode
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1
« 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.
2
« 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 !
3
« on: March 04, 2019, 08:24:45 AM »
Sorry to be dumb, but could someone please explain the difference between these two methods of working? Thanks.
4
« 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?
5
« 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!
6
« 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.htmlCould anyone point me to where I might get itfrom, please? Or a substitution that is available, maybe.
7
« on: January 26, 2019, 12:09:38 PM »
Could someone please tell me which of these two queried pins is the positive connection on a IF-D95T opto receiver? Thanks.
8
« on: October 11, 2018, 03:21:53 PM »
Hi, Has anyone had a stroke due to using any type of Tesla coil. SGTC, SSTC etc.
10
« on: July 05, 2018, 05:18:10 PM »
I wish to run two independent VTTC's (GU81's) in close proximity to each other. The pri/sec coils will have a gap betwen them of about 100mm.
I cannot foresee any snags but someone else may know otherwise, please.
11
« on: June 17, 2018, 09:14:12 AM »
There doesn't seem much interest in VTTCs here, only one thread, but...…. I've just built VTTC using 2 GU81 valves. 2 MOT's in parallel. Full wave rectification. Sec coil 750 turns. Getting a HV variable capacitor in order to tune the primary. Will be modulated to play Bach's Toccata and Fugue, not for organ but for sparks ! Have tested it with a 555 astable osc so far and it sounds OK.
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