Search found 56 matches

by Morgan Jones
Mon Mar 11, 2024 3:25 pm
Forum: Speakers
Topic: TG "The Loudspeaker" Build (Sort of)
Replies: 85
Views: 8291

Re: TG "The Loudspeaker" Build (Sort of)

Nice work. I was going to warn you that although a router does a beautiful job, you get a lot of leverage on the trammel and it's easy to overload the router's bearings. Looks like you discovered it for yourself; I wrecked my Elu router that way. I then bought a much bigger router. Which I don't muc...
by Morgan Jones
Fri Mar 08, 2024 5:13 pm
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Could very well be. Either way, it doesn't do what I hoped it might, and further thought and testing says extra poke wouldn't help. So I haven't spent 250 Euro or wasted time making something of my own. I suppose you could call that a win. And I've learned something. I've also noticeably flattened t...
by Morgan Jones
Fri Mar 08, 2024 11:58 am
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

And I've just measured the current drawn from those AA cells. 1.92A! No wonder it pulses 1s on, 1s off - the battery needs time to recover. All in all, a dangerous piece of kit. No need to make anything pokier - if this can't produce a visible glow from residual gas in a valve, then it's probable th...
by Morgan Jones
Fri Mar 08, 2024 10:04 am
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Further experimentation shows that you need to have your fingers on the contacts or surface of a fluorescent tube or regulator valve to make it work. But I don't recall you doing that? And it's certainly not in the instructions. I don't much like having my fingers near the tip of a high voltage. Per...
by Morgan Jones
Thu Mar 07, 2024 10:55 pm
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

I'll measure what it produces first. But it certainly didn't glow a fluorescent tube when held in contact.
by Morgan Jones
Thu Mar 07, 2024 7:43 pm
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Arrived. Disappointment. Insufficient poke. Just about managed to produce an orange glow in an 85A1 neon). I am told that:

If it's blue, it's air.
If it's green, it's barium.
If it's pink-purple it's argon.

And Jack's large nixie managed a blue glow with his tester, which I assume is pokier.
by Morgan Jones
Wed Mar 06, 2024 10:24 am
Forum: Everyones Projects
Topic: On My Bench.
Replies: 93
Views: 30826

Re: On My Bench.

Ta for your thoughts all, I was wondering if there were any specific characteristics that Tantlum caps had that electrolytic don't, or vice versa. High ESR. (And very variable.) That's why they're recommended for regulators - the high ESR prevents a high Q resonant circuit forming. They're very fra...
by Morgan Jones
Tue Mar 05, 2024 10:57 am
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Ordered.
by Morgan Jones
Tue Mar 05, 2024 10:21 am
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Don't you just hate people who hide what they've done?
by Morgan Jones
Tue Mar 05, 2024 9:57 am
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

That would be super. If you're right in your guess, it should destroy LW reception. Presumably, you see characteristic colours associated with different gasses? I looked at the ends of the resistor wire fractures under a microscope and found all sorts of impurities instead of a nice metallic surface...
by Morgan Jones
Mon Mar 04, 2024 3:48 pm
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Photograph would be nice. Measurement would be really nice, but if (as I suspect) it produces high voltage, but AC, it would be difficult to measure. Inside it, I would expect a ferrite transformer, with or without voltage multiplier (which should be easy to spot). Waving a scope probe a foot away o...
by Morgan Jones
Mon Mar 04, 2024 11:10 am
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Nice to see you there. It seems the Voltarc company went bust some time ago, and I couldn't find your natty little tester anywhere. And idea of what it produces on its aerial? AC, DC? Voltage? It wouldn't be difficult to knock up something.
by Morgan Jones
Sat Mar 02, 2024 5:55 pm
Forum: Assorted Stuff
Topic: Audiojumble 03/03/24
Replies: 36
Views: 8806

Re: Audiojumble 03/03/24

Tricky. I noticed a Radford STA15 for sale recently that was signed internally by Eric Clapton. The seller seemed to think that would increase its value. I think at Tonbridge knowledge that former owner might have been Clive Sinclair would probably reduce value. You never can tell - somebody might b...
by Morgan Jones
Thu Feb 29, 2024 11:44 pm
Forum: Assorted Stuff
Topic: The Quackery Thread
Replies: 360
Views: 192450

Re: The Quackery Thread

Nice picture. I didn't measure it myself, but I was told that RH was typically near zero and that it caused a lot of problems. Perhaps the techies just enjoyed winding up the suits by insisting on cotton. Got zapped a lot in the BBC Wood Norton canteen. Everyone quickly learned not to touch the pill...
by Morgan Jones
Thu Feb 29, 2024 8:05 pm
Forum: Assorted Stuff
Topic: The Quackery Thread
Replies: 360
Views: 192450

Re: The Quackery Thread

Could be right, too. I do like a nice bit of physics. However, when I visited a lab in a desert (low humidity, doncher know), we were instructed to wear cotton only because of the static problems. This was fine for me because as commented by a friend, "Sartorial and elegance are just words to y...