Search found 56 matches
- Mon Mar 11, 2024 3:25 pm
- Forum: Speakers
- Topic: TG "The Loudspeaker" Build (Sort of)
- Replies: 63
- Views: 5605
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...
- Fri Mar 08, 2024 5:13 pm
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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...
- Fri Mar 08, 2024 11:58 am
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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...
- Fri Mar 08, 2024 10:04 am
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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...
- Thu Mar 07, 2024 10:55 pm
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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.
- Thu Mar 07, 2024 7:43 pm
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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.
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.
- Wed Mar 06, 2024 10:24 am
- Forum: Everyones Projects
- Topic: On My Bench.
- Replies: 84
- Views: 28644
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...
- Tue Mar 05, 2024 10:57 am
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
Re: Audiojumble 03/03/24
Ordered.
- Tue Mar 05, 2024 10:21 am
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
Re: Audiojumble 03/03/24
Don't you just hate people who hide what they've done?
- Tue Mar 05, 2024 9:57 am
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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...
- Mon Mar 04, 2024 3:48 pm
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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...
- Mon Mar 04, 2024 11:10 am
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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.
- Sat Mar 02, 2024 5:55 pm
- Forum: Assorted Stuff
- Topic: Audiojumble 03/03/24
- Replies: 36
- Views: 6707
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...
- Thu Feb 29, 2024 11:44 pm
- Forum: Assorted Stuff
- Topic: The Quackery Thread
- Replies: 360
- Views: 190278
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...
- Thu Feb 29, 2024 8:05 pm
- Forum: Assorted Stuff
- Topic: The Quackery Thread
- Replies: 360
- Views: 190278
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...