Member postings for Geoff Theasby

The only things I can think of with part-liquid content are electrolytic capacitors, the often black, tubby things mounted upright on the circuit board. Or an LCD display, but that should be colourless. Either way, something appears to be faulty.

Geoff

Have you checked it for radioactivity?

Geoff

Have you a Smartphone? There are tachometer apps available.

Geoff

Neil,

I'm not sure I would live long enough! Look up studio-octavio for more examples.

I suggested to Cherry Hill that it would make a good model, but she isn't making any more.

Geoff

How about this, Neil?

Geoff

How's this for a project?

Edited By JasonB on 01/09/2016 07:25:32

JA, for steampunk, Google:

Novel, Pavane by Keith Roberts

Dance music, YouTube - Whitby Gothic Style

Videos, YouTube - Sir Reginald Pike-Devant Esq., and Professor Elemental

I have the honour to be, your humble and devoted servant, Sir.

Well now, Michael, the LED packages are two-terminal. The photographic filters reveal one main light spot in the centre of each package using any colour. The LEDS are on a reel, probably soldered & mounted automatically. Obviously, the diodes must be the same way round, ie anodes together, cathodes together. So, they are probably as Les said. Thank you, Les.

Geoff

Drilling and tapping Mg shouldn't be a problem, since any heat will be conducted rapidly away. Consequently, the metal in the mass never gets hot enough to ignite. Dust and swarf, though, Beware! As it is light and insubstantial, heat rapidly builds up.

Geoff

Les, I found this just now.

https://en.wikipedia.org/wiki/Light-emitting_diode

Geoff

Sorry, Russell, yes.

John, white LEDs are actually three differently coloured devices in one package, possibly with two blues, since they need to seem brighter, as stated, making four. Then a phosphor is applied overall, which glows white. I will have a look at them using my photographic filters, to see if anything is revealed. NB, this is off the cuff, I haven't checked it for accuracy.

Geoff

Michael, no.

After being ON all day, they are still cool to touch (Stuck below a wooden shelf) whilst the supply is only warm. If it proves to be a problem, replacements are quick and cheap, or aluminium strip can easily be inserted.

Geoff

Neil, do you mean these?

https://www.youtube.com/watch?v=riYfs7yz5AI

Geoff

What Neil said. It's like the difference between a plain bulb and a spotlight. Checking with my photographic lightmeter reveals an illumination difference of 4 x between the 4 foot fluorescent tube and the LED strip, with the tube light being brighter. However, the eye perceives little difference (on a logarithmic scale) the LEDs are mechanically robust, and consume far less energy, besides costing less in capital outlay. If you need more light, a second or third etc., parallel strip may be fitted for a few more pennies.

Geoff

Can't find the recent discussion on this topic, but spurred on by it, I bought a reel of LEDs with adhesive backing, running off 12 volts and trimmable to length. This was because one of my basement fluorescents packed up, with a faulty fitting. A new one is £18 and tubes about £5. These LEDs cost £7 for 5 metres (600 in quantity, or about 1p each) I cut off 600mm to go under the shelf over my computer, fed it with 12 volts from a redundant 'wall wart', and Shazam! Let there be light, and there was light, and Lucifer was consigned to the outer darkness. Now, simple unrectified/unregulated power supplies may cause the LEDs to flicker when looking directly at them, but the reflected light appears steady. As LEDs are diodes, they only conduct every half-cycle of the mains, so appear to flicker at 25 Hz. Rectified power supplies, which provide DC, should not have this problem.

Geoff

My Dad used to be a car mechanic (Engine fitter in WWII) and he gave me his Britool socket set. Beautiful stuff, only parted with after many years because it was Imperial, not Unified or Metric as my cars then were. I gave it to a mate who repairs old British motorbikes.

Geoff

Michael G, Great Scott, No! I wasn't having 'dig' at anyone. I just thought the words fitted. That they were part of a hymn or carol was coincidental, I might have used another popular phrase or statement in other circumstances.

Readers' personal beliefs are not mine on which to pass comment. If I have offended you, I apologise.

Geoff

The Tenon of Wildfell Hall,

Here is the Key

Geoff

<Sings> Oh, come let us avoid them, Oh, come let us avoid them, Oh, come let us avoid them,...

Moving quickly on, "The Turn of the Screw", Henry James, not forgetting "The mills of God grind exceeding small", Longfellow, from Plutarch.

Geoff

I'm just an old square, that's me to a 'T'.

Geoff