Johnythree

49 ms·

511.
by Johnythree 12y ago
Then how to Vacuum tubes work?
512.
by Johnythree 12y ago
Back in the 70's many of us scavenged our first Transistors from surplus computer cards. We went to great trouble to catalog the different boards so we could know what we were getting. see the old EEB magazine at: http://www
513.
by Johnythree 12y ago
Static Electricity. The meter movement is very delicately balanced, plus the plastic window can become charged. Waving your hand around affects the charge. You've just invented the Electroscope.
514.
by Johnythree 12y ago
Like many others, I've lived on solar power (no grid, no generator) for two decades now. No problems, no fuss. In rural areas, wind powered battery storage was commonplace 100 years ago. Perhaps if you bothered to do a little research.
515.
by Johnythree 12y ago
Plus for Brown Coal, you must run dryers powered by the waste heat. These take DAYS to get up to speed.
516.
by Johnythree 12y ago
The secret is good insulation and thermal design. If the house temperature doesn't fluctuate wildly day to night, your scenario doesn't apply. Plus you need a lot less heating.
517.
by Johnythree 12y ago
One of the standard tests to gain an EMC Compliance Certificate is a spark discharge test. Any experienced engineer will have a Spark Generator (Car Ignition coil, spark gap and short Dipole) to test to see if his latest project misbehaves
518.
by Johnythree 12y ago
The article says that it's not caused by Piezo effects, then goes on to describe exactly that.
519.
by Johnythree 12y ago
Yes, Balloons control their height by dropping ballast and/or releasing gas. When they eventually run out of ballast, they can no longer control the balloon.
520.
by Johnythree 12y ago
First Commercial Domestic portable perhaps: Definitely not the first Transistor Radio. The literature shows many earlier radios from various Research Laboratories and Radio Amateurs.
521.
by Johnythree 12y ago
Firstly my training is not primarily in USA FCC regulations, so the terminology will vary. However the basic principles still apply, as all of this derives from the international ITU agreements. The sources you link to refer to radiated emi
522.
by Johnythree 12y ago
CB'ers are not "Broadcasting". Broadcasting has a specific meaning and it is not permitted under a CB license. And yes, you are exempted for ownership while under development, but your organisation needs a written license or
523.
by Johnythree 12y ago
Actually no. Any experimental device must be covered by the appropriate experimental class license. Think about it. Any dumb CBer could claim that his homebrew Linear is "Experimental".
524.
by Johnythree 12y ago
The issue is not Licensing, but Type Approval. Even on the ISM bands ( http://en.wikipedia.org/wiki/ISM_band ) any transmitter must still be submitted for Type Approval Testing. The only exception to Type Approval is on
525.
by Johnythree 12y ago
There is another factor with Tracking: You size your array to cope with poor conditions, not best conditions. Worst conditions are when it's overcast, and not surprisingly the best alignment then is pointing straight up. So there is a
526.
by Johnythree 12y ago
> afaik is impossible to emulate with a digital amp Absolutely not impossible. If you can define it you can design it.
527.
by Johnythree 12y ago
You've just discovered that Electric motors use brushes on their commutators? Welcome to the 20th century. Brushes are intended to be replaced, and many manufacturers supply spare brushes in the original packaging. In the 21st century
528.
by Johnythree 12y ago
I feel exactly the opposite. All my life I've felt clumsy with spoken words. I much prefer to write. Writing gives me time to think and to edit and to find the odd word that eludes me. I do realise that not everybody feels this way. Ma
529.
by Johnythree 12y ago
In Australia, Jaycar (and to a lesser extent Altronics) have long taken over from Dick Smith. Jaycar stores stock a reasonable supply of electronics components, and has outlets in most parts of Australia. See http://www.jaycar.co
530.
by Johnythree 12y ago
Bordeaux Mixture is relatively benign. Copper, Sulfur and Lime are all naturally occurring chemicals, which (as you say) have been used to fight fungus for hundreds of years. Not all "chemicals" are evil.
531.
by Johnythree 12y ago
You must offer young recruits three things: Good Training, Good Wages and Good Employment conditions. They must have something to believe in, and to have hope for the future. When I was a young bloke (Australia) the Tech schools offered gre
532.
by Johnythree 12y ago
As a avid reader (and collector) of old books, one thing I hate is these fake computer generated book covers. If no cover is available, I would much prefer a simple text label. When I do find such a book, I waste no time in stripping off th
533.
by Johnythree 12y ago
Absorption refrigerator http://en.wikipedia.org/wiki/Absorption_refrigerator
534.
by Johnythree 12y ago
Any device which modulates the surrounding radio waves has the possibility of causing radio interference, so it will need licensing and type approval. And something which generates wideband crud will never be approved. This thing is not pas