I saw them in the context of test stands, the kind with big chassis, NEMA panels, pumps and sensors and stuff. Same idea in either use -- good for essentially unlimited cycles.
Tim
Didn't you know that mercury has been and is illegal?
They outlawed a naturally-occurring element? Sounds like something a politician might do.
Best regards, Spehro Pefhany
Sure. It's 10 years in prison for the possession of Lake Erie water.
Or trying to define pi to be exactly 3 to simplify calculations :-)
And turn all the wheels of all the cars hexagonal. ;)
Cheers
Phil Hobbs
The failures are unlikely, but you can work around them by using a fuse and having a second switch (needn't be an SSR) which is normally OPEN when the SSR is closed. The second switch, when the SSR is commanded OPEN, gets commanded CLOSED and blows the fuse. This kind of thing is common in interlocks (microwave oven door switches, for example).
Relays don't require regulated power. You can use a single transistor to switch the coil current, and just drive the transistor's base from the logic (with suitable current-limiting).
^^^^^^^^ You misspelled "inevitable".
Best regards, Spehro Pefhany
Triangular - takes one bump out of the square wheel.
Convenient if your road surfaces can be described as appropriate linked inverted catenaries.
Best regards, Spehro Pefhany
Well, what do you expect from the EC? They outlawed lead, forcing us to make PCs with "cheaper" silver..
That might be great flame-bait but it ain't so, at least not as stated. Example: there is a family of connectors using mercury raceways that work in rotated systems that are still produced and sold.
The old Baumanometer blood pressure tube type sphygmomanometer is still being produced - mercury column they call it. Still the world standard for accuracy. And I'm sure there are mercury barometers in every weather station worth it's salt - so mercury is not illegal.
-Tom
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