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Posted by Jimmy Mayfield on February 18, 2010, 1:01 pm
Thanks for the link. I like the adaptability of that one, especially
the rpm limiter and acceleration rate control. I'll see if I can
locate a dealer when I get home today.
Posted by m II on February 20, 2010, 7:59 pm
Jimmy Mayfield wrote:
( I don't know to what accuracy this will maintain the rpm, but the idea
s are great)
A nice governor setup using a very inexpensive microcontroller:
For other uses, Temperature, voltage, light, proximity and RPM sensors
are easily connected, as is a computer if you need to see actual numbers
on a terminal. The six dollar chip even has a serial communications port
The Arduino processor and development board is roughly 30 dollars US. An
USB cable connects it to to the computer for downloading your software
into it. The software is a free download and contains enough samples and
tutorials to more than get you going. A 'Starter kit' is available at a
higher cost for those without an electronics junk box. Extra 28 pin
processors are around 5 to 8 dollars.
Once the processor is programmed, it can be removed from the board and
relocated in your relay/switching cabinet. Then, a new processor may be
programmed for your next project. The chips are said to last for more
than 100 years, depending on ambient temperature. There's a good
possibility one may outlive me.
Many inputs/outputs. The pins can be programmed as either direction.
Due to the insane amount of spam and garbage,
I block all postings with a Gmail, Google Mail,
Google Groups or Hotmail address.
I also filter everything from a .cn server.
For solutions which may work for you, please check:
Posted by Bob F on February 20, 2010, 8:07 pm
m II wrote:
I wonder how many have lasted that long.
Posted by Jim Wilkins on February 21, 2010, 1:27 am
The bare chips are small enough to fit into the time machine's
chamber. The ones not incinerated or caked with what we think is ape
drool still worked.
Seriously, high temperatures accelerate the known long-term failure
mechanisms of circuits and sushi. I built a test machine that could
make a transistor live its whole life in 5 minutes by regulating the
internal junction temperature to over 150C.
Posted by m II on February 21, 2010, 2:33 am
Jim Wilkins wrote:
That stuff plays havoc with surface mounted devices.
I barely made it back from Bell Labs circa 1947. I didn't want to go,
but SOMEONE had to give them the germanium junction idea.
The ape drool is another matter and the little side trip to the Zoo is
not a matter for discussion at this time.