Posted by Jim Wilkins on June 9, 2011, 12:34 pm
To learn one has to be willing to risk failure and embarrassment. I've
had to be very careful of that when teaching a Ph.D. how to use
machine tools, or an assembly line girl a new delicate procedure.
Posted by Morris Dovey on June 9, 2011, 2:13 pm
On 6/9/11 7:34 AM, Jim Wilkins wrote:
As a guy who's learned a lot more from his failures than from his
successes, I strongly agree with both observations!
Learning isn't so much about getting something right the first time so
much as gaining the skills and understanding that, once learned, allow
doing something right consistently from then on.
Posted by Morris Dovey on June 5, 2011, 3:40 pm
On 6/5/11 12:06 AM, Winston wrote:
I like the ingenuity of the oven tracker - it /is/ clever.
I spoke with Duane some time ago to confirm that a PV panel like the
small trickle charger from Harbor Freight would be enough to power his
LED-based controller, a small DC gearmotor, and keep a small motorcycle
battery fully charged - and Duane's little circuit provides the
automatic end of day reset. I'd like to use this setup for my R&D test
The serious drawbacks in a third-world context are that these make users
dependent on an unreliable supply chain for both parts and repairs; and
make them vulnerable to anyone who sees advantage in monopolizing or
breaking that chain.
Posted by Jim Wilkins on June 5, 2011, 4:41 pm
True. The drawback for us is that we lack their shop skills to keep a
1960 Land Rover or 1920 steam engine running with locally made parts.
Posted by Winston on June 5, 2011, 4:45 pm
Morris Dovey wrote:
The third world suffers as the dumping ground for the world's
eTrash. That pile can be mined for LEDs, transistors and all kinds
of other nifty parts. PM motors could be re-purposed as micro-
wind chargers to keep batteries topped up. An array of LEDs could
be put in series-parallel to act as our sun sensors and other
LED arrays could be in parallel with the wind chargers to help
maintain the batteries.
I've disassembled several microwave ovens for instance.
They are a gold mine of switches, LEDs, relays etc.