Saturday, 2 February 2013

Hull coating responds to stimulus to remove bacteria | News | The Engineer

Hull coating responds to stimulus to remove bacteria | News | The Engineer
Duke University engineers have developed a material that can be applied like paint to the hull of a ship to dislodge bacteria, keeping it from accumulating on the ship’s surface

Tuesday, 6 November 2012

Solar LED Lights for Boat Cabin

Just installed some Lights and fans in a few cabins of a boat.  The system for the cabins will run off Solar PV.
The lights used are 4 watts each and two in each cabin.
There is an issue of the lights being harsh.  Since the height of the cabin is low, the lights come close to eye level.
I installed a cover over the lights and then it seems ok.  But the light then comes close to what you would get with a CFL.
After researching LEDs for the last 7 years and developing multiple LED products, mainly for street lighting and emergency & utility lighting like stairways, I am wondering whether LEDs are really suitable in a bedroom/cabin or living room areas.

Tuesday, 21 August 2012

Long Live the 555 Timer IC

Long Live the 555 Timer IC

Hans Camenzind, the designer of the popular 555 timer IC died this week in Silicon Valley.  He was 78.  My condolences to his family and friends.  Hans came to the U.S. from Switzerland in 1960.  He worked for a number of the early semiconductor startup companies before joining Signetics.  He designed the 555 while there in 1970.  The 555 was introduced in 1971 and was widely second sourced.  It is not likely he actually knew he was designing what has to be the world’s most widely used IC.  What EE has not used the 555 at one time or another?
Hans went on to found several companies like InterDesign and Array Design where he continued to design circuits.  In the mean time, the 555 became the base IC for many designs in the 1970s and 1980s.  Too bad he was not able to collect a royalty on each of the billions of chips more in the original article here.