Design

RF energy harvesting project
Hello, I am working on a senior design project that harvests energy from a 45watt UHF Ham Radio transmitter. Currently I am getting 3.4v peak-peak at the receiving antenna. When I attempt to rectify the signal into a DC voltage across a Schottky diode I am losing nearly all of my voltage (it drops to around 500mv).... 11 Jul 2010 00:46

Where is Archimedes Lever??
On Jul 7, 12:43 am, Neanderthal <da...(a)gottafindawomanrighton.org> wrote: On Tue, 06 Jul 2010 20:48:28 -0700, "JosephKK"<quiettechb...(a)yahoo.com> wrote: On Wed, 07 Jul 2010 08:31:10 +1000, Grant <o...(a)grrr.id.au> wrote: On Mon, 05 Jul 2010 22:32:26 -0700, "JosephKK"<quiettechb...(a)yahoo... 7 Jul 2010 22:18

Shunt ? (was Re: Ideas for inexpensive True-RMS Metering?)
On 7 Jul., 09:20, Fred Bartoli <myname_with_a_dot_inbetw...(a)free.fr> wrote: John Larkin a crit :  > On Tue, 6 Jul 2010 19:06:37 -0500, "Tim Williams" > <tmoran...(a)charter.net> wrote:  >  >> "whit3rd" <whit...(a)gmail.com> wrote in messagenews:c6d94b54-aa3a-4eb1-8810-4417e6f366cd(a)32g2000vbi.googlegroups.co... 9 Jul 2010 23:49

Buy Designer Handbags
Compare n buy designer leather, plastic, paper and jute bags at low price, naaptol offers best deal to buy leather, plastic, paper and jute handbags at low price online in india Brands of Handbags Aaneri Aapno Rajasthan Ace Lifestyle Action Adidas Avon Cbazaar Delta Florists and many more visit: htt... 7 Jul 2010 07:57

Shunt ? (was Re: Ideas for inexpensive True-RMS Metering?)
John Larkin a �crit : On Tue, 6 Jul 2010 19:06:37 -0500, "Tim Williams" <tmoranwms(a)charter.net> wrote: "whit3rd" <whit3rd(a)gmail.com> wrote in message news:c6d94b54-aa3a-4eb1-8810-4417e6f366cd(a)32g2000vbi.googlegroups.com... The saturation of the core makes the coupling of primary and secon... 9 Jul 2010 09:26

NASA to Provide Missile Technology to Arabs...
NASA to Provide Missile Technology to Arabs... http://analog-innovations.com/SED/NASA_Kiss-up_to_Arabs_Bolden_Cairo__Egypt_06_15_2010.pdf ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. ... 9 Jul 2010 19:27

Switching Power Supplies - Low Output Voltages - Efficiency
In a step down converter, what is the mechanism that causes efficiency to be so poor when stepping down to low voltages? The typical case I'm dealing with is 12V in to 1V out at around 5A. Most canned buck converter designs quote high 80s to mid 90s efficiency when going from 12V to 3.3V, but change the output to 1... 9 Jul 2010 11:39

Metrology service
[forwarded from a conversation on a private list] I've had a hard time settling on the right set of parameters to support. Keep in mind, the framework has to support a variety of devices so tailoring the parameters to a particular device or device class is not acceptable. (the... 8 Jul 2010 12:31

Inductor DC current rateing peak current
I'm looking for a 390uH inductor for a Boost PFC choke 250W output power. After spending some time browsing data sheets,I'm confused why only the DC current rating is shown. There is never any graph for current vs inductance or inductance vs frequency or max peak current to avoid saturation or graphs for core ... 9 Jul 2010 20:33

Transient Behavior of Coupling capacitors
When coupling capacitors are used to remove DC offsets between stages, does there exist a dc component during startup? I notice that when I watch the dc after a coupling cap that it starts out with a large dc component which goes to zero. I assume this is because the cap is charging and eventually charges to th... 6 Jul 2010 07:52