Design

Cheap potting alternative
Is it possible to use epoxy or polyester surfboard resin for potting audio fequency PCB's? How about the crystal epoxy used for encapsulating insects, etc? Any other low cost alternatives, aside from flexible rubber/silicone? Many thanks, Larry Kent ... 8 Mar 2010 20:56

Square + triangle = sine (almost)
If a squarewave contains all odd harmonics of the fundamental frequency, and a triangle all even, will I get ALL harmonics if I mix the two waveforms? It looks like a cross between a squarewave and sinewave. I have not seen any tech references to the practical value of this. Does it have any? For example, ... 12 Mar 2010 10:32

Avalanche Photodetector
Avalanche Photodetector, IBM, germanium, 1.5V, 40Gbps: http://domino.research.ibm.com/comm/research_projects.nsf/pages/photonics.apd.html ... 8 Mar 2010 16:25

Energy harvesting
Hello, let's say I want to light a led (steady, not flashing) of some hundred mW. I'd like to use a magnetic energy harvesting method, for example the classical strong magnet into a coil (suggestion about other e. harvesting method are welcome; no thermal or solar, though). Given the following condition (es... 9 Mar 2010 04:33

Cruise ship stuck in ice
That damn global warming! Several ships, including one small cruise liner, were stuck in ice.... More than 30 ships were plagued by the problem and stranded at sea until the ice was cut away early today, March 5, 2010. http://www.examiner.com/x-20221-Long-Island-International-Travel-Examiner~y2010m3d5-cruise-sh... 8 Mar 2010 17:33

Basic Stamp
I have posted several threads about converting 24Hz pulses to 60Hz basically a 5/2 ratio. I tried a phase locked loop, it sorta works, but my chip count is getting high, and I am thinking about making more of these and selling them if I can write a computer program to resolve wave sound files. Therefore, since ... 10 Mar 2010 09:41

Capacitor Wizard (ESR Tester) Meter Movement
I got this part: http://shop.midwestdevices.com/product.sc?productId=3&categoryId=1 when I really should have been looking for this complete assembly: http://midwestdevices.com/Brochure_Blowup.html The movement is a 1ma FS 50 ohm device. Can I build a complete do-it-yourself ESR tester from this meter ... 5 Mar 2010 23:59

Generating a spherical EM field
What type of coil geometry would be required to create (or best approximate) a contained, 1 metre diameter, spherical EM field of several millgauss? Thanks for any suggestions. Ken Weston ... 5 Mar 2010 21:49

SPDIF to AES/EBU
Looking for a reliable circuit for the level conversion from SPDIF to TTL. I then intend to feed it to an RS485 driver and into a transformer for transmission via CAT5e -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.theconsensus.org/ - A UK political party http://www.blogtalkradio.c... 6 Mar 2010 21:45

dieresis
On 3/1/2010 4:58 PM, D Yuniskis wrote: Hi, I do a lot of formal writing (specifications, manuals, etc.). And, I suspect much of my spelling, vocabulary, grammar, etc. traits have remained largely unchanged since grade school. :< Today, as I was trying to remember a keystroke sequence for a... 12 Mar 2010 18:27