Discussions - sci.electronics.design

	Movement/Vibration Detection
	I am looking for a way to detect movement/vibration around a specific area, using some type of sensor(s) that are buried under the ground. I would like this sensor to activate an alarm when there is vibration around it - such as digging, or vehicles driving, etc. I have heard of sensors for house alarms that are buried in the ground... more » By ceebee - 1:11pm - 1 new of 1 message

	Piece of Wire Through a Toroid
	Here's a piece of straight wire through a ferrite toroid. Toroid ------ \| \| wire======================== \| \| ------ I recall seeing an experiment where a wire is poked through a sheet of paper, some current applied and iron fillings revealing a concentric... more » By D from BC - 12:48pm - 1 new of 1 message

	looking for HV power supply with decent current
	Looking to build, as simple as possible and cost effectively, a 100 KV power supply capable of supplying up to 5 mA current. I'd like it to be able to handle loads of all types, allow sparking ability, and be able to run free without connections. An old style induction coil comes to mind, but surely... more » By Chris Lobo - 2:51am - 12 new of 12 messages

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	For Slowman's Annoyance of the Day...
	For Slowman's Annoyance of the Day... [link] "Earth: It takes a licking and keeps on ticking" ...Jim Thompson By Jim Thompson - 1:41am - 13 new of 13 messages

802.11 Data Transmission

I want to send some remote data from a special 802.11 module to an apple Iphone. The distance is line of sight (from a model aircraft). How difficult do you think this would be? I am assuming it involves streaming of data. the data is only every 10 secs or so. I also want to do something for another application similar but with audio (full duplex... more »

By HardySpicer - Jan 7 - 15 new of 15 messages

	It's official...
	It's official... Obama selects fairy to head CIA... [link] [link] [link] It is rumored that his first job will be to prosecute anyone who had... more » By Jim Thompson - Jan 7 - 5 new of 5 messages

	Newbie on the Steinmetz Equation
	On the TSC Magnetics data sheet for material TSF-50ALL is this handy formula for ferrite core loss: Ploss = 0.08(f^1.39)(B^2.91) Also on the data sheet, there's a core loss graph at various frequencies. One data point is: @700Gauss @250khz Ploss = 100mW/cc Ok...I'd like to see if the graph and the eqn correlate..... more » By D from BC - Jan 7 - 17 new of 17 messages

	Garmin 760/750 GPS - audio through cradle?
	Is audio output from the Garmin available at the cradle connector(s)? Or only through the headphone jack? Thanks, By DaveC - Jan 7 - 1 new of 1 message

Quote of the Day

Quote of the day: "Whatever you give a woman, she will make greater. If you give her sperm, she'll give you a baby. If you give her a house, she'll give you a home. If you give her groceries, she'll give you a meal. If you give her a smile, she'll give you her heart. She multiplies and enlarges what is given to her. So, if you give her any crap, be ready... more »

By Jim Thompson - Jan 7 - 18 new of 18 messages