Electronics Forum / Design / May 2009

Question the first: where to find transformer (or inductor) cores?
Mouser and Digikey don't sell them plain.  Who's the magnetic
equivalent of Digikey?
Other question: how to select cores?  Specifically, I'm looking for

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I have a water tank with with 2 x 5kW heating elements (on separate
supplies).
Problem is:  one is probably just about enough to supply all the hot
water I usually need, so how can I tell when one has failed?

I am looking to backlight a small LCD.  It is about watch size, about
0.5 square inches.  I would like to use an EL backlight because it
looks like they are more efficient then LED.  I am power my device
with a 3 volt CR1216.  This is about a 20maH battery.  There is not

These crappy RatShack terminal posts are actually conductive!
http://www.radioshack.com/product/index.jsp?productId=2103639
A pair of them leak 12 pA to the chassis at +1 volt. If I ground
myself and hold the plastic screw part of one, it goes up to 20.

It wasn't Tesla, though he was the first to engineer a complete ac
power distribution system including 3 phase.
I think it was Faraday?
Hardy

Hi there, I'd appreciate some comments on the following....
I want to compare the phase of two signals of the same frequency,
frequency = 3 mhz.
Let's say I use a flip flop (HC series). Signal A is applied to the

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I looking at having to protect an 24VDC output from overload/short
circuit. I have a design that works with a sense resistor which trips
a comparator to turn off a MOSFET, but I would like to find a method
to avoid too many parts and complexity.

I'm looking for a dual (quad) monostable retriggerable multivirbrators
with minimal components count.
I need:
* +5V single power supply

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I shound measure charge battery with a microcontroller, but i have no
idea how can i do it...any link,book, data-sheet, suggestion?
Thanks

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