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I found "Transistor Circuit Design" by Laurence G. Cowles extremely helpful. There are numerous copies available on Amazon at very low cost. I did not find it on Prentice Hall web site so it may be out of print.

So are you trying to find out what the change in THICKNESS will be for this board over a temperature range? If so, your data indicates a thermal coefficient of expansion of 0.045 inches per inch per degree Celsius (assumed temperature scale as you didn't state), or 0.045 millimeters per...

Well since you asked, underling99, please stand corrected. In electrical engineering academia the direction of current flow is always that of positive carriers, even when the physical units are negatively charged elecrons. My professors always pointed out that it's strictly a matter of...

And some machines check the image on the coin too. To prevent using Canadian or Mexican coins for example. There are more tests but magnetism, size, and density are the most common. [upsidedown]

If the strips can be detected optically, I'd try using both a magnetic detector and an optical detector with their two outputs correlated. In other words, the optical section would tell you that there is a tape strip present, and the absence of output from the magnetic detector would tell you...

One additional input. If your RF frequency is high, you might make the last capactitor a dipped silver-mica type. They remain capacitive at very high frequencies, but the maximum C value is not very high. [upsidedown]

Or get the module from a junked BMW. They have this function on the dome light and the light on the mirror behind the sun visors. [upsidedown]

All of these techniques are pretty dependent on knowing what kind of delay we're measuring. Is that picoseconds or kilocenturies? And of course what kind of accuracy is required.[upsidedown]

And for a really simple, cheap-and-dirty approach that is surprisingly effective try this. Put the boards in a dishwasher and wash them with ordinary dishwashing soap. This will solvate many types of contaminants, but does not bring the issues that organic solvents do as others have pointed...

Yet another way is to shoot an ultrasonic wave down the container and measure the time delay for the reflected wave off the surface. As you can see from the replies, there are many ways to do this so more specific help would require more information about your application, specification, and...

Contact resistance is usually specified by the manufacturer for a mated pair of contacts. When I worked on automatic test equipment for torpedos, the military connectors used were specified as having a maximum resistance per mated pair of 3 milliohms, for example. The value is a function of...

Your request is a little confusing. Can I assume since you say you want to use a FET that you mean that you want a DC current source? And will you want to control the current source, or adjust/calibrate it, or just have a fixed-current source with the value determined by component tolerances...

In addition to experience, there's another parameter that makes a big difference. That is what used to be called "Drafting". I mean that the schematic can be made easier or harder to understand by the artistic presentation, or design of the schematic. It's a picture after all...

Excuse me for answering in inches instead of millimeters. I don't think that .037" drill and .055" OD on the via is large. Depending on the components you're using. I've used that drill size for the legs of through hole components for years. And as a rule the via OD wants to...

Rather than design your own solenoid, why not look at LVDT (linear variable differential transformer) approaches? You would buy the LVDT from a vendor and couple its movable core to the unit whose vibration you want to sense. When the core moves with respect to the solenoid winding an output...

And if you still want to do it yourself, I offer this suggestion: Why not create the brightness difference by pulsing the LEDs with differing frequencies for STOP and TAIL functions. As long as both frequencies are not too low, the human eye will never notice that they are not constantly on...

If cheap (inexpensive) is what you want, I agree that any-old-micro can do this. I'd look at the MSP430 or PIC12 family since they are under a dollar at quantity one. Assign one pin of the processor to drive the relay, one to input the frequency signal, and write a very short program to...

Please note that the MC14490 is now a product of ON Semiconductor. The Motorola web site thinks MC14490 is a serial to parallel converter. The debounce circuit sounds like a winner. I'm going to get the ON data sheet and look to use this part. Thanks for bringing it up.

You have not yet given enough information to make a clear choice of processor. For example, in the ADC and DAC circuits, how many bits of precision do you need? How many bits of accuracy? How many samples per second must each handle? Processor programming language? Estimated program size...

I've used compact flash as system component just as you are. And for many of the same reasons. We did have to write drivers for one use we made of it. In another place we had a Windows-like embedded OS to interface with it. Still needed drivers, but the vendor had already written and...