are some statements of Murphy's Law (or attributed to him), especially applied to the field of electronics.
PROJECTS AND DESIGN
In a mathematical calculation , any errors that might leak, it will. And it's in the sense that more damage done in the calculation.
In any given calculation, the figure is obviously correct, is the root of the error.
manufacturers specifications on performance should be multiplied by a factor of 0.5.
In specifications, Murphy's Law Ohm's law void. ASSEMBLY
If a project requires n components, the availability will be "n-1."
Interchangeable parts will not.
Parties shall not unduly or be armed, they will be.
The most delicate component will be dropped.
a component selected at random from a group with a confidence of 99% belong to 1%.
The availability of a component is inversely proportional to its necessity.
to need a resistor (or capacitor) of a certain value, will not be found. Moreover, can not be achieved by any combination of serial or parallel.
All cable cut to size will be too short.
If cables can connect two or more different forms, the first of which is causing further damage.
The milliammeters be connected in parallel, and voltmeters in series with the power supply.
tested under conditions identical components not be identical in the final test, after the team was assembled.
A self-oscillating oscillator, it will not.
A crystal controlled oscillator oscillate at different frequencies, if it oscillates.
An amplifier circuit attenuate the input signal.
A PNP transistor is disclosed as NPN.
A safety circuit will destroy others.
If a circuit can not fail, it will .
A costly circuit protected by a fuse instantaneous protect the fuse, burning first.
REPAIRS
After removing the last of the 20 screws from the top, to check the fuse, you will find that the power cable was disconnected.
After placing the last of the 20 screws from the top, below the diagram, the fuse removed for review.
The probability that a particular component is causing the problem increases in proportion to the difficulty of replacing it and its price, and inversely to their availability.
If you can locate the damaged part, do not have tools to remove. When you get it out, the parts store will tell you they do not, but that is requested. When I finally get it, you'll discover that it was not damaged and did not need to change.
If a work has been done wrong, all you do to improve it only makes it worse.
The ease of locating a piece that has been dropped is directly proportional to its size and inversely to its importance for the completion of work.
A tool will always fall where it may do more damage. (Also known as "Law of Selective Gravity.")
If you must check one by one, a number of components in a circuit to locate the faulty, that would be the last of all, regardless of the order to perform the check.
If necessary, the manual will not be available.
If you have the service manual, not need.
If you get a copy of the diagram, the problem is in the part that was left blurred. GENERAL
In an instrument or device characterized by a certain amount of errors in more and less, the total error is the sum of each, combined in the same direction.
The likelihood of such error in a circuit is directly proportional to the harm it can cause.
In any given error, the fault can never be determined if more than one person has been involved.
When an error has been discovered and corrected, you will find that was well from the beginning. CONCLUSION
If something can go wrong, will! .... And will be at the wrong time.
If two things can go wrong, occur at the same time. Edsel Murphy
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