From
http://engr-www.unl.edu/ee/eeshop/proto.html
"Nobody does electronics work for long without running into the classic white
plastic prototyping breadboard, made famous by Global. These are the de facto
standard for whipping up a circuit just to see if it works. They do a good
job of this and I don't know what I'd do without them, but remember that
they have limitations.
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Breadboard connections are not as good as wire-wrapped or soldered connections.
If you are doing designs with high frequencies or high currents (anything
above 100 mA) these connections may not be reliable.
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Breadboards tend to wear out with use, especially if you've tried to jam
some fat resistor wires into the holes. This makes the connections even less
reliable or may make some holes unusable. If you are having problems with
your circuit, use an ohmmeter to make sure there really is continuity where
you think there is.
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Breadboards don't always let you supply power reliably with the power buss
along their edges. Make sure you use despiking capacitors on all your chips
on the breadboard. "
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