I have the same relay on a breadboard and in a perf board and it
seems to be soldered together the same way. When it is in the
breadboard, the relay and diode on its coil works. If it works
in one situation and not the other then it is not wired in the
same way even though it "seems" to be. Otherwise physics falls
apart and that will never do. As you have the board only you can
find out what is wrong but it is wired up wrong in the circuit
that doesn't work. any other trouble shooting approaches? 1) Use
test equipment and be comfortable with what it is telling you.
2) Trace a signal from origin to the final component, where you
fail to find it your mistake is between there and the last good
point. 3) Never make a measurement without having an expectation
of what the answer should be. 4) Get an oscilloscope and learn
how to use it, electricity is invisible an oscilloscope is your
eyes. 5) When something simply can not be happening it isn't.
You are misinterpreting something. 6) Most important to learn -
all th