There are lots of reasons to build electronic and computer circuits; but only some of them involve building a circuit to keep forever. In many cases (such as building as a learning exercise, or just seeing if an idea works without any real application for it) you may just want to get it working and then tear it down and reuse the pieces for something new.

If you build your circuits by soldering all the components together, you expose the components concerned to quite a lot of heat and you will have to cut the component leads to size. Electronic components are not meant to stand up to repeated soldering; if you solder them ...

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