I like to take a bit mapped image of something and paste it into my drawing program. ?Then I use it as a guide to drawing the object. ?Now I have a vector image of it which can be scaled up indefinitely.
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i draw them in inkscape. they are simple symbols to make. if you use the same thickness of lines eveeywhere, then they look consistent.the other thing to do is to scrap them off arrl handbook'a pdfs.
