This is an endlessly useful pair of apps for those of us who work in electronics. Here is the website These Apps are one of those apps that when you check it has what you were looking for, even if you, at first were not sure. The section on the Raspberry Pi was a big help when I got my first one. The Pro version is a one time payment of $6.99 I would gladly pay more it is that good.
Electronic Toolbox and RF-Toolbox - Electronic Toolbox
electronic-toolbox.com
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