Good day to all. Went looking for the formula for calculating the inductance of a=20 single-layer air-core inductor and stumbled across a page containing=20 several useful on-line calculators. I thought that I'd share the link. Site is The available tools are: 1. Electronics quick reference Resistor Color Code Capacitor Markings Inductor Color Code Standard Decade Resistance Values Simple Pi and Tee Configuration Attenuator Calculation Asymmetrical Attenuator Formulas 2. 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