How to make an Air-Core Inductor (For images see view our photos ) Sometimes you may be unable to find a particular inductor the market. This is actually a problem faced by most of the electronic hobbyists and the problem becomes more serious if your project is RF related. So here is solution we have lets start The inductors required for RFcircuits(antenna,tuner, amplifier etc)arealmost impossible to find in the market and the only solution is nothing other than home-brewing them. With a little practice and patience you can construct almost all air cored inductors at home. The inductance of an air cored inductorcan be represented using the simplified formula shown below & to calculate the inductance of an air-core inductor, the same equation may be used. L = [d2n2] / [18d 40l] *Where’ L ‘ is the inductance in Micro Henries [µH] *‘d’ is the diameter of the coil from one wire centre to another wire centre. It should be specifies in inches. *‘l’ is the length of the coil specified in inches. *‘n’ is the number of turns. Notes *The length of the coil used in the inductor should be equal to or 0.4 times the diameter of the coil. *As shown in the equation, inductance of the air-core inductor varies as the square of the number of turns. Thus the value ‘l’ is multiplied four times if the value of ‘n’ is doubled. Thevalue of ‘l’ is multiplied by two if the value of ‘n’ is increased up to 40%. Winding the coil. *The coil must be first wounded on a plastic former of the adequate diameter (equal to the required core diameter). *The winding must be tight and adjacent turns must be as close as possible. *After the winding is complete, slowly withdraw the core without disturbing the coil. *Now apply a thin layer of epoxy over the coil surface for mechanical support. *Remove the insulation from the coil ends
Posted on: Sun, 25 Aug 2013 13:01:15 +0000
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