The simplest variable capacitor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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The manufacture of this simple home-made variable capacitor was described in the News Radio newspaper for 1927, No. 5. This capacitor is especially well suited for use on the VHF bands.
This capacitor is mounted in a small box and consists of two copper or brass plates. One of them - "P" - is motionless and fixed on a wooden base of the box; it connects to the left terminal, brought out in the side wall. The plate is covered with a thin strip of mica or "D" celluloid. Above the fixed lining is placed a movable one - "N", reinforced on one side only and connected to the right terminal.
This plate is made of brass, 0,8-0,9 mm thick. Its dimensions should be somewhat smaller than the dimensions of the fixed plate. To give it flexibility, the plate is stuffed for 10 minutes with a wooden hammer, after which it begins to spring. It is fixed at a certain angle to the fixed lining and can approach it by screwing in a pressure screw placed in the lid of the box. When the plates are removed, the capacitance of the capacitor is the smallest, when compressed - the maximum.
The dimensions of the plates are selected depending on the desired maximum capacity according to the usual formula for calculating the capacity.
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