It is not difficult to make a capacitor of constant capacity. To do this, you need a stanoleil foil (tin paper), waxed paper and pieces of tin. You can take stanola foil from wrappers of chocolates or chocolate, and you can make waxed paper yourself.
To do this, take thin tissue paper and cut it into strips of 50 mm wide and 200-300 mm long.
The strips are immersed for 2-3 minutes in molten paraffin (not boiling). As soon as they are removed, the paraffin immediately freezes. After that, it must be carefully scraped off with the blunt side of the knife so as not to tear the paper. Waxed sheets are obtained.
Fig. 111. Home-made capacitor of constant capacitance.
For the capacitor, the waxed paper is folded with the letter “I”, as shown in Figure 111, in the spaces on the one and the other side of the “accordion”, insert stanilev sheets of size 45X30 mm.
When all the sheets are inserted, the accordion is folded and ironed with a heated iron. Remaining from the outside, the staniol ends are interconnected.
It is better to do it this way: two plates are cut out of thick cardboard, put “accordions” on both sides and clamped with two clips made of tin or brass. To the cores, you need to solder the conductors, with which the capacitor is soldered during installation.
With ten stanyole leaflets, the capacitance of the capacitor will be approximately equal to 1,000 pF.
If the number of leaves is doubled, the capacitance of the capacitor will also increase approximately twice.
In this way, you can make capacitors with a capacity of from 100 to 5 tons pf.
High-capacity capacitors from 5 tf to 0.2 microfarads are made somewhat differently. An old paper microfarad capacitor is required to make them.
A paper capacitor is a roll rolled up of a tape consisting of two strips of waxed paper and two strips of stanoliol foil laid between them.
In order to determine the length of the strip that we need for the capacitor, use the formula:
In this formula, C is the capacitance of the capacitor we need in pF, and is the width of the strip of stanoliol foil in cm, l is the length of the strip of foil in cm, For example, to obtain a capacitor with a capacity of 10 tp with a strip width of 4 cm, the required strip length will be equal to:
l = 0.014 ----------- = 35 cm.
A capacitor is made as follows, from a roll of a microfarad capacitor, a tape of the length we need is unwound (all four bands). To prevent the capacitor plates from interconnecting, at the beginning and at the end of the tape, the stanileol foil is cut 10 mm more than the paper.
Fig. 112 Home-made capacitor of large capacity.
Before folding the tape, a conclusion is made from each strip of foil with a thin stranded wire or tinned copper foil. The output from one cover is placed at the beginning of the tape, and from the other - at the end and in the opposite direction. Then the tape is rolled into a tube and glued with thick paper on top. Pasting paper is taken 10 mm wider than the tape. At the protruding edges of the paper, two rigid mounting conductors are embedded.
The wires from the capacitor plates are soldered to these conductors from the inside of the paper sleeve, as shown in the figure.
How to make a capacitor
A capacitor is an elementary electric element containing an electric charge. It is almost like a battery. Capacitor may be different. It is used as an element for building electrical circuits. Making a capacitor is very simple. It consists of a terminal with positive and negative charge, which are separated by insulating material. One of the simplest capacitors is made from salt water - an electrolytic capacitor. We will tell you how to make it.
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An inventor lives in the soul of each of us, and therefore amateur radio is a fairly popular hobby. Independent manufacture of radio components is one of the most interesting components of this hobby. In this article, we will talk about how to make a capacitor with your own hands at home.
To make a capacitor, we need:
The foil does not need additional preparation, but with the help of the last three components we have to make waxed paper.
So, the materials are prepared, get to work:
- We heat the paraffin and carefully process the papyrus paper.
- We put it in the "accordion", the width of each section of which is about 30 mm. The number of accordion layers determines the capacitance of the capacitor; each layer corresponds to approximately 100 pF.
- In each section we put a piece of foil with an area of 30 by 45 mm.
- We fold the accordion and iron it with a warm iron.
- Everything, the capacitor is ready! Pieces of foil looking outward are the connecting contacts of our capacitor through which it can be connected to the circuit.
We got the simplest household capacitor, while it is worth noting that the thicker and better the foil, the more high-voltage it will be. However, we draw your attention to making a capacitor at home with your own hands that can withstand more than 50 kV, it is better not to try. Amateur Professionals advise you to use this option as a dielectric if you want to get close to this value, but you will need a laminator to heat them.