A pen for a variable resistor - in half an hour. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Sometimes it is not possible to purchase plastic handles for variable resistors. I suggest using bottle caps for various drinks, household chemicals, etc. for these purposes. True, when trying to make the right handle, you have to solve two problems: how to fill the inside of the cap and how to get the resistor shaft right in the center of the cap the first time.
In radio stores you can find multi-colored hot melt adhesive in the form of rods about 30 cm long and 1 cm in diameter. This material will be a good filler.
The lid should be thoroughly rinsed in running water and dried. Using a compass and scissors, a circle is made of thick paper with a diameter equal to the inner diameter of the lid. In the middle of the circle, a hole is made of such a diameter as the resistor shaft. If the shaft is completely round, then a small cut is made on the emery machine, which will further prevent the handle from turning relative to the shaft.
The required amount is cut off from the hot melt adhesive bar. Using a moderately heated soldering iron, the hot melt adhesive is evenly distributed inside the lid. To reduce glue consumption and increase the rigidity of the future mass, it is advisable to add filler to the glue in a 1: 1 ratio. As a filler, for example, metal filings, wood dust, calcined river sand are suitable.
Having filled the lid with adhesive mass by 70 ... 90% of its volume, cover the mass with a paper circle. After two minutes, when the mass begins to solidify, put the handle on the resistor shaft. After about three minutes, the handle is carefully turned and see if there are any distortions. If necessary, the process of landing the handle on the shaft is repeated.
Within 15 minutes, the mass cools down to room temperature - the product is ready for use.
Author: A.Butov, village of Kurba, Yaroslavl region
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