In our self-similar groups the foam — some of the most popular materials. One day we read in the “M-K” (No. 9, 1977) about the different ways of processing foam. We liked most of the foam cutting hot wire. We did a few of their stanochki and accessories and we offer readers “M-K” is one of them. It’s called “Electrothermal Board cutter”. All the details of it mounted on a wooden U-shaped panel assembled and glued plywood 12 mm. Cutting tool is nichrome wire thickness of about 0.5 mm, sandwiched by two M8 bolts, drilled through by a drill bit Ø 2 mm. Supported by her taut arc spring strip steel with a thickness of about 2 mm, privernuty to the panel with two screws M8.
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Because of the deterioration of the old Velocimetry often have to fix. The new find does not always succeed there, but another size of industry and trade not able to keep up with “different-sized” Bicycle wheels in the population. However, if you learn how to lengthen or shorten the rubber tube on your bikes and scooters kids are always on the go.
Aquarists usually determine the turbidity of the water in the aquarium, visual manner (“eye”), and beginners don’t change it until then, until it is radiating the smell. However, with the help of an electronic device, which is easy to collect a couple of free evenings, you can control the suitability of water in the tank for future use, with high precision, eliminating the notorious “human factor”. Will benefit from this approach all people and their Pets in the aquarium.
This RC model of figure procopiu course is a small fishing seiner (MPC) Murena with a displacement of about 20 tons, with a length of 13 m and a width of 4,7 m. the Ship with the hull lines of the “Grand banks”, built in the style of the tug, equipped with an engine power of about 150 HP, which allows the MPC to reach the speed of 10 knots. The model of a small fishing seiner not very difficult to manufacture, and it can be recommended to build for beginners “radio operators”.
In the Arsenal of the Amateur radio voltmeter almost the most important measuring device. But the trouble is that to produce and it is not always possible. And not because the scheme is complicated. For many, the stumbling block is the arrow microammeter. However, at first it can be replaced by electron-optical indicator 6Е5С (6Е1П) or neon lamp. But first you need a high anodic voltage (up to 300V), and the second measures relicina capacity below 55 V.
If you doubt the validity of a diode, transistor or want to determine their conductivity type, use one of the devices with which we introduce you in this article. The advantage of the devices is simplicity: they can even build a new ham. The basic design is based on schematics from the Bulgarian journal “Radio television electronics”.
