To make myself a mini-tractor (MT) is a dream of many. But they sometimes stop because of the difficulties in acquiring scarce nowadays powertrains, gearboxes with the right gear ratio, differential gear and other parts. Other (basic this beginners homebrew) deterred by the complexity of intricate drawings and manufacturing technology design. A longtime subscriber of our magazine, the author of a number of original designs of small tools V. Boldyshev offers not to despair and peculiar to each natural nous braver to do things. How! Technology, which sometimes intuitively come to many of the homebrew, collecting in a single structure existing units and details “at the place of installation”, doing virtually no daunting drawings. A “deficit” around, taking advantage of opportunities Vtorchermet… or lowly of the landfill, which sometimes careless business executives charged fuses good.
Fast and simple — to manufacture heat sinks for transistors and microcircuits made of copper or aluminum foil with a thickness of 0.1—0.3 mm. Plates are cut with scissors, carefully collected in a package with a thickness of 3 mm, clamped between two fairly tough boards and drill holes. Prior to Assembly of the plate trimmed in the area of thermal contact and smooth out the micron sandpaper to ensure their tight fit. And after the plates are assembled, their ends are bred throughout the free zone.
As a stand-alone power source flash FIL-46 I use a voltage Converter PN-70, manufactured by Kharkiv enterprises “ECHO”. In the process of operation of this device revealed its drawback: after charging the storage capacitor and ignition indicator lights, signaling willingness to work consumed by the inverter current decreases from 1.5 A to About 1 A, that is, the batteries are not disabled and continue to discharge. This leads to rapid failure. To stop the discharge of the batteries is possible by disabling the flash from the unit manually by taking out the plug from the socket or set forth in the chain of socket switch. However, both methods are inconvenient due to the fact that distract from the shooting.
In the December issue of “M-K” for 1990 were published material about the switch-gubbare. There is proposed a technical solution I liked, but… think about it, has developed its own version. In order to turn on the light of the two points, sometimes enough to modify the normal switch. It is necessary to disassemble and install a third contact plate. This is done quite simply.
