What if you need to draw a circle, and a compass at hand is not! To get out of this situation by making a simple compass of the bent and strapped to the pencil in the right place for a stylus pen, as shown in the figure.
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SAFE POWER SUPPLY
The inclusion of transformers on 400 Hz network, 220 V(50 Hz) using a ballast capacitor. If you look at the merits in diversity of industrial and self-made Amateur radio power supplies,...
T-28 “Trojan”
Training aircraft, T-28 "Trojan" developed by "North American" replacement for the T-6 "Texan". The first flight of its prototype HT-28 was held on 26 September 1949: in mass production...
