There are numerous ways to make current, to the ball of yarn did not run away and not out somewhere. The easiest is to put it in a box, basket, or, as shown in the drawing, just the right size jar.
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SIREN FOR MODEL
The device is useful for a model fire truck and a guard system. The intervals between the signals and their duration is controlled by changing values of electrolytic capacitors C1, C3,...
FROM ANY ANGLE
Many questions arise in the manufacture of superstructures of ships models. One of them was how exactly to bend the plastic sheet to the specified angle. Gluing the individual sheets...
