
Old saw blade for metal can still be of use if, instead ground off the teeth to make a sanding disc edge. This painting, like a plane, it is convenient to process parts made of wood and foam.
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THE TIMER CONTROLS THE SOUND
The device, whose scheme is published in the journal "Popular electronics" (USA), produces a positive pulse when a sound (for example, firing of the gun) reaches the microphone B1 (see...