The simplest “neprolivajku” for the paint or varnish can be done EA literally two minutes, if you drive in a Board cut two nails and pull them rubber ring cut from a Bicycle or a car camera.
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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,...
COUNTERSINK OF DRILL
Easy to master work of a hand drill. Sometimes does not calculate SIPU and broke in half, still quite new drill. Of course, if broke off, not the whole working part, it can still be...
