Widespread, cassette radio. Storage cassettes make a simple stand as shown in the figure.
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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,...
SO AS NOT TO SUFFER HANDS
To work with vibrating hand tools or tool is good to have a "antifibrogenic". To manufacture them is not difficult. Enough to the palms of the usual gloves to sew the strip or plate of...