Though served the old speaker, and his ring magnet is still strong. Use it for hanging tools. Hold it firmly on any metal surface, for example, repaired the machine, so that the necessary hand tools will be always at hand and small fasteners do not get lost in the grass. Under full wooden Cabinet, rack it is possible to strengthen the steel disk privernuty screws.
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The proposed German magazine "Funkamateur" light relay is activated when light falls on the photoresistor R1 (see diagram) — when this occurs, a loud siren sound. Transistors VT1, VT2...
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