If you want to transfer a set of tools to the job site or just keep them at the ready is essential for this will be an easy plastic tray. These are found in hardware stores, but can be manufactured with your own hands: for example, of halved plastic canisters. The tray will be even more convenient if to it to attach the handle of a thin metal tubes.
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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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After working with epoxy, always remains a small quantity of it, which can be used for the manufacture of arms to the small tool, such as needle files. To put on them a big "drop" to...
