You need to carefully pour a viscous liquid (e.g. oil paint) from banks in a narrow-necked container or to fill in the gaps with the heated tar or mastic? Here you will rescue this type of nozzle, made of half cap from the same banks, tightly inserted in holes on the tube spout.
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In Amateur radio practice, there are situations when 9-volt DC source you need to obtain 12, and then a higher output voltage. Bail in such cases can I designed a compact transformerless...
