Someone who knows Morse code or just going to study it, can build a simple device, shown in the figure. On a plywood Board install the battery B and the lamp L of the flashlight. Contactor In the manufacture of contact plate faulty relay. Now connect the parts to each other by wires. To increase the “range” of the Telegraph, put a lamp made from tin or heavy paper tube — a tube length of 20 cm.
Recommend to read
AFTER DRILL – needle files
Often, after the hole is drilled,further or a clean, slightly to expand or to make a slightly oval shape. This work can be facilitated steel Bender, automating it with a drill in a...
ORGANIZER-IMPROMPTU
Impromptu organizer can be made of several end-of-life electrochemical cells with a nominal voltage of 4.5 volts (battery type "3336"). They must be extracted from paper nests, which are...
