Do not you find that a bunch of keys in your pocket slizhkom became cumbersome? Solder them in pairs, and it will be much more compact and easier to use. The keys are connected to a pair of depending on the length and destination. Possible combinations can be the key to the apartment and from the mailbox; the key of the garden gate, and to give the key to the garage and from the castle at the gate.
Recommend to read
IMPROVED PROBE
Primitive "control print" — electroputere with two wires and the lamp — not the best device for "continuity" of electric circuits. Commercially available testers and isometry is also...
VOLTAGE CONVERTER FOR MS
Designing electronic devices on integrated circuits, radio Amateurs often use to display the information indicators IN gas-1 — IN-16. They usually feed from the mains AC voltage of 220 V...
