| burglar deterrent elektor november 1984 Every week the local papers carry tales of burglaries and break-ins, sometimes in our own street or...
More about Alarm (115)
| alarm extension ... The garden party is in full swing .. . Amidst all the happy noises and chatter it is difficult to hear when the telephon...
| for home and garden A periodic alarm signal has many ap- plications in daily day life: "lights off" indicator in cars, water level in- dicat...
| july/august 1984 00" A . . . protects tomorrow"s dinner As we all know, it is important that doors of fridges and freezers are nor- mally cl...
| . for sleepy drivers radio can be switched on and off via a relay contact. Switch on the supply; the display should then flash. Setting the...
| for alarm extension The "alarm extension" described in the September 1983 issue of Elektor, when used with a telephone cannot make a clear d...
| stag awake alarm Do you turn over in the morning and then often oversleep? This circuit could prevent you being late for werk, but it can al...
| 7-36 — elektor july/august 1982 Most alarm systems can be divided into two main categories. They are normally activated by closing, or int...
| r alarm elektor June 1982 — 6-47 Electronics are finding their way into the car more and more these days. This is not confined to the up-m...
| R. Rastetter auto theft alarm Readers who are in the habit of parking their cars close to lampposts at night may presume that the vehicle is...