More about alarm (136)

1-07-1985 | elektor july/august 1985 A bicycle or tricycle should, as everyone knows, be fitted with front and rear lights. The noteworthy aspect of the...

1-07-1985 | elektor july/august 1985 Even the best car alarm is useless if you forget to set it upon leaving your car, whence this circuit. The relay ha...

1-06-1985 | infra-red movement detector elektor June 1985 The detector described in this article reacts to fast temperature variations caused by the mov...

1-11-1984 | burglar deterrent elektor november 1984 Every week the local papers carry tales of burglaries and break-ins, sometimes in our own street or...

1-07-1984 | 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...

1-07-1984 | . 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...

1-07-1984 | for alarm extension The "alarm extension" described in the September 1983 issue of Elektor, when used with a telephone cannot make a clear d...

1-07-1984 | 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...

1-09-1983 | alarm extension ... The garden party is in full swing .. . Amidst all the happy noises and chatter it is difficult to hear when the telephon...

1-07-1983 | 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...