More about Alarm (115)

1-07-1987 | by R Kambach These circuits are intended for remote monitoring of the cur- rent consumption on the dom- estic mains line. The circuit in Fig...

1-07-1986 | The purpose of this one-chip circuit is to give an audible alarm in case a thief attempts to steal the car radio, which is generally conside...

1-07-1986 | 14 SS"ETALARM RIO TO BC557B T2 80539 C2 oon CI D9 C3 100n RI2 D•• ICE C. M80 100 V 16V pti 52 RESET ALARM 05 C8 I=1 mmi 1°:;: car burgl...

1-07-1986 | EE 84 July/August 1986 61car radio alarm 1 +12V +12V(DI • OV OV0 4,C(• It is an unfortunate as well as a gener- ally acknowledged fact t...

1-02-1986 | EE 62 February 1986 CAR BURGLAR ALARM Although no alarm offers complete protection against theft, it will, none the less, deter most thieves...

1-11-1985 | The alarm described has been in continual use for over a year at a temperature of around -18 ¬?C, which is, of course, quite normal for a de...

1-09-1985 | P Theunissen The alarm uses a minimum of two printed circuits: one for the control circuits, and the other for the interfaces. The latter ma...

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...

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

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