More about Security (156)

1-07-1997 | The Stamp Security System is suitable for the home, a small office or a shop. The heart of the system is the BASIC Stamp microcontroll...

1-01-1996 | This circuit allows the proper functioning of different elements of a fuel burning central heating (CH) system to be monitored. An alphanume...

1-04-1990 | The TEA5500 from PhiJips is a coder/decoder circuit for security systems. The TEA5500 is housed in a 16-lead DlL case (SOT38) and the TEA...

1-12-1986 | L1 mm COMMUNICATIONS The problem of unauthor- ized access to information in transit is as old as mankind itself. Each ad- vance in the mean...

1-07-1980 | 7-38 elektor july/august 1980 Living in a temperate climate involves having to cycle with lights on every now and again. The trouble is that...

1-01-1976 | Low-cost domestic burglar alarms often operate on the loop principle. A number of normally closed microswitches protect points of ent...