| This circuit allows the proper functioning of different elements of a fuel burning central heating (CH) system to be monitored. An alphanume...
More about Security (144)
| 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...
| 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...
| 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...