More about alarm (134)

1-07-1978 | Most ultrasonic transducers can be operated at input levels up to 50 ... 80 V peak-to-peak. This usually means employing an ultra-sonic osci...

1-07-1978 | Various microprocessor circuits place particular requirements upon the duration of certain control signals. If these signals are generated b...

1-07-1978 | There are a number of applications, such as the analyser filters in a real-time audio spectrum analyser, which require bandpass filters that...

1-07-1977 | Because of their low cost, high input resist- ance, good noise immunity and wide supply voltage range CMOS logic circuits `lend t...

1-07-1977 | Depending on type and the current flowing, • the forward voltage drop of an LED may lie between 1.4 and 2 volts. The temperatur...

1-07-1977 | This circuit is designed to give an audible and visible warning to the absent-minded motorist who forgets to switch off...

1-07-1977 | Wherever there is a mass market for a complex digital circuit, an LSI chip is sure to appear. It should not come as a...

1-12-1976 | Although most readers of technical magazines will have had a surfeit of digital clocks by now, we feel that the design given here...

1-12-1976 | In most large towns and cities (for that matter, in many small ones as well!), the parking meter is a very familiar sight. Install...

1-11-1976 | This unit will sound the alarm if the door of a refrigerator is left open too long. Very few components are required for this effective...