More about ultrasonic (93)

1-10-1978 | There are many methods of I.. detecting the presence of a person within a specified area, for example by using ultrasonic or microwave Dopp...

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 | 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...

1-11-1977 | The title of this article should really be `remote-controlled poltergeist-imitator`. By operating a miniature ultrasonic transmitter con...

1-07-1977 | This simple ultrasonic (US) transmitter uses only one CMOS IC and a few discrete com- ponents, and will generate a short pul...

1-07-1977 | This simple ultrasonic (US) transmitter uses only one CMOS IC and a few discrete com- ponents, and will generate a short pul...

1-05-1977 | In November 1976 the circuit was described of an ultrasonic intruder alarm, the `Al bar`. By slightly mis-using the ultrasonic transduc...

1-04-1977 | The ultrasonic movement detector `Albar`, originally published in El 9 (November 1976), has proved a great success. Unfortun...

1-11-1976 | Al bar is an ultrasonic movement detector, based on the Doppler effect. It uses only one ultra- sonic transducer as both transmitter an...

1-11-1976 | Although designed as a warning horn for use . with the `Albar` ultrasonic alarm system de- scribed elsewhere in this issue, the...