More about ultrasonic (93)

1-09-1987 | EE 34 September 1987 would be displayed by the dis- play units. The transmitted power levels would set a more stringent limit on large dista...

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...

1-11-1983 | ultrasonic/infrared barrier elektor november 1983 Infrared barriers are used in counters, alarm equipment, automatic door- openers, remote c...

1-10-1982 | 10-24 — elektor october 1982 ultrasonic distance meter Measuring distances is not difficult, especially when the right equipment is availa...

1-07-1981 | Nom two unused inverters inside the 4069 package) to CMOS ultrasonic receiver Remote control of all sorts of equipment is be- coming more an...

1-10-1980 | 10-24 — elektor october 1980 remote control slide projector remote control slide projee ultrasonic projector control The following equatio...

1-07-1980 | 7-04 elektor july/august 1980 r - • see text L R3 R12 15V 811 P2 0 _15V R2 Remember the old-fashioned copper bell-on-a-chain? In many ways...

1-06-1980 | 6-18 — elektor june 1980 timbug II Rather like a bat, the bug transmits a "radar beam" of ultrasonic sound which will be reflected by any...

1-07-1979 | When considering constructing a `wireless` headphones system, three basic approaches present themselves: a `genuine` r.f. transmitter and re...

1-07-1979 | Before going on to describe the circuit of the receiver, there is one point worth noting. Although primarily intended for use in an ultrason...