CMOS ultrasonic receiver

Nom two unused inverters inside the 4069 package) to CMOS ultrasonic receiver Remote control of all sorts of equipment is be- coming more and more popular both inside and The transmitter can be either a outside the home. source of light or of sound and the receiver is usually built-in to the equipment which it is in- tended to control. More often than not, the receiver will only react to the relevant transmitted (coded) control signals and is therefore rather sophisticated. This is not the place to discuss whether infra-red or ultrasonic remote control is more or less suitable is very low. This can be useful where it is necessary to isolate the remotely controlled equipment from the mains. The recommended transducers for the circuit are the SE 048-25 T/R (25 kHz) or the SE 048-40 T/R are (40 kHz) from Toko. If other transducersinput employed, it may be necessary to modify the stage to the field effect transistor Ti This transistor e receiver. The is used here as a preamplifier for...