i gt a question with ultrasonic radar

[dummy55555]

UltraSonic Radar

hi,,since this used as a detector but why is the both tranducer pointing at one side. but not pointing each other. it has a transmitter and receiver, right,,
anyone can please answer me..???

ermm.. i still have another question, the TR3 in the circuit did not show me which side is the emmiter. can anyone tell me..
thanks a lot...

 

[Nigel Goodwin]

UltraSonic Radar

hi,,since this used as a detector but why is the both tranducer pointing at one side. but not pointing each other. it has a transmitter and receiver, right,,
anyone can please answer me..???

Because that's how 'radar' works, it bounces a signal off the object.

ermm.. i still have another question, the TR3 in the circuit did not show me which side is the emmiter. can anyone tell me..
thanks a lot...

It's at the bottom, but (as usual for that site) the circuit is not only of very poor quality, it's not even drawn correctly (obvious mistake, C1).

 

[audioguru]

The kit and project are not sonar (radar). It is a horrible translation.
It is a motion detector project.

The circuit detects the amplitude of nothing or of the reflection of the ultrasonic transmission that is received then it amplifies the AC caused by motion.

 

[WBC student..]

Wbc

im just wondering where the number *9 is going to connect...?? why it has only one output instead of 2..?