The circuit presented is to study Ultrasonic sensors and to analyze and improve the circuit and that this can be improved further.
The first stage consists of an amplifier for the ultrasound receiver, the output of this is entered into the second stage of amplification, the output of this second stage has two functions, to deliver the signal to be analyzed and to feed the transmitter ultrasound, since this transmitter is powered from the output of the receiver, we can say that ultrasound is a feedback, this is what to discard the use of oscillators and other circuits.
On the other hand the output of this second stage of amplification is sent to an AM detector, while the non-germanium diodes (can be improve), the circuit sends enough voltage level to be able to excite these diodes, and finally to the output of this detector is an amplifier with an LED to verify the circuit performance.
It is obvious that what develops in this way because it is an improved circuit and simplifiacrlo widely as possible, but could add operational amplifier as a comparator to be more stable output or schmitt trigger logic circuits simply to neutralize the chimes wrong.
The circuit is next, and append the link to youtube of it working.
Link to youtube http://www.youtube.com/watch?v=pGSvVraiot4
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