Ultrasonic motion sensor project

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exx

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I’m having a problem with my ultrasonic motion detector project. It seems only to detect sharp noises. I got the circuit from Kitsrus.com website. The only changes i made where the BC639 for a BC547 and the 1M Pot for a 500K variable resistor in series with 470K. So… hoping you could help me out.
 
I m actually using the BC547 right now, but i'm still getting the same result. i 'm using a 555 timer to generate my 40KHz signal instead of the 40Khz crystal oscillator, can that be the problem.
 
exx said:
I m actually using the BC547 right now, but i'm still getting the same result. i 'm using a 555 timer to generate my 40KHz signal instead of the 40Khz crystal oscillator, can that be the problem.
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hi,
The text for the project does state that the crystal will give better sensitivity.
The 555 derived 40kHz may not be stable enough.
 
Which kit number? Kit #20 shows the schematic and parts list for an ultrasonic receiver but does not show the transmitter.
 
Last edited:
audioguru said:
Which kit number? Kit #20 shows the schematic and parts list for an ultrasonic receiver but does not show the transmitter.
Click to expand...

Kit #49. I left out something important 2. i m using a 400ET/R180 instead of 400ST/R160 as in the circuit
 
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