Recent content by D Ryan

  1. D

    Eletronic stethoscope but different intent!

    Thanks Hereo999 Again I hooked it up to the Fluke 116, this time to auto Loz, I got no reading at all but the LED would flash! So it has to be to fast for the read! Thanks again
  2. D

    Eletronic stethoscope but different intent!

    I tryrd it again, this time I used a min-max meter! 79.4 MV AC, Led light every time! I see what your saying! The circuit will recieve any signal and light the LED. Maybe some kind of sensativity can be added to it. Also noticed the harder I hit the earphone , the more voltage, and of course...
  3. D

    Eletronic stethoscope but different intent!

    From the circuit descritpion: U1b operates as a low-noise Sallen and Key, Butterworth low-pass-filter with a cutoff frequency of about 103Hz. R7 and R8 provide a gain of about 1.6 and allow the use of equal values for C3 and C4 but still producing a sharp Butterworth response. The rolloff rate...
  4. D

    Eletronic stethoscope but different intent!

    This is my first post! I am new to electronic's, I have a radio shack learning lab, only done a few things with that! Would this project be a good one for my learning lab? http://www.electronics-lab.com/projects/science/003/index.html Most of the threds I have read are member wanting to detect...
See more
Top