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  1. U

    Electronic Stethoscope

    Thanks for the data sheet.             I was trying to get the transfer function so I can put it in my formal report for my class. I have an experimental bode plot that I measured, but the plot only tells me where the poles and zero are  located. UH3455
  2. U

    Electronic Stethoscope

    Hi all,             I have been working in the Electronic stethoscope 2. I would like to get the transfer function of this schematic, but I have not been able to get it. I get stuck at the non-inverting terminal of the LM386 power amp. Can any one tell how to solve from there? Thanks, UH3455
  3. U

    Electronic Stethoscope

    I'd like to understand the reasons for the changes made between the two circuits. Thanks.
  4. U

    Electronic Stethoscope

    Hey, Audioguru, I have some questions regarding the original electronic stethoscope design http://www.aaroncake.net/circuits/steth.htm and the second one that you improved it to http://www.electronics-lab.com/projects/science/019/ Why do you change the 741 op-amps to the LM386 op-amp and to...
  5. U

    Electronic Stethoscope

    We are building the first one, but we connected U5 to -9 [V] instead of ground, and we replaced the potentiometer with a fixed 2000 [Ohm] resistor value. It works, but only when we use speakers for the mic and phone jack. But, when we hook up the mic to it instead, it doesn't work. What isn't...
  6. U

    Electronic Stethoscope

    Hello all, I am new to this forum.  I am in a group doing this project for our electronics class.  Our question is, what values should we expect when we hook up the circuit to the power supply and measure output voltages and gains? We want to make sure we are doing it correctly to receive the...
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