t_ang4 Posted October 4, 2003 Report Share Posted October 4, 2003 I am very interested to build the electronic stethoscope found in this website under 'Scientific'. However, I have quite a number of difficulties.1. Is the connection of the U2 correct? I mean I was not sure if there should be a feedback from the output of U2(pin 6). Since all the op-amp has its own feedback loop, why isn't there a feeback loop at the output of op amp U2.2. What is a Bi-color LED? I have bought it and it has 3 leads. How do I connect it ?3. How do I connect a phone jack? Could I connect it to the speaker or ear phone? How to connect them properly?Any help will be greatly appreciated. Thank you in advance.Project Link: http://www.electronics-lab.com/projects/science/014/ Quote Link to comment Share on other sites More sharing options...
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