Hi, Im not so new to electronics, but new to building from scratch. I repair mobile phone circuits for a living, and Im not sure if its a confidense issue, but have never really built a decent project, and this is 1 that I want to build. My girlfriend is pregnant and thought it would be good if I could pick up the babys heartbeat. But Im not sure if this would work so well for that, dont they use US to detect heartbeats if you go to the hospital. I would love to make this as a present for her. Any ideas if it would work, if it needs further amplification Im sure I can figure it out. Thanks, Philip