Search results

  1. J

    Audioguru's Electronic Stethoscope Help

    Following that logic, if I shorted pins 1-8 the output would be the greatest? On a lark, I tried this.  The gain is ok but not great. Can you suggest a mod that could bump low volume signals significantly while clipping high volume signals such as when you bump the stethoscope against the...
  2. J

    Audioguru's Electronic Stethoscope Help

    When I pull the mic, I still get the crackle.  At first, there is no noise.  Then, after about 3 seconds, the crackle slowly starts back up.  When I pull the pot and/or U1, I get nothing whatsoever. When I assemble this for the final, I was probably gonna build it dead-bug style just to compact...
  3. J

    Home made pcb etchant?

    Yeah, I've used muriatic acid and hydrogen peroxide with very good results previously.  Check out: http://www.instructables.com/id/EFVWDTSLWYEV2Z8QB1/ for details.  You want to do this outside or in a well ventilated shed or garage.  Don't spill it as this is also nasty stuff that will eat a...
  4. J

    Audioguru's Electronic Stethoscope Help

    I had the chance to try your proposed fix last night.  Unfortunately, the addition of the cap only produced a crackly buzz and no other audio.  When I removed the cap, the quiet operation from before resumed. Any ideas?  (I hope I'm not doing something stupid here...) Thanks, Jessica
  5. J

    Audioguru's Electronic Stethoscope Help

    Hi folks, I'm a half deaf nursing student with a smidgen of electronics knowledge.  I just breadboarded Audioguru's Electronic Stethoscope project and am having a few problems with it.  I originally found the schematic here:     http://www.aaroncake.net/forum/topic.asp?TOPIC_ID=5923 My...
Top