On Sun, 07 Sep 2008 04:09:24 GMT, Yukio YANO <y...@shaw.ca> wrote:
>WJW wrote:
>> Hello...a quick question looking for a good suggestion/solution/answer,

>> 1) I have a small rural nursing school;
>> 2) I have a $500 electronic stethoscope (micro-battery powered) that can
>> hear/play/record sounds using an I-Pod by using a direct wire/plug into
>> the I-Pod external microphone jack;
>> 3) I-Pod sounds are very weak and you have to be within inches to hear
>> the sound during playback;
>> 4) I need a room full of 10 students to hear the sounds from the
>> stethoscope;
>> 5) I connected it to a wall-plug store-bought powered I-Pod speaker
>> sound system and it worked great...everybody in room could hear the
>> sounds fine!;
>> 6) Was then informed it could possibly be a major shock hazard (110
>> power from wall through speakers to stethoscope to person wearing (ear
>> pieces) and to patient's chest (diaphragm);
>> 7) So...now I'm back to Step 1 & 2...

>> Any suggestions on how I could truly prevent a surge danger for under
>> $100 bucks so that I can safely use the stethoscope and the powered
>> speaker system? Would an automotive quick-jump power pack with 110
>> inverter work or would the danger still be present?  Is there really
>> even a danger in the first place?

>> Thank you very much for your wisdom, advice and expertise!

>> William in Colorado

>Just isolate the patient electro-mechanically from the stethoscope by
>placing the probe in a Plastic Baggie.  The probe is most likely Plastic
>or Bakelite with a plastic  or rubber hose anyway, A thin layer of
>plastic sheeting will not affect the acoustics !

>Yukio YANO