Electronic stethoscope

hey i dnt knw abt electronics stethoscope hw it works? cn any 1 tel me?

pls send me on my email <snip> i want brief discription

Moderator's note: Please keep all questions and answers n the public forums.

Welcome to the forums.

Google seems to know a lot. Here's one old design by a member - http://www.aaroncake.net/circuits/steth.asp

Good enough to find a place where to use the OLD and LOUSY 741!!

You've been hanging around AudioGuru too much.

You can find a much better op amp in the form of a TL082 from Radio Shack. Just ground the unused inputs.

atferrari said:

Good enough to find a place where to use the OLD and LOUSY 741!!

Click to expand...

I used the lousy old 741 opamp to blink the LED.
I used a TL072 dual low noise audio opamp as the preamp and lowpass filter. An LM386 power amp IC drives the headphones.

Audioguru said:

I used the lousy old 741 opamp to blink the LED.
I used a TL072 dual low noise audio opamp as the preamp and lowpass filter. An LM386 power amp IC drives the headphones.

Click to expand...

Hey the 741 still has uses... I use them to prop up my bookshelf!



(In all seriousness, it's a very common op-amp in education, though I'm glade we're now taught using a TL082 which is closer to an ideal op-amp, but still a long way off.)

hey i want brief description pls give me i m using 741 op amp

jayshree31 said:

hey i want brief description pls give me i m using 741 op amp

Click to expand...

What do you want a description of?
What are you using an old 741 opamp to do?

The Electronic Stethoscope project has a description of its circuit at www.aaroncake.net and at www.electronics-lab.com .
I used a dual low noise audio opamp a TL072 for the preamp and lowpass filter IC, an LM386 for the power amp and a 741 to flash the LEDs.