This is easiest way to create an electronic stethescope

Step 1: Components List

1. 1 x BC547

2. 1 x LM7805 voltage regulator

3. 1 x LM386

4. 2 x .1uf ceramic capacitor (104)

5 1 x 100uf 25v electrolytic capacitor

6 1 x 1000uf 25v electrolytic capacitor

7 1 x 10uf 25v electrolytic capacitor

8 2 x 470K resistor

9 1 x 3.9 ohm resistor

10 2 x 1k resistor

11 1 x 3.5mm Headphone jack

12 1 x 8 pin IC socket

Step 2: Circuit Diagram

Step 3: Transducer

piezo transducer I used here is found from a bike indicator buzzer... open it up an u can find a disc shaped buzzer as shown in the picture. we just need the red and yellow wire, where red is positive and yellow is negative. green is feedback but we don't use that wire just clip it off