Electronic Stethoscope

Parts

Part
Total Qty.
Description
Substitutions
R1 1 10K 1/4W Resistor
R2 1 2.2K 1/4W Resistor
R4 1 47K 1/4W Resistor
R5, R6, R7 3 33K 1/4W Resistor
R8 1 56K 1/4W Resistor
R10 1 4.7K 1/4W Resistor
R11 1 2.2K to 10K Audio Taper Pot
R12 1 330K 1/4W Resistor
R13, R15, R16 3 1K 1/4W Resistor
R14 1 3.9 Ohm 1/4W Resistor
C1, C8 2 470uF 16V Electrolytic Capacitor
C2 1 4.7uF 16V Electrolytic Capacitor
C3, C4 2 0.047uF 50V Metalized Plastic Film Capacitor
C5 1 0.1uF 50V Ceramic Disc Capacitor
C6, C7 2 1000uF 16V Electrolytic Capacitor
U1 1 TL072 Low Noise Dual Op-Amp
U4 1 741 Op-Amp
U5 1 LM386 Audio Power Amp
MIC 1 Two Wire Electret Microphone
J1 1 1/8" Stereo Headphone Jack
Batt1, Batt2 2 9V Alkaline Battery
LED 1 Red/Green Dual Colour Two Wire LED
SW 1 DPST Switch
MISC 1 Stethoscope head or jar lid, rubber sleeve for microphone, board, wire, battery clips, knob for R11