Tutorial Reference # 136
Title: Electronic Stethoscope
Language: Electronics
Description: No description needed...
Author: devilson
Added: July 29, 2007, 9:53 pm
Rating: Not rated
# MIC1 is an assembly made out of a stethoscope head and electret mic. Cut the head off the stethoscope and use a small piece of rubber tube to join the nipple on the head to the mic.
# Be careful with the volume, as excess noise levels may damage your ears.
# The + and - 9V may be supplied by two 9V batteries wired in series and tapped at the junction.
# R11 is the volume control.
R1 1 10K 1/4W Resistor
R2, R3, R9 3 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 2.5K Pot
R12 1 330K 1/4W Resistor
R13 1 1K 1/4W Resistor
R14 1 3.9 Ohm 1/4W Resistor
C1 1 470uF Electrolytic Capacitor
C2, C3, C4 3 0.047uF Capacitor
C5 1 0.1uF Capacitor
C6 1 1000uF Electrolytic Capacitor
D1 1 Bi-Colour LED
U1, U2, U3, U4, U5 5 741 Op-Amp
MIC1 1 Electret Mic
J1 1 1/4" Phone Jack
MISC 1 Board, Wire, Sockets for ICs, Knob for pot, Stethoscope, Rubber tube
Language: Electronics
Description: No description needed...
Author: devilson
Added: July 29, 2007, 9:53 pm
Rating: Not rated
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# MIC1 is an assembly made out of a stethoscope head and electret mic. Cut the head off the stethoscope and use a small piece of rubber tube to join the nipple on the head to the mic.
# Be careful with the volume, as excess noise levels may damage your ears.
# The + and - 9V may be supplied by two 9V batteries wired in series and tapped at the junction.
# R11 is the volume control.
R1 1 10K 1/4W Resistor
R2, R3, R9 3 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 2.5K Pot
R12 1 330K 1/4W Resistor
R13 1 1K 1/4W Resistor
R14 1 3.9 Ohm 1/4W Resistor
C1 1 470uF Electrolytic Capacitor
C2, C3, C4 3 0.047uF Capacitor
C5 1 0.1uF Capacitor
C6 1 1000uF Electrolytic Capacitor
D1 1 Bi-Colour LED
U1, U2, U3, U4, U5 5 741 Op-Amp
MIC1 1 Electret Mic
J1 1 1/4" Phone Jack
MISC 1 Board, Wire, Sockets for ICs, Knob for pot, Stethoscope, Rubber tube