Friday, December 24, 2010

Electronic Stethoscope







Description



Part

Total Qty.



R1
1
10K 1/4W Resistor

R2
1
2.2K 1/4W Resistor

R3, R9               
0
Not used

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 (logarithmic) volume control

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
3
0.047uF/50V Metalized plastic-film Capacitor

C5
1
0.1uF/50V Ceramic disc Capacitor

C6, C7
2
1000uF/16V Electrolytic Capacitor

U1
U2, U3
U4
U5
1
0
1
1
TL072 Low-noise, dual opamp
Not used
741 opamp
LM386 1/4W power amp




MIC
1
Two-wire Electret Microphone

J1
1
1/8" Stereo Headphones Jack

LED
1
Red/green 2-wire LED

Batt1, Batt2
2
9V Alkaline Battery

SW
1
2-pole, single throw Power Switch

Misc.
1
Stethoscope head or jar lid, Rubber Sleeve for microphone.
















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