Electronic Stethoscope II
Stethoscopes are not only useful for doctors, but home mechanics, exterminators, spying and any number of other uses. Standard stethoscopes provide no amplification which limits their use. This circuit uses op amps to greatly amplify a standard stethoscope, and includes a low pass filter to remove background noise.
Circuit diagram Parts: R1 10K 1/4W Resistor R2, R3, R9 2.2K 1/4W Resistor R4 47K 1/4W Resistor R5, R6, R7 33K 1/4W Resistor R8 56K 1/4W Resistor R10 4.7K 1/4W Resistor R11 2.5K Pot R12 330K 1/4W Resistor R13 1K 1/4W Resistor R14 3.9 Ohm 1/4W Resistor
C1 470uF Electrolytic Capacitor C2, C3, C4 0.047uF Capacitor C5 0.1uF Capacitor C6 1000uF Electrolytic Capacitor D1 Bi-Colour LED U1, U2, U3, U4, U5 741 Op-Amp MIC1 Electret Mic J1 1/4" Phone Jack MISC Board, Wire, Sockets for ICs, Knob for pot, Stethoscope, Rubber tube
Notes: 1. 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. 2. Be careful with the volume, as excess noise level may damage your ears. 3. The + and - 9V may be supplied by two 9V batteries wired in series and tapped at the junction. 4. R11 is the volume control.
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