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How to build Electronic Stethoscope

2018-11-11 16:28  
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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

Electronic Stethoscope-Circuit diagram


R1 10K 1/4W ResistorR2, R3, R9 2.2K 1/4W ResistorR4 47K 1/4W ResistorR5, R6, R7 33K 1/4W ResistorR8 56K 1/4W ResistorR10 4.7K 1/4W ResistorR11 2.5K PotR12 330K 1/4W ResistorR13 1K 1/4W ResistorR14 3.9 Ohm 1/4W ResistorC1 470uF Electrolytic CapacitorC2, C3, C4 0.047uF CapacitorC5 0.1uF CapacitorC6 1000uF Electrolytic CapacitorD1 Bi-Colour LEDU1, U2, U3, U4, U5 741 Op-AmpMIC1 Electret MicJ1 1/4" Phone JackMISC Board, Wire, Sockets for ICs, Knob for pot, Stethoscope, Rubber tube


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 level 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.

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