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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.|
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|The Circuit is super sensitive. But i could able to detect the heartbeat at the first stage of amplifier circuit. (i.e near R11). but when i connect the TRS jack to C6/R5 , i could not able to detect the heartbeat and it is completely no sound in the earphones even i have tried tuning the R11 pot. Could you please let me know why the second stage amplification is failed. Even in first stage amplification output near R11, i could see the pot is tuned to 2.2k (measured using multimeter between Pot Output pin and ground pin) where i can hear humming effect mixed with the hearbeat signal. Pl. provide your suggestion on this.|
|Are C6 and C8 wrongly marked? Should their locations be swapped?|
|I made this project, it is working very good . thank you.|
|The pin configuration of U1a ,U1b (as shown in circuit diagram) is not right . CAn you please send the right one|
|efficient circuit. working good in all aspects|
|sir would u please mention the cost and complete details of this project please..........|
|We made the stethoscope but instead of LM386 we used LM380 and instead of TL072 we used LM381 as in another book it was written so.. but in our output while using loudspeakers the volume is too low.. we didnt do the volume control part.. we attached an led in parallel wid speaker to check if the circuit is working, the led keeps on blinking but loudspeaker output is too low. also instead of a mic we used a crystal pick-up cartridge. do we need to shield cable the 3 wires from the pick-up cartridge? please respond asap! thanks!|
|i made this project and it all is working very good .But replace this mic with mobile phone mic this is very small in size and lower in noise....................thanx|
|i have done the project.its picking up sound.leds does't match with the heartbeat sound theres lot of buzz sound .and even i have altered it and added a counter to it.it working but the beats are not matching. suggest me something please|
|i have made the ckt but its not working and i have no idea about the battery which i have made is correct or not|
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