Electronic Stethoscope


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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.

Schematic

Schematic for Electronic Stethoscope

Parts

Part
Total Qty.
Description
Substitutions
R1110K 1/4W Resistor
R212.2K 1/4W Resistor
R4147K 1/4W Resistor
R5, R6, R7333K 1/4W Resistor
R8156K 1/4W Resistor
R1014.7K 1/4W Resistor
R1112.2K to 10K Audio Taper Pot
R121330K 1/4W Resistor
R13, R15, R1631K 1/4W Resistor
R1413.9 Ohm 1/4W Resistor
C1, C82470uF 16V Electrolytic Capacitor
C214.7uF 16V Electrolytic Capacitor
C3, C420.047uF 50V Metalized Plastic Film Capacitor
C510.1uF 50V Ceramic Disc Capacitor
C6, C721000uF 16V Electrolytic Capacitor
U11TL072 Low Noise Dual Op-Amp
U41741 Op-Amp
U51LM386 Audio Power Amp
MIC1Two Wire Electret Microphone
J111/8" Stereo Headphone Jack
Batt1, Batt229V Alkaline Battery
LED1Red/Green Dual Colour Two Wire LED
SW1DPST Switch
MISC1Stethoscope head or jar lid, rubber sleeve for microphone, board, wire, battery clips, knob for R11

Notes

  1. MIC 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 levels may damage your ears.
  3. R11 is the volume control.
  4. The circuit marked as optional is not required for the main circuit to function. The optional circuit blinks an LED to the heartbeat as it is heard by the microphone. Even if the optional circuit is not included, sound will still be heard via the headphone jack.

  5. Thanks to audioguru for correcting and improving this original schematic. He has essentially redesigned the circuit as a much improved version. Read about it in this forum topic.

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Comments

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Sanish
Electronic Stethoscope
Saturday, May 02, 2015 5:57:30 AM
Are C6 and C8 wrongly marked? Should their locations be swapped?
Amitha
Electronic Stethoscope
Thursday, March 19, 2015 8:47:32 AM
I made this project, it is working very good . thank you.
cheeko
Electronic Stethoscope
Monday, October 20, 2014 3:58:59 AM
The pin configuration of U1a ,U1b (as shown in circuit diagram) is not right . CAn you please send the right one
deepak
Electronic Stethoscope
Sunday, February 03, 2013 9:30:11 AM
efficient circuit. working good in all aspects
jagadish
Electronic Stethoscope
Thursday, August 30, 2012 10:44:44 AM
sir would u please mention the cost and complete details of this project please..........
abhipsa
Electronic Stethoscope
Monday, November 14, 2011 8:50:17 AM
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!
mostafa zied
Electronic Stethoscope
Sunday, May 22, 2011 12:51:19 PM
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
chethan
Electronic Stethoscope
Monday, April 19, 2010 9:54:55 AM
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
pranav
Electronic Stethoscope
Monday, March 01, 2010 8:21:51 AM
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
Harshil
Electronic Stethoscope
Tuesday, November 24, 2009 12:02:10 PM
its gr8 n ckt is proper, it in workng............thnks
Steven
Electronic Stethoscope
Friday, August 07, 2009 2:58:07 AM
The 2 batteries are in series to provide +9V and -9V ... see the ground line in between. They will not produce +18V !!!
Jiri Polivka
Electronic Stethoscope
Thursday, August 06, 2009 11:56:54 AM
A nice project! I detected several weak points: 1. The ordinary electret microphone is not sensitive enough to < 100 Hz where important heart sounds can be heard through a normal stethoscope. 2. Using two 9V batteries makes the instrument heavy, and using LM386 is not good due to a high current consumption. A headphone needs only a couple of mW, not 3 Watts LM386 can generate. 3. If "Stereo headphones" are used, only a mono response can be expected. Why not add another channel, microphone to earphone? 4. I would recommend using only one 9V battery and TL082 opamps. Does anyone know where to find a good small microphone with a good <100 Hz response?
GTN
Electronic Stethoscope
Tuesday, July 28, 2009 4:01:25 AM
sir mic is working but can't picking the heart beats.could you suggest other mic
fajar
Electronic Stethoscope
Thursday, July 16, 2009 7:13:58 AM
the power is ok. but the pre-amp not work !!!! why????
Sreenivasan
Electronic Stethoscope
Thursday, July 16, 2009 5:05:37 AM
Hi sir, i tried this project at our lab, but i couldnt get the exact heart beat as such, but instead we got some electronic sound which we think s of as heart sound. Why we couldnt get the exact heart sound as such?we've assembled as such given in the circuit.....eagerly waiting for reply....regards sreeni
bruno
Electronic Stethoscope
Tuesday, June 23, 2009 9:12:15 AM
you should find the "Two Wire Electret Microphone" at any electronics shop. Maybe called "capsule ECM" too. Or you could try a piezo-ceramic transductor also (found inside piezo buzzer). These 2 components runs for less than a $ !!!
azar
Electronic Stethoscope
Thursday, March 19, 2009 6:21:23 AM
sir, here we are facing a huge problem to make this Electronic Stethoscope..everything is ok except the electric mic which can collect the heart beat...we cant find such a mic which can collect the heartbeat and convert it to a voltage...please help us.
anonymous
Electronic Stethoscope
Wednesday, February 25, 2009 5:51:53 AM
hi ive tried making the unit. ive tried running it, it does not run, LED does not light up, no sound. Battery are warm. can you help me .
Stairo Dalyop
Electronic Stethoscope
Friday, February 20, 2009 7:47:17 AM
sir,i have try my best but there is some worming sound from the out put.how can i eliminate this sound.
sUBISH
Electronic Stethoscope
Saturday, February 07, 2009 3:55:24 AM
sir, here we are facing a huge problem to make this Electronic Stethoscope..everything is ok except the electric mic which can collect the heart beat...we cant find such a mic which can collect the heartbeat and convert it to a voltage. if you could send me a photo of how you assembled your components especially fixing mic in the Stethoscope
sowmya
Electronic Stethoscope
Saturday, January 17, 2009 1:01:48 AM
hi..... can u please specify the power rating of the ckt. and i planning to assemble this circuit on a pcb. even let me knoe bout the procedure involved in shielding of the condenser microphone. will b glad to be guided
anonymous
Electronic Stethoscope
Friday, December 19, 2008 3:38:32 PM
If the cicuirt needs 9 volts then why do you have two 9V batteries in series. This would deliver 18V.
anonymous
Electronic Stethoscope
Saturday, November 22, 2008 11:49:06 PM
sir, here we are facing a huge problem to make this Electronic Stethoscope..everything is ok except the electric mic which can collect the heart beat...we cant find such a mic which can collect the heartbeat and convert it to a voltage.
arif
Electronic Stethoscope
Sunday, October 26, 2008 12:09:22 PM
sir, here we are facing a huge problem to make this Electronic Stethoscope..everything is ok except the electric mic which can collect the heart beat...we cant find such a mic which can collect the heartbeat and convert it to a voltage...please help us.
Kelly
Electronic Stethoscope
Thursday, September 11, 2008 6:13:09 AM
Aaron I presume? Hi, I'm a busy RN who recently lost some hearing and am looking for an inexpensive alternative that may help with work. That aside, I have always been interested in learning electronic circuitry and would love to try this out. I've been learning a lot online and from my local electronics supplier and slowly making my way ... just wondering if you could send me a photo of how you assembled your components. Any helpful "golden-nuggets" of information to help me along the way would be appreciated. Kelly
anonymous
Electronic Stethoscope
Sunday, August 31, 2008 7:22:33 AM
how much current the circuit carry? Also mention its power consumption...?
muhiti
Didn't u forgot something??
Monday, May 12, 2008 3:07:18 PM
There is no biasing for op-amp u1a. Does it have the same biasing values with u1b??
ernest
Electronic Stethoscope
Wednesday, April 16, 2008 7:45:31 AM
sir, I would like to develop a PCB and make this stethoscope. Sir, could you send me more detail regarding the way it works in details. looking forward to hearing from you soon. Thanks
Varshini.P.R.
Electronic Stethoscope
Wednesday, April 16, 2008 4:39:26 AM
Is this stethoscope just an amplifier of heart beat? Or can it sense small strained vibrations? We are handling a project in which we have to convert strain pulse to voltage. Is this stethoscope identify minute vibrations?
emmanuel michael
Electronic Stethoscope
Saturday, April 12, 2008 10:17:55 AM
I Emmanuel Michael a 400 level physiscist of adamawa state university mubi Nigeria love reading electronics books, and electronics websites during my leasure ours.Iam coming across this website for the first time. I want to build it but afraid of because i dont have TL072 OP AMP, but have JRC4558 and I have studied the pin configurations. I also have LM1872 power OPAMP. I will be glad to be guided.
saurabh
Electronic Stethoscope
Saturday, April 12, 2008 12:31:51 AM
hi . . .can you plz tell me abt the procedure involved in shielding of the condenser microphone.
kehinde
Electronic Stethoscope
Friday, April 11, 2008 9:12:41 PM
Sir, i will appreciate it if u can send a complete analysis on this electronic stethoscope to me. Is it possible to view the heart-beat rate on seven segment display? If so, how? I am presently working on this as my final year project. I will be so much glad if an urgent reply can be given to me. THANK YOU.
Kamardeen
Electronic Stethoscope
Thursday, March 27, 2008 6:15:39 AM
Can you pls send me the complete circuit diagram and the operational write up of the project. i need it for my PGD project next month.
mehak
Electronic Stethoscope
Wednesday, March 12, 2008 11:43:08 AM
sir,i cant fid an electret mic,can u suggest a place,or an alternative!!!plz its urgent!!
anonymous
Electronic Stethoscope
Thursday, February 28, 2008 7:47:10 AM
sir, please give me the complete details of this schematic diagram..we're gonna use for our final defence..tnx..it is very interesting project..
charles
Electronic Stethoscope
Sunday, February 24, 2008 5:21:38 PM
I am interested in getting any more information on the electronic stethoscope you can supply
seema
Electronic Stethoscope
Saturday, February 23, 2008 12:41:39 PM
hello sir..i seem this project too much interesting...i want to make it as my final year project..i want the full circuit diagrams n details...can u pls help me out??
sundaresan
Electronic Stethoscope
Wednesday, February 20, 2008 3:37:03 AM
Sir, i request you to please provide me with the complete details regarding this project as i would like to do this as my project.about me i am m.tech in bio medical engg in VIT i select this project as a mini project so pls help me.
vinus
Electronic Stethoscope
Friday, February 15, 2008 7:18:05 AM
this is awsome idea,,,
shahed murad
Electronic Stethoscope
Sunday, February 03, 2008 2:37:53 PM
sir i compleat this project and then write a compleat thises on this . sir if you have time to study my thises please send me your mailing address to send you .
madeshwaran
Electronic Stethoscope
Monday, January 28, 2008 9:32:33 AM
sir,i take this circute of my Msc final year project.so i want full theory material of it circuit,please sent to mail.Thakk you
julius O. dela cruz
Electronic Stethoscope
Sunday, January 27, 2008 7:48:21 PM
sir can u give me additional information about this project?i want to do this for my final project.i dont have a lot of time to look other project.your circuit is too great and useful.tnx
shravan
Electronic Stethoscope
Saturday, January 26, 2008 6:43:16 AM
Sir, i request you to please provide me with the complete details regarding this project as i would like to do this as my project.
Elishba
Electronic Stethoscope
Thursday, January 24, 2008 12:28:39 AM
Its to difficult to make a stethoscope the circuit of sethoscope is toooooooooooooooooo difficult tounderstand.
PRASANNA.J
Electronic Stethoscope
Wednesday, January 23, 2008 5:09:21 AM
Hello sir,I like to do this project in my college so please send more information about this project
anonymous
Electronic Stethoscope
Monday, January 21, 2008 12:33:38 PM
Please help me with the circuit details i.e. working principles. I want to use it for my final year project. Pls help anyone with the answer... pls.
gaara
Electronic Stethoscope
Thursday, January 17, 2008 5:47:50 AM
Sir, i would like do this as my mini project , coluld you please forward me some more detail in this regard.
E.I Paragas
Electronic Stethoscope
Monday, January 14, 2008 10:05:03 AM
hi sir ....can u give me more details about the project.. This information will be is included for my proposal. pls send it to my email add.....thank you sir....have a nice day..
ASHA & CHINCHU
Electronic Stethoscope
Wednesday, January 09, 2008 4:27:18 AM
sir, We would like to know the total cost of the project & the PCB designing as we are going to do a mini project on this. We are bio-medical engineering students ,we need to do a mini project for this sem. & we are expecting reply soon. Thanking you.
Anand
Electronic stethoscope
Sunday, January 06, 2008 1:51:42 AM
Sir, it was a great project. Please give me more details about this project. I want to do this as my class project. Sir please send as early as possible.
vishnu mohan
Electronic Stethoscope
Tuesday, December 18, 2007 5:03:41 AM
sir, it's really avery good job. I wish to do this as my mini project. please give me more information soon.
Khan
Electronic Stethoscope
Friday, December 07, 2007 5:04:39 AM
Dears, Great Job. I would like to develop PCB and make this stethoscope. Sir, could you send me more detail regarding this info. looking forward to hearing from you soon. Thanks
anchal
Electronic Stethoscope
Thursday, December 06, 2007 9:49:55 AM
you do a fantastic job. plz can u elaborate the topic. i want to make my class project on this and can u plz give me some more new ideas
rama krishna dutt
Electronic Stethoscope
Monday, December 03, 2007 8:10:42 AM
can you clearly tell what type of stethoscope is to be used either a stethoscope which is oftenly used by doctors or any other.
Prat
Electronic Stethoscope
Wednesday, November 14, 2007 7:23:17 PM
can u send me the more details on this circuit diagram.. I want to do the circuit on a pcb board any ideas plz...
blair babida
Electronic Stethoscope
Saturday, November 10, 2007 12:24:40 AM
please help us on our thesis. we are on our final year and as required, we need a detail on this project. can you send it to us? pls
barikuma
Electronic Stethoscope
Thursday, November 08, 2007 6:59:25 AM
can it be made simpler than this.
swati
Electronic Stethoscope
Sunday, November 04, 2007 1:53:37 AM
can someone plz give me the detailed design of this project??

(Editor's notes: Scroll up about 6 inches.)

Sean Macken
Electronic Stethoscope
Wednesday, October 31, 2007 9:46:45 AM
could you name the function of each of the five op amps. thank you
Sean Macken
Electronic Stethoscope
Wednesday, October 31, 2007 9:40:49 AM
just wondering if you could name the function of the op amps 2 through 5 inclusive i will look them up for there. many thanks.
soumya
Electronic Stethoscope
Saturday, October 20, 2007 10:21:56 AM
im a final year graduate student.i want d working of this circuit..so that i can use this as my final year project.pls if any1 wld lik to share his/her idaes in this project can send me d mail....thnks.. waiting for ur reply...
poonam vishwakarma
Electronic Stethoscope
Saturday, October 13, 2007 12:31:30 PM
im a final year graduate student.i want d working of this circuit..so that i can use this as my final year project.pls if any1 wld lik to share his/her idaes in this project can send me d mail....thnks.. waiting for ur reply...
sonu
Electronic Stethoscope
Saturday, October 06, 2007 2:08:23 PM
hi, this circuit is very practical and helpful for graduating students. i have selected as my project for opamp. I need some help, so please guide me 1_ What is the different between this circuit and an audio amplifier.? 2_ Why are there 5 opamps used? What are the working and advantages of each? 3_ Is there any replacement for phone jack and mic, like a speaker etc. Plz help me out with these queries as soon as possible. i will appriciate your quick reply. looking forward for it. THANKS
shilpa
Electronic Stethoscope
Saturday, October 06, 2007 1:37:10 AM
i want to start tyhis project bt as it will be my very first project so i need some help.. i want to know the complete working of this ......thxs in advance.. ur reply will be an encouragement for me to sart wth this.... waitin for ur repy.. kindly do give ur few minutes to my query.
sobo abiodun k
Electronic Stethoscope
Tuesday, October 02, 2007 9:57:59 AM
could you please send the full circuit specification on electronic stethoscope to me.I want to build it as my final-year project @ Yaba College of Technology lagos Nigeria.
Chris
Electronic Stethoscope
Saturday, September 29, 2007 10:43:55 PM
Good project. Can I adopt your circuit as one of our options for our project proposal using op amps? tnx very much. God Bless!
anonymous
Electronic Stethoscope
Saturday, September 29, 2007 12:42:31 PM
please give me the detailed working of this equipment....as m final year student and i have taken this project....... plz....reply soon.....
muhammed
HELP
Tuesday, September 25, 2007 8:00:55 AM
hi, this circuit is very practical and helpful for graduating students. i have selected as my project for opamp. I need some help, so please guide me 1_ What is the different between this circuit and an audio amplifier.? 2_ Why are there 5 opamps used? What are the working and advantages of each? 3_ Is there any replacement for phone jack and mic, like a speaker etc. Plz help me out with these queries as soon as possible. i will appriciate your quick reply. looking forward for it. THANKS
Ahmed
Electronic Stethoscope
Friday, September 21, 2007 4:48:53 AM
Hi, I am a final year Electrical and Electronics Engineering student of the University of Maiduguri, NIGERIA. I would like details of the electronic stethoscope for my final year project. Thank you.
anonymous
Electronic Stethoscope
Thursday, September 20, 2007 5:42:22 AM
Hi aaron...I am natraj doing my 3rd year electronics and communication engineering.... I would like to do your idea on electronic stethecope as my mini project.So if you are willing please send me the details and cost of doing the project......AS SOON AS POSSIBLE With thanks...nataraja
nilesh kumar vats
DIgital Stethoscope
Thursday, September 20, 2007 5:05:58 AM
hi sir i am final year b-tech biomedical engineering student.sir i want to do project on digital stethoscope. so uyou provide me details os this project & gide me.
PAWAN KUMAR
Electronic stethoscope
Monday, September 17, 2007 11:55:54 PM
This is a very good project for UG level engineering students. I am a biomedical engineering student. sir please give me the details.
Daffwan Titus
Electronic Stethoscope
Monday, September 17, 2007 1:53:03 PM
I really would appreciate it if you send the details of the above subject cos i intend to do this for my project . COUNTING ON YOU SHARP RESPONSE! THANKS.
sumanta
electronic stethoscope
Sunday, September 16, 2007 11:25:14 AM
hello sir,i am a 3rd year B.E. student of dibrugarh university,assam.i need a project containin 741IC series.i will be very greatful if you send me the full details of this electronic stethoscope.thanking you.
Vikrant
Electronic Stethoscope
Thursday, September 13, 2007 5:14:24 AM
Sir, I am final yr. student. I would like to submit this circuit as my mini project. Please send me the details.

(Editor's notes: Scroll up 6 inches. There you go.)

anonymous
Electronic Stethoscope
Friday, September 07, 2007 5:53:48 PM
i am a final year student in the UNIVERSITY OF BENIN NIGERIA i am doing the construction of an electronic sthetoscope for my project i will need a detailed description of it. i will be highly grateful if my request is favourably considered.
Masud
Electronic Stethoscope
Wednesday, September 05, 2007 3:34:22 AM
I am a 4th year B.Sc Electrical Engineering student.Now I need full description about the electronic stethoscope cause I want to do this project successfully which will submit me a good grade from my university.Please help me.Thanks
Dipu
Electronic Stethescope
Tuesday, September 04, 2007 8:49:32 AM
Hi aaron...I am dipu doing my 3rd year biomedical engineering.... I would like to do your idea on electronic stethecope as my mini project.So if you are willing please send me the details and cost of doing the project......AS SOON AS POSSIBLE With thanks...DIPU
Dejan
Electronic Stethoscope
Tuesday, September 04, 2007 6:50:10 AM
Hi! Nice idea, I also would like additional details, please send it to my address. Tnx!
kamal kumar jain
Electronic Stethoscope
Sunday, September 02, 2007 4:52:59 AM
Nothing like it. Mind send me its full detail & working on my Email account.Thank you.
Niladri Deb Roy
Electronic Stethoscope
Saturday, September 01, 2007 3:06:35 AM
i m a 4 th yr.. medical electronics student... i m really interested to take up this subject as my project... can u please give me the detailed circuit diagram of electronic stethoscope...
naveen
Electronic Stethoscope
Friday, August 31, 2007 6:23:11 AM
Hi..i want 2 know d circuit detail and uses of electronic stethoscope.....plz do send the details on my mail.... I will b highly obliged 2 u...
minu
Electronic Stethoscope
Friday, August 31, 2007 5:59:38 AM
hi, i am post-grad student, and i would like some ideas for my mini-project...i liked this circuit too....can u pls give me any details...and suggest any other topics???
Suman Kayastha
Electronic Stethoscope
Tuesday, August 28, 2007 7:16:17 AM
It is wonderful bio-medical suppliment device, it's sound is not perfect.
Sanket Vanjare
Electronic Stethoscope
Wednesday, August 22, 2007 2:48:15 AM
Sir/Madam, My name is Sanket M Vanjare.I am studying in GPM college Bandra(E).I AM doing my diploma in 3rd year Instrumentation Engg.In this year we have the subject PROJECT & SEMINAR.So,I request you that,send me the information about above subject,or the subject related to PROJECT ON TESTING & CALIBRATION.
ankur
Electronic Stethoscope
Saturday, August 18, 2007 11:31:08 AM
i have no idea for making project
manoj.s.michael
Electronic Stethoscope
Saturday, August 18, 2007 9:00:25 AM
hi..pls can u send me the details and full description about how the circuit works to my mail...i'm a 4th yr ece student...
alex
Electronic Stethoscope
Tuesday, August 14, 2007 10:08:27 PM
hey...this is cool...i want to try it..can you end me some details to guide me in doing this project.thanks..more power!
Pratik
Electronic Stethoscope
Wednesday, August 08, 2007 6:39:40 AM
Hi, i am Pratik, studying in Electronics and Communication.I really liked this project, and i want to do it, please send me the details of the project on my email....Thank you
anonymous
Electronic Stethoscope
Friday, August 03, 2007 3:39:33 AM
how do u capture sounds from a electronic stethoscope?
anonymous shrinidhi
Electronic Stethoscope
Thursday, August 02, 2007 3:36:54 AM
IAM nidhi STUDING IN ELECTRONICS n communication DEPARTMENT. I REALLY WANT TO KNOW THE DETAIL CIRCUIT OF ELECTRONIC STETHOSCOPE. WILL U PLEASE KINDLY ACCEPT MY INVITATION AND SEND ME THE PROPER DETAILS THANKING YOU.
priya
Electronic Stethoscope
Wednesday, August 01, 2007 2:45:51 AM
Could you please tell me about the project in detail as well as the design specifications as i want to do this project.
umukoro akpo
Electronic Stethoscope
Tuesday, July 31, 2007 9:53:30 AM
just to know more about its mode of operation
nouni
Electronic Stethoscope
Saturday, July 28, 2007 9:44:10 AM
i m really surprised to know that stethoscope is useful in electronics too hence would really like to give a shot to this project
vijay pritha
Electronic Stethoscope
Friday, July 27, 2007 10:12:46 AM
its very nice. i am interested to take it up as my project. pls gv the detailed specifications of the ckt and its form n nature of the output
anonymous
Electronic Stethoscope
Thursday, July 26, 2007 8:45:02 PM
PLEASE NOTE - THIS IS NOT AN ACTIVE CIRCUIT DISCUSSION ON STETHOSCOPES. DO NOT POST NEW QUESTIONS OR COMMENTS TO THIS SUBJECT. PLEASE USE THE FORUM SO WE CAN ALL DISCUSS THIS MORE ACTIVELY. THANKS.

(Editor's notes: Well duh.)

wan mohd bukhari bin wan daud
Electronic Stethoscope and its design
Sunday, July 22, 2007 12:17:19 PM
hi Aaron,im Wan from University Technologies of Malaysia , im studying in medical electronic eng...so i want a detail info from ur design to complete for my PSM..please.
AMEN NEWTON
Electronic Stethoscope
Friday, July 20, 2007 9:56:21 AM
PLS CAN U SEND ME DETAILS AND FUNCTION OF EACH COMPONENTS ON BOARD AND HOW TO PLACE EACH COMPONENT ON THE PCB. i would be grateful if this request is attended to urgently.

(Editor's notes: Try the forum.)

jagan mohan
Electronic Stethoscope
Thursday, July 19, 2007 5:14:09 AM
it very nise but the ckt is big why it can't be repsent in 3d view
MEHTA DHARMESH R.
Electronic Stethoscope
Thursday, July 12, 2007 4:36:34 AM
i m a engg. student gujarat univercity i want to take it for a project and need the design specifications thank you
famuyide laolu
Electronic Stethoscope
Monday, July 09, 2007 10:14:12 AM
hi,i just want to know the construction of it because am having it as my final projec pls help me out.and the write up of it.thanks
Anusha
Electronic Stethoscope
Saturday, July 07, 2007 4:20:08 AM
pls i m a 4th year student nagarjuna university in india i want to take it for a project and need the design specifications thank you
manic
ELECTRONIC STETHOSCOPE
Saturday, July 07, 2007 3:50:32 AM
HI AARON IAM MANI STUDING IN ELECTRICAL AND ELECTRONICS DEPARTMENT. I REALLY WANT TO KNOW THE DETAIL CIRCUIT OF ELECTRONIC STETHOSCOPE. WILL U PLEASE KINDLY ACCEPT MY INVITATION AND SEND ME THE PROPER DETAILS THANKING YOU.
hareesh
Electronic Stethoscope
Thursday, July 05, 2007 4:42:31 AM
Hi I am hareesh. I would like to have to have the design spefications and further details about this project. Thank you
anonymousnathiya
Electronic Stethoscope
Tuesday, July 03, 2007 9:38:25 AM
it's very nice. please give me the whole descripition and circuits about this project.thank u
anonymous
Electronic Stethoscope
Tuesday, July 03, 2007 5:57:26 AM
would u pls send me the pcb layout?
anonymous
Electronic Stethoscope
Monday, July 02, 2007 1:29:03 PM
hi, aaron! i am saranya.......i am a 3rd year biomedical student.........i am gonna carry on u'r idea's as my mini project.............can i get the further theoretical info about u'r circuit..........

(Editor's notes: Try the forum.)

anonymous
Electronic Stethoscope
Friday, June 22, 2007 10:05:22 AM
Hi Aaron,this is Margarete .Cound elaborate on were to find the information on the forum. Congratulattion

(Editor's notes: Search.)

midhun
Electronic Stethoscope
Thursday, June 21, 2007 2:52:18 AM
i have selected this as my project and it worked..Iwould like to know the exact working..
Zogging
Electronic Stethoscope
Monday, June 18, 2007 11:52:11 AM
Hi Arron, how do i get the design calculation of the circuit diagram of the electronic stethoscope.
sara
Electronic Stethoscope
Monday, June 18, 2007 9:42:18 AM
sir,as i've made this as my mini projt pl give me details of this circuit.i'd also like to know the working of bi-colour LED.also is there any other sensitive mic that can be used?
nnamdi
digital Stethoscope
Sunday, June 17, 2007 12:34:09 PM
pls i m a 5th year student madonna university in nigeria i want to take it for a project and need the design specifications thank you
Quintus
Electronic Stethoscope
Monday, June 04, 2007 9:05:26 AM
Hi Aaron, could u pls elaborate on were to find the info on the forum. thanx Quintus

(Editor's notes: Search for it. Several topics exist, in several different subforums. Use the search function.)

RAPHAEL
Electronic Stethoscope
Wednesday, May 30, 2007 11:12:19 PM
hi,i am a student from nigeria.i have to thank you for the great you hav done,as i sucessfully carry out the project and it worked.please supply more theoretical basis for its operation
udhav
Electronic Stethoscope
Saturday, May 26, 2007 10:36:45 AM
i want to bult up tethoscope
udhav552
Electronic Stethoscope
Saturday, May 26, 2007 10:14:35 AM
please give me pcb diagram
Alex
Electronic Stethoscope
Thursday, May 17, 2007 11:06:38 AM
Hi Aaron,this is Alex,I am forth year Electrical Engennring student,Plz give me clear information abt the electronic stethoscope,as i wanna make it as my minor project, also give me the detail circuit descreption,the conection of Electrt Mic,and also can I conect the phon jac to the speaker?
Quintus
Electronic Stethoscope
Tuesday, May 15, 2007 10:16:54 AM
I build this circuit, the 1st time it did not work,but i used a LM 324 insted of 5 LM741's. if some one could pls help me with the last part, my signal dissapears at U2 and so i've changed the filter to a sallen key low pass filter, and it still doesn't work. U3 doesn't amplify and then the signal dissapears. PLS!!!!!

(Editor's notes: There is a detailed topic in the forum discussing this circuit.)

mustafa ismail
Electronic Stethoscope
Thursday, May 03, 2007 8:51:53 PM
I'm mustafa Ismael from Cairo it is a good circuit but there is one wrong thing U5 must be connected to -9V at point 4
Eng.Abdullah
Electronic Stethoscope
Friday, April 27, 2007 1:19:43 AM
Hi all , iam a biomedical Engineering student in united arab emirates ,,, i made this project and its working ,, really it is very interesting ,, they gave me certificate to encourage me ,, thanx for all,,, plz sir give more ccts in biomedcial subjects
Steve_hi
Electronic Stethoscope
Tuesday, April 17, 2007 4:28:49 PM
Hi Aaron I was wondering from all the comments on Electronics Lab forum and the difficulties in getting the above schematic to work properly if it might not be an idea to post the schematic produced by AudioGuru Just a suggestion Steve

(Editor's notes: It will be done next time I update.)

anonymous
Electronic Stethoscope
Tuesday, April 17, 2007 8:23:54 AM
dear sir, iam interested in this cct of yours pls kindly send detail on the cct diagram ,component list, and the principle of operation.i'll be greatful working with you.thanks
anonymous
Electronic Stethoscope
Monday, April 16, 2007 6:44:26 AM
i need help on this project any deatail plz
anonymous
Electronic Stethoscope
Monday, April 16, 2007 6:39:44 AM
can anyone give me the deatil of this project
Sunny
Electronic Stethoscope
Monday, April 16, 2007 2:56:30 AM
Dear Sir, is this cct is working the cct as shown above i am going to use as a mini project plese send details
gunjan
Electronic Stethoscope
Sunday, April 08, 2007 8:41:22 AM
sir i'm very much interested in this project and using it as a basic circuit for heart sound recorder. i'll be very glad and thankful if you please send me the details of this project. i'm an ongong B.E. student.
ifiok
Electronic Stethoscope
Tuesday, April 03, 2007 9:33:29 PM
dear sir, iam interested in this cct of yours pls kindly send detail on the cct diagram ,component list, and the principle of operation.i'll be greatful working with you.thanks
anonymous
Electronic Stethoscope
Sunday, April 01, 2007 7:00:25 AM
this stupid ckt is not workin. do send me itz detail on my email id
sushmitha
Electronic Stethoscope
Saturday, March 31, 2007 8:40:05 AM
Can you please tel whether can this be taken for a mini project?? How does it cost on the whole??
rajeev
Electronic Stethoscope
Friday, March 30, 2007 5:44:09 AM
dear sir, can i get the theory on this project & detail use on this. So i can do project on this.
anonymous
Electronic Stethoscope
Thursday, March 29, 2007 7:17:13 AM
can i get more details about this topic so that i can do project on it
sarath sundar
Electronic Stethoscope
Saturday, March 24, 2007 9:23:21 AM
can i get the theory on this project & detail use on this. So i can do project on this.
anonymous
Electronic Stethoscope
Thursday, March 22, 2007 4:53:13 PM
circuit implement on breadboard
k.rajini
about ckt
Monday, March 19, 2007 1:08:00 PM
i want you to make the ckt smaller because if i saw this ckt i thought it is very lengthy ..Iam doing biomedical engg final year .we also designed an electronic steth .but the circuit of that is smaller than yours .....so i want the ckt very precisly,,,to understand very easily.ok
Harsha
IS IT WORKING
Friday, March 16, 2007 5:50:28 AM
Is the circuit here working ?? Anyone tested it ???
shahzadah Khurram
Electronic Stethoscope
Thursday, March 15, 2007 4:29:33 AM
Pls give its breaf discription,I want to Make it digital
ziyanda
Electronic Stethoscope
Tuesday, March 13, 2007 5:39:47 AM
plz email me the info in how the bi-colour LED works and of it is okay to make oy output jack headphones or a speaker???
Steve Buzzell
Electronic Stethoscope
Friday, March 09, 2007 6:25:21 AM
Just wondering what the bi-color Led is for nice project im attempting it now but my bi-color led has 3 legs i dont know how to connect it
rajaram G
beat per minute monitor using piezo sensor.
Sunday, March 04, 2007 2:49:15 AM
Display with lcd mnitor and micro controler . please send the amp circuit and idea about that. thanking you
Mandeep Singh
Electronic Stethoscope
Friday, March 02, 2007 12:23:37 AM
Plz give me clear information abt tne electronic stethoscope,as i wanna make it as my minor project, also give me the idea abt the cost.
shanmuga priya
Electronic Stethoscope
Thursday, March 01, 2007 4:31:10 AM
i need some of the theory about electronics stethoscope
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