Good question, it provides more stability while also short very high frequency noise components at the input of the circuit. See more sensor circuit examples in this video collection th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html. Thanks for watching.
You offer an appropriate consideration of the circuit. You explain it very well; kudos! What type of pickup sensor is typically used for this application? If it is some type of audio microphone, then it bears mentioning that the type of microphone used would greatly influence the design of the circuit... For example, an Electret microphone uses a different circuit than a Dynamic microphone. At least that is what I know of audio microphone circuit design. Admittedly, I am no expert. I am not fault finding, here. It is just a thought for anyone considering actually building your design. Thank you so much for sharing your expertise, time and effort to teach us.
@t1d100 Thank you! My pleasure! You have a good practical point and I appreciate sharing your thoughts. I am assuming an Electret microphone in this Stethoscope Amplifier Circuit example. More Sensors Circuits Videos are posted in th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html video playlist.
You are welcome! Glad that you liked this Digital Stethoscope Amplifier video. I hope you also like the Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html and EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html Thank you.
A Digital Stethoscope Amplifier is explained in this video. Here are a few more Sensors and Circuits videos: EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html Bridge Audio Amplifier Explained th-cam.com/video/EDpu6urAtHA/w-d-xo.html Thermocouple Amplifier with Cold Junction Compensation Explained th-cam.com/video/-BsDLBI166U/w-d-xo.html Op Amp Amplifier with Electronic Gain Control th-cam.com/video/NoNgQpbj77Y/w-d-xo.html Push-Pull Power Amplifier with Darlington Transistors th-cam.com/video/866MYibo8yE/w-d-xo.html VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview th-cam.com/video/cFzYZsPEtP0/w-d-xo.html Electronic Gain Control for Op Amp Amplifier th-cam.com/video/NoNgQpbj77Y/w-d-xo.html Push-Pull Power Amplifier with Darlington Transistors th-cam.com/video/866MYibo8yE/w-d-xo.html Thermometer Circuit Design with Op Amp & BJT transistor th-cam.com/video/55YsraFE0rg/w-d-xo.html PhotoDiode Amplifier with Op Amp and MOSFET Explained th-cam.com/video/1c3EJ2d4pVI/w-d-xo.html Instrumentation Amplifier with Electronic Gain Control th-cam.com/video/C4tghZ-q6Zs/w-d-xo.html Voltage Regulator Op Amp Circuit with Foldback current limiting th-cam.com/video/VN4_qF9DvBM/w-d-xo.html Push-Pull Power Amplifier Design with Op Amp, Sziklai Darlington Transistors th-cam.com/video/8BFzsi7-Vbs/w-d-xo.html See more Sensors & Instrumentation Amplifiers videos in th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html Circuits playlist.
Glad that this Digital Stethoscope Amplifier is helpful. I highly recommend using a zero offset low noise CMOS Op Amp for this design. Here are a few related signal conditioning videos: EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html Bridge Audio Amplifier Explained th-cam.com/video/EDpu6urAtHA/w-d-xo.html Thermocouple Amplifier with Cold Junction Compensation Explained th-cam.com/video/-BsDLBI166U/w-d-xo.html
My pleasure! Glad that you like this video. Sure, please share circuits you have in mind, and if it's within my expertise I'll analyze it in a video. The list of existing 200+ circuits videos are posted in th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html videos playlist. Thanks.
I really like your content. If only I had this kind of detailed explanation of circuits as a young teenager over 50 years ago, when the only access to information I had was from expensive magazines and the local library reference section, which I could not borrow from and could not take home to study. Only one question for you, why is this called a digital stethoscope amplifier when it is just a simple analog amplifier? Is this just marketing BS by the manufacturer?
Glad that you like my videos and circuit design examples. I understand, I had similar limitations back in my early days as well. Regarding your question, this is not a marketing theme. A digital stethoscope requires initial analog signal conditioning (filtering and amplification) before analog to digital conversion for further digital post processing. In case you are interested here are additional practical examples: Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html Bridge Audio Amplifier Explained th-cam.com/video/EDpu6urAtHA/w-d-xo.html Thermocouple Amplifier with Cold Junction Compensation Explained th-cam.com/video/-BsDLBI166U/w-d-xo.html Electronic Gain Control for Op Amp Amplifier th-cam.com/video/NoNgQpbj77Y/w-d-xo.html VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview th-cam.com/video/cFzYZsPEtP0/w-d-xo.html I hope these circuit videos are interesting as well.
Thanks for watching and your interest in this circuit. As briefly explained in 3:40 and onward, there are large DC decoupling capacitors at the input of the circuit that effectively kills DC indicating that we dominantly have a zero at origin in the circuit. Here is another audio amplifier example: Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html that might be interesting and helpful.
Very nice example. Why are those 2 stages with different upper frequency? Does it have some practical advantage? And what is the 27pF input capacitor for?
Thank you! Good questions. This design method is not unique. There are many alternative techniques and methods to design these amplifiers. One reason for the higher bandwidth of the second amplifier stage is avoiding further magnitude drop at the upper passband edge of the first stage. As for the 27pf capacitor, it provides more stability while also shorting very high frequency noise components at the input of the circuit. More amplifier circuit videos are posted in th-cam.com/play/PLrwXF7N522y5679YAO-lFrNVYqV9XMNTr.html circuits playlist. I hope you like them as well.
what is the benefit of the 27pf capacitor ?
Good question, it provides more stability while also short very high frequency noise components at the input of the circuit. See more sensor circuit examples in this video collection th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html. Thanks for watching.
You offer an appropriate consideration of the circuit. You explain it very well; kudos! What type of pickup sensor is typically used for this application? If it is some type of audio microphone, then it bears mentioning that the type of microphone used would greatly influence the design of the circuit... For example, an Electret microphone uses a different circuit than a Dynamic microphone. At least that is what I know of audio microphone circuit design. Admittedly, I am no expert. I am not fault finding, here. It is just a thought for anyone considering actually building your design. Thank you so much for sharing your expertise, time and effort to teach us.
@t1d100 Thank you! My pleasure! You have a good practical point and I appreciate sharing your thoughts. I am assuming an Electret microphone in this Stethoscope Amplifier Circuit example. More Sensors Circuits Videos are posted in th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html video playlist.
This is interesting! Thank you for sharing
You are welcome! Glad that you liked this Digital Stethoscope Amplifier video. I hope you also like the Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html
and EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html
Thank you.
A Digital Stethoscope Amplifier is explained in this video. Here are a few more Sensors and Circuits videos:
EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html
Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html
Bridge Audio Amplifier Explained th-cam.com/video/EDpu6urAtHA/w-d-xo.html
Thermocouple Amplifier with Cold Junction Compensation Explained th-cam.com/video/-BsDLBI166U/w-d-xo.html
Op Amp Amplifier with Electronic Gain Control th-cam.com/video/NoNgQpbj77Y/w-d-xo.html
Push-Pull Power Amplifier with Darlington Transistors th-cam.com/video/866MYibo8yE/w-d-xo.html
VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview th-cam.com/video/cFzYZsPEtP0/w-d-xo.html
Electronic Gain Control for Op Amp Amplifier th-cam.com/video/NoNgQpbj77Y/w-d-xo.html
Push-Pull Power Amplifier with Darlington Transistors th-cam.com/video/866MYibo8yE/w-d-xo.html
Thermometer Circuit Design with Op Amp & BJT transistor th-cam.com/video/55YsraFE0rg/w-d-xo.html
PhotoDiode Amplifier with Op Amp and MOSFET Explained th-cam.com/video/1c3EJ2d4pVI/w-d-xo.html
Instrumentation Amplifier with Electronic Gain Control th-cam.com/video/C4tghZ-q6Zs/w-d-xo.html
Voltage Regulator Op Amp Circuit with Foldback current limiting th-cam.com/video/VN4_qF9DvBM/w-d-xo.html
Push-Pull Power Amplifier Design with Op Amp, Sziklai Darlington Transistors th-cam.com/video/8BFzsi7-Vbs/w-d-xo.html
See more Sensors & Instrumentation Amplifiers videos in th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html Circuits playlist.
I want to do this circuit in Proteus program can you please tell me the type of the component?
Glad that this Digital Stethoscope Amplifier is helpful. I highly recommend using a zero offset low noise CMOS Op Amp for this design. Here are a few related signal conditioning videos:
EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html
Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html
Bridge Audio Amplifier Explained th-cam.com/video/EDpu6urAtHA/w-d-xo.html
Thermocouple Amplifier with Cold Junction Compensation Explained th-cam.com/video/-BsDLBI166U/w-d-xo.html
This is great stuff thank you !!
Would you consider providing analysis on circuits based on viewers requests ?
My pleasure! Glad that you like this video. Sure, please share circuits you have in mind, and if it's within my expertise I'll analyze it in a video. The list of existing 200+ circuits videos are posted in th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html videos playlist. Thanks.
I really like your content. If only I had this kind of detailed explanation of circuits as a young teenager over 50 years ago, when the only access to information I had was from expensive magazines and the local library reference section, which I could not borrow from and could not take home to study. Only one question for you, why is this called a digital stethoscope amplifier when it is just a simple analog amplifier? Is this just marketing BS by the manufacturer?
Glad that you like my videos and circuit design examples. I understand, I had similar limitations back in my early days as well. Regarding your question, this is not a marketing theme. A digital stethoscope requires initial analog signal conditioning (filtering and amplification) before analog to digital conversion for further digital post processing. In case you are interested here are additional practical examples:
Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html
Bridge Audio Amplifier Explained th-cam.com/video/EDpu6urAtHA/w-d-xo.html
Thermocouple Amplifier with Cold Junction Compensation Explained th-cam.com/video/-BsDLBI166U/w-d-xo.html
Electronic Gain Control for Op Amp Amplifier th-cam.com/video/NoNgQpbj77Y/w-d-xo.html
VCA Electronic Gain Control (Part 1): Voltage-Controlled Attenuator Overview th-cam.com/video/cFzYZsPEtP0/w-d-xo.html
I hope these circuit videos are interesting as well.
Didnt you miss a pole in the origin somewhere?
Thanks for watching and your interest in this circuit. As briefly explained in 3:40 and onward, there are large DC decoupling capacitors at the input of the circuit that effectively kills DC indicating that we dominantly have a zero at origin in the circuit. Here is another audio amplifier example: Electric Guitar Amplifier to XLR Audio Signal th-cam.com/video/X4y8cwZdGEk/w-d-xo.html that might be interesting and helpful.
Very nice example. Why are those 2 stages with different upper frequency? Does it have some practical advantage? And what is the 27pF input capacitor for?
Thank you! Good questions. This design method is not unique. There are many alternative techniques and methods to design these amplifiers. One reason for the higher bandwidth of the second amplifier stage is avoiding further magnitude drop at the upper passband edge of the first stage. As for the 27pf capacitor, it provides more stability while also shorting very high frequency noise components at the input of the circuit. More amplifier circuit videos are posted in th-cam.com/play/PLrwXF7N522y5679YAO-lFrNVYqV9XMNTr.html circuits playlist. I hope you like them as well.