Can you build your own Electronic Stethoscope? Learn how to build and amplifier circuit

In this activity you will build an electronic stethoscope - ok its basically just an audio amplifier that uses physical amplification. We show you how to test the circuit and build the circuit. At the end we will show the signal on an oscilloscope. The electronic stethoscope electrical schematic will be used to build the first part of the circuit - which is an electret microphone. The microphone will be checked to verify it is working. Next we build the amplifier circuit and check to verify it is working correctly - we briefly how how the whole setup can work with a speaker - but the build for that part is going to be in a second video.

If you are looking for similar equipment to use
Milwaukee (without thermocouple) - https://amzn.to/37lJBT6
Best Wire Cutters - https://amzn.to/3xbgf4v
Function generator - https://amzn.to/38yEuj3
200 MHz Digital Oscilloscope 2 Channels, Grey - https://amzn.to/3x0KTxu

Timestamps
0:00 Intro
0:27 Electrical Schematic
1:14 Microphone Circuit
2:15 Microphone Circuit Power Check
3:55 Microphone Output
6:12 Amplifier Circuit
7:40 Amplifier Power Check
8:30 Amplifier Output
12:08 Connecting the Circuit
12:00 Measuring Amplified Signal
14:40 Physical Amplification
16:10 Heartbeat Signal
18:10 Optional Speaker

What you will need
• Resistors 1 kOhm and 100 kOhm
• Capacitors 1uF
• Breadboard(s)
• Jumper wires
• Amplifier LF 353 or alternative
• Power supply
• Resistors two 10 kOhm
• Electret Microphone

Optional
• Oscilloscope
• Function Generator
• Transistors and a Speaker if you want to try the schematic shown at the end

Here are some basic refreshers that are helpful to be able to complete this DIY project

Reading Electrical Schematics
• https://www.youtube.com/watch?v=9cps7Q_IrX0
• https://www.youtube.com/watch?v=_HZ-EQ8Hc8E
Using bread boards
• https://www.youtube.com/watch?v=6bWsIjw1fCM
Amplifiers
• https://www.khanacademy.org/science/electrical-engineering/ee-amplifiers/ee-opamp/v/ee-opamp-intro
Gain
• https://www.allaboutcircuits.com/textbook/semiconductors/chpt-1/amplifier-gain/
• https://www.allaboutcircuits.com/textbook/semiconductors/chpt-1/decibels/

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