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/ Stay connected! Youtube Channel - https://www.youtube.com/channel/UCBkQn_WucQ8YpzRFY3EYqMQ Instagram - https://www.instagram.com/htmworkshop/ Twitter - https://twitter.com/HTMWorkshop Facebook - https://www.facebook.com/HTM-Workshop-101784815596164 Website - HTM-workshop.com