This electronics video tutorial provides a basic introduction into oscillators and the barkhausen criterion. An oscillator consists of an amplifier and an attenuation network providing positive regenerative feedback. In order for sustain oscillations to occur, the amplifier and the positive feedback network must provide a total phase shift of 360 degrees to reinforce the oscillations at the input. In addition, the loop gain (product of the voltage gain and the attenuation factor) must be nearly equal to 1 for oscillations to continue. Transistors - NPN & PNP: https://www.youtube.com/watch?v=AcxDiesy-nI Operational Amplifiers: https://www.youtube.com/watch?v=idJEMYhrIfs Summing Amplifiers: https://www.youtube.com/watch?v=p4FQyOwjhLA LM386 Audio Amplifier Circuit: https://www.youtube.com/watch?v=MvTCROpv_jw LC Oscillator Tank Circuit: https://www.youtube.com/watch?v=nh4q7mIhLrY A Simple Oscillator Circuit: https://www.youtube.com/watch?v=3xins05jHCI _________________________________ A Simple Sine Wave Oscillator Circuit: https://www.youtube.com/watch?v=tjm5tMp8fyk The Transistor Oscillator Circuit: https://www.youtube.com/watch?v=PRbmQckP0cc LED Flasher Circuit: https://www.youtube.com/watch?v=WqpBT_vxos8 RC Phase Shift Oscillator Circuit: https://www.youtube.com/watch?v=M3nMVORPWhY Wien Bridge Oscillator Circuit: https://www.youtube.com/watch?v=geNOEzAMXKY __________________________________ Colpitts Oscillator Transistor Circuit: https://www.youtube.com/watch?v=z761q6rk-tw Hartley Oscillator Circuit: https://www.youtube.com/watch?v=3B_sBX_11Zw Single Transistor Esaki Oscillator Circuit: https://www.youtube.com/watch?v=wP5Sw76myNM Single Transistor LED Flasher Circuit: https://www.youtube.com/watch?v=2PuBFx9ebLA What Is Negative Resistance? https://www.youtube.com/watch?v=Eu5K1kCABT0 Colpitts Crystal Oscillator Circuit: https://www.youtube.com/watch?v=CxRqx4jKtHU _______________________________ Final Exams and Video Playlists: https://www.video-tutor.net/ Full-Length Videos and Worksheets: https://www.patreon.com/MathScienceTutor/collections