Colpitts Oscillator Circuit Analysis (7 - Oscillators)

Let's design a radio frequency Colpitts Oscillator together. We'll be using a common-emitter configuration bipolar transistor.
Aaron Danner is a professor in the Department of Electrical and Computer Engineering at the National University of Singapore.
danner.group
Video filmed and edited by Cheryl Lim.
@randomcheryl

[@alessandrolurgo2767]

I am an aerospace engineer and a very beginner Electronics Amateur. You videos are the best I have found so far.

[@shawncalderon4950]

I am new to electrical engineering and find this presentation helpful. Thank you for making the complex understandable.

[@jawadtahmeed9854]

Excellent presentation. Learning my things again in a new way.

[@rickjljr11]

This is by far the best L-C oscillator analysis I've seen on You Tube.

[@wagsman9999]

Brilliantly clear. Thanks again. Hope your channel grows exponentially, you have a gift for explaining things.

[@amazagx]

Aaron, your videos are great!!

[@hectorbarrera9496]

Nice video, hope you could made a practical design for high frequencies.

[@bob_mosavo]

Thanks 😁

[@stevekim6923]

Hello professor Danner,

[@sifirzero]

Hello, can you explain the example of a metal detector with search coil head? great explanation

[@elektron2kim666]

I get a lot of FM activity in my research of making a DIY transistor amp.

[@kel-A-3414]

Other than the feedback network, is there anything else we need to alter in order to achieve higher frequencies?

[@williamfitzsimmons2154]

Could a 14Mhz colpitts oscillator be feasible on a breadboard with every other rail removed to reduce the parasitics?

[@hellopomelo2]

Hello Prof Aaron!

[@runforitman]

How does the LC tank provide the extra 180 degrees of phase shift required? I've tried AC analysis, but I could only find an extra 90 degrees

[@valentinmariatti2780]

Hi Aaron, thank you for this series of videos. I have one question regarding the equivalent circuit used to derive the conditions of oscillations, i can see that you used the Op. Amp equivalent circuit for the amplifier, is there a reason to use this model instead of the hybrid model or the pi model?

[@nandhakumara4082]

What is the type of transistor used BC107 or BCC547. Please reply.

[@Noconstitutionfordemocrats1]

Why don't inductors delay current?

[@stefano.a]

Very good explanation. Only one note: the circuit at time

[@charlieb.4273]

Thank you for your clear presentation. I am a little confused however about why the development of the conditions of oscillation are dependent on the existence of Rout. If the amplifier was perfect, Rin would be infinite like you assumed and Rout would be zero. Without the Rout term X1+X2+X3 would not need to be zero so you couldn’t derive the frequency equation or the gain relationship.