Self-oscillating Clapp Osc

370

06:21:29

Otherwise known as the "Modified Colpitt's Osc". In this app it isn't oscillating, probably EveryCircuit isn't programmed to run self-oscillating circuits yet but this has been tested in the real world and it works. With the equation of 1/2pi*sqrtLC you should get an oscillation of close to 68KHz sinewave. 

I tried injecting noise and it still doesn't work in this app. I guess it'll be great if EveryCircuit was programmed to include a default electrical noise that people could work with to test their circuit for oscillation or noise floor amplification.

published 11 years ago

hurz

11 years ago

Its oscillating quite nice at simspeed 30us/s and shake to start.

hurz

11 years ago

But C is: 1/(1/22e-9*2+1/3.3e-9)= 2.54nF which is then with 2.5mH 63.2kHz resonace. EC oscillates at around 62.5kHz which is close enough i think.

hurz

11 years ago

And search here for "pierce oscillator" I made 3 of them quite some time ago and they all work fine.

normhayashi

11 years ago

Thanks for the tip! It didn't occur to me to increase the time resolution to the microseconds range.

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