Can these LC circuits also run in real life and generate radio waves or I am doing something wrong ?
Circuit A : http://tinyurl.com/yayhfljx
Circuit B : http://tinyurl.com/y7z5uhqc

 

Your simulator shows it's working, but what frequency do you need?

 

I am asking because the simulator doesnt run with parasitic resistance(which can cause the oscillation sto stop at some point)
the actual inductor and capacitor values give a frequency of around 1 MHz

 

Sim does not seem right.

First of all the first schematic has both inputs shorted AC wise thru 5V source,
how can that oscillate ?

Second intrinsic LC resonant frequency, series or parallel, of 1 H and 100 uF
=

= 16 Hz, but scope pics do not show that.

I must be missing something.

Sim I got in ADIsim80 (no output), attached.



Regards, Dana.

 

The actual values that I am going to use for the project are
conductor : 2.2mH
cap : 10pF
Did anyone found what's missing ?

 

Thats a freq of ~ 40 Mhz, will need a wideband OpAmp.
And stray C will have a big impact.

Regards, Dana.

 

I dont understand how can a 2.2 millihenries inductor and 10 picofarad capacitor produce 40 MHz? Also at the end of the day is the cirquit correct or not ? I dont understand

 

I do not think the first OpAmp circuit is correct, and the Falstad sim does not seem right to me.

If you want to experiment at RF -


https://makerf.com/posts/experimenting_with_colpitts_oscillators

https://wiki.analog.com/university/courses/electronics/comms-lab-colpitts-osc


Here shows a low freq one using an OpAmp -

https://www.electronics-tutorials.ws/oscillator/colpitts.html


Regards, Dana.

 

Well I think this migh work but the problem is that the Voltage value keeps rising...What's going on? Please help
link : http://tinyurl.com/y82flsds

 

Traditionally the transmitters never are made by means of OpAmp. Thats the same as to produce the agricultural tractor by means of space satellite ion-flux engine.
First- opamp is too slow
Second, it is too weak
Third, it`s feeding is too clumsy
Fourth- it`s systemic stability is too bad
Fifth- just no-one is doing like that.
For transmitters are plethora of well working simple circuits what to find is just push the internet buttons.

 

I found this online http://tinyurl.com/y8nrby94 . Is this the right way or I am missing something again ?

 

I would like to know where you are getting these weird configurations.