I designed a clapp oscillator that must deliver 2 MHZ but in simulation it doesn't works.

Can anyone help me, please?

 

For resonance at 2MHz, C3 and C4 should be more like 100pF.

 

Calculator to get freq -

https://www.mycircuits9.com/2012/06/clapp-oscillator-calculator.html


Regards, Dana.

 

Calculator to get freq -

Hmmm...
How do you know where C1, C2, C3 are connected in that calculator?

 

Educated guess, C1 in series with L, and the other two the series
connection of the two caps. Try it for the ciruit and results you have.

Or it could be this -

Regards, Dana.

 

For resonance at 2MHz, C3 and C4 should be more like 100pF.

I've changed all te values and still doesn't work. This could be a problem with multisim?

 

Calculator to get freq -

https://www.mycircuits9.com/2012/06/clapp-oscillator-calculator.html


Regards, Dana.

The results don't match with my math and even with these, still doesn't work but thank u.

 

My oscillator is working! But the frequency in the oscilloscope is 159Hz and I in my calcules the frequency is close to 10MHz. Could be the inductor in the coletor of the transistor?

 

Your C3, C4 look way out of range. Take a look at this solution running around 1 Mhz.

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


Regards, Dana.,

 

Change C3,C4 to 10 nF...and L2 470nH.

That should be 2.3Mhz.

 

Thank you, guys.
I solved my problem and my circuit is working in my protoboard too.