Hi

i make an oscillator circuit ( colpitts) and the circuit work in multisim NI produce a sine wave with f=330 kHz
if i setup this circuit in bread board i some case not work ? what happen


thank
George

 

What is different when it works and when it doesn’t?

 

Your "7z" photo does not open.
An old 2N2222 has many pin-outs. Then its collector are emitter are swapped causing the transistor to not work.
Use a modern transistor like a 2N3904 instead.

 

Your "7z" photo does not open.
An old 2N2222 has many pin-outs. Then its collector are emitter are swapped causing the transistor to not work.
Use a modern transistor like a 2N3904 instead.

They can't be that modern. Both types are in the 1974 ITT catalogue!

 

the zip file indlude the multisim

 

In LTspice:
_____

 

In LTspice:
View attachment 318567_____View attachment 318566

in simulation worl but in breaborad not work

 

i find the problem i use two coil in series the total L=L1+L1+2M ;or L=L1+L2-2M i use RFC coil with L=1mH and th cricuir work fine

 

You can try this configuration:

or even this: