Turning a colpitts oscillator to AM transmitter

[zeller]

Hi,

I want to turn the attached colpiits oscillator which works fine into an Amplitude modulation transmitter, i know i need to add a tone generator somewhere on this circuit which will combine with the colpitts frequency to form an AM wave.

How do i do this without disturbing the colpitt's oscillations?

Please help, will appreciate your ideas.
Many thanks in advance.

 

[fg]

Hi,

There are different ways to generate AM modulation but I'm not too familiar with them, so I'm just re-posting the schematic as a .PNG file for easier viewing. That said, it looks like the collector and emitter resistors are too large; I wonder if the oscillator really works (it may work in a simulation, though).

 

[keith1200rs]

Thanks for posting the image - my phone seemed to be having trouble with the doc. My suggestion is to add another stage and do the AM on that otherwise I think you will have an AM/FM transmitter.

Keith