Hi experts,
Given my very theoretical education on wireless systems, I am used to seeing transmitters with mixers, filters, PAs, etc.
So I came across this simple FM transmitter online, and I am trying to understand how it works.
http://transistor-man.com/max2606 rfAN1869.pdf
So there's one MAX2606 IC, a VCO. I suspect it's a LC tank variety because of the L1. But I don't see how the audio input is up converted to FM band by the VCO. And I don't understand how the output from the VCO gets 'frequency modulated' before hitting the output antenna.
I appreciate any pointers.
Tom
Given my very theoretical education on wireless systems, I am used to seeing transmitters with mixers, filters, PAs, etc.
So I came across this simple FM transmitter online, and I am trying to understand how it works.
http://transistor-man.com/max2606 rfAN1869.pdf
So there's one MAX2606 IC, a VCO. I suspect it's a LC tank variety because of the L1. But I don't see how the audio input is up converted to FM band by the VCO. And I don't understand how the output from the VCO gets 'frequency modulated' before hitting the output antenna.
I appreciate any pointers.
Tom