Hi. How can I make a stable fm oscillator?
I have built this fm transmitter: **broken link removed** . But the oscillator is not stable... How can I fix this??
L1 should be made with large enuf wire that it is self supporting and physically stable, don't wind it on plastic or wood. Use a negative temperature coefficient capacitor for C5. Values from -100PPM to -750PPM are available, you will have to experiment.
I have tried that. It won't work.. If I buffer the oscilator, would that help? How can I build it more stable? Can I use crystal or ic for the local oscilator?