I'm designing this oscillator for a start-up product and am having trouble with the amplitude control. I'm using the simple feedback resistors. I seem to be needing ~20k for Rg and 82k for Rf which is not the gain=3 that seems to be theorized... but it works. My problem is that it is very much temperature dependent and the Rg must change from 18k-22k for the range of ambient temperatures for which it will be rated for.
I've considered using Thermistors but not sure about specifics. I know the Rg should be PTC or the Rf should be NTC but past that not much.
Also, do you guys think that a diode stabilized control will be more robust? should I ditch all this crazy thermistor stuff and go for a few mote components?
Thank you,
I've considered using Thermistors but not sure about specifics. I know the Rg should be PTC or the Rf should be NTC but past that not much.
Also, do you guys think that a diode stabilized control will be more robust? should I ditch all this crazy thermistor stuff and go for a few mote components?
Thank you,