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R1 and C3 together with N1 form the RC oscillator. Just look up the triggerring thresholds for N1 and calculate the time it takes for the capacitor to discharge from the higher threshold to the lower threshold and add it to the time it takes for it to charge from the lower threshold to the higher threshold. This sum will be your time period and its reciprocal will be the frequency.
did you simulate using a DC source or an AC source?
Remember when you add an AC source whole circuit is impulse response of the circuit and being convolved with AC source you add and that gives the system response.
do famous Fourier Analysis and find it. What software you are using. Use ADS to do it as it is more precise. Make up a range because all semiconductor devices have a range of frequencies they can be used.
thanks everyone for replying. actually i got this circuit from a website (address is given in diagram) and the sensors are just two probes.
i just want to calculate frequency at the pin 3 of N1 produced by R1 & C3.
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