and what did you mean "C9 provides AC coupling" , i think it to block DC signal in IC2 but why ?
thanks
that what i think , should it has a large value for a lower impedance to AC signal ?
Nigel's covered the C9 value. R9 value isn't critical, but some positive feedback is needed to make IC2 oscillate.Could you give me more details just a bout R9,C9 values ?
How i can determine the range of inductance/capacitance can i measure ?
You've just answered your own questionusing that method ........when i simulate the circuit using proteus for L=100uH , C=1nF i get this result ::
there is an Oscillation for a capacitor value between (10pf , 1uf)
for inductor value between (600nh , 100mh)
more details please !the hysteretic switching levels of the oscillator are at 1/3 and 2/3 of the supply voltage (5V).
but the integrator equation is 1/RC x ∫Vin dt ?R10,C10 form an integrator (low-pass filter) such that the voltage across C10 becomes the average of the changing voltage at pin 7 of IC2.
The time taken will depend on at least the initial state of charge of C10, the output impedance of IC2, leakage current through C10, and resistor tolerances. In other words the calculation would be very difficult. If you assume the pin 7 oscillation has a 1:1 mark/space ratio and that pin 7 can be pulled rail-to-rail then the long-term average voltage is close to 50% of the supply voltage.how match time it take to gave a fixed 2.5 volt , how i can calculate it?
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