Comparator needed as a zero-crossing detector.
In the beginning was the circuit 1. Comparator never switched.
Then I did the circuit 2. Comparator works, at the 3 input of the comparator is Um = 50mV. Watched broadband oscilloscope.
The generator should have the load 10 kohm±20%. Otherwise, not required frequency stability is guaranteed! The output signal (sine wave) is symmetric with respect to zero (the output is connected through a capacitor, which is inside the generator). The signal amplitude of generator is 0.5 V.
Question: How do I estimate the value of the generator load ?
TIA
Vladimir Naumenkov www.agat.by
