A rotating instrument is outputting AC sinusoidal wave where both the frequency and amplitude of the output is proportional with the rotation speed. This output then goes to a converter box, which converts the sinusoidal signals to pulses.
I opened the circuit case and saw the following opAmp is used: MCP06 I noticed that our old signal conditioning box which does the similar job cannot function at very low rotational speeds. Which means the opAmp in our circuit is not somehow triggering at low voltages. The min/max amplitude of the sinusoidal signal is from around 10mV to around 150mV. It seems to me that for very low sinusoidal signals with amplitudes around 10mV or up to 50mV our conditioner does not function. But the new converter with MCP607 works fine.
Why do you think this opAmp is used for this purpose?
Cant one make a comparator/schmitt trigger and set the limits of triggering with any opAmp?