I’m using a A1344 Hall effect switch to replace a reed switch in a homemade anemometer. The pulses are fed to the input of a LM2917 frequency to voltage converter. The sensor output is positive by default, but I need an output which only becomes positive when the magnet passes by.
is there another Hall sensor which does this?
Thanks

 

Sorry, the Hall sensor is A3144

 

Could add an inverter circuit to the output of the A3144.