I have some fans that I want to monitor the RPM on... THe sensor I believe is called a HALL effect sensor. Where can I find them and some APP notes to use them...
Take a look at w*w.allegromicro.com and you will find all the information you need about monolithic hall effect sensors.If I recall correctly the sensor is called a HALL effect sensor. I found some of these but nothing that has an APP note I can look at.
If it is one of optical is easier but if it is for production a multipole magnet is very cheap and hall sensors are much more reliable in the long term than optical sensors.Or you must have multipole magnet which is not easy to achieve.Better solution is optical.