After visiting this web site for several years and scouring the Internet and electronic books for circuits, I am about to start putting together the design for a poor man's DC powered RPM display for a wind turbine.
To help me with resistor and capacitor calculations it would be handy if readers could contribute facts or inspired guesses as to the RPM of their wind turbines until - or at - the furling point. If anyone has real RPM figures for runaway mills please let me know.
My circuit ideas are based on LED or LCD displays with commonly available IC's etc, but I am not touching programmable IC's for the moment. Nor am I forking out cash for hold in the hand RPM sensors which are available on the market.
I am aware of sniffing the AC component from wind turbines and working out the Hz readings from multimeters,but the aim is to have something that can be used for 'learning and setting-up purposes' even if it involves umbilical links down the 'pole'.
As far as sensors are concerned, I am using as many as I can for experimental purposes i.e. reed, slotted opto, proximity sensors etc.
I look forward to useful replies.
David HK