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Originally Posted by DrMemory
Why did you use a Darlington pair driver IC. Did the hall effect device require that much gain?
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I follow Spiv guide
www.pc-workshop.net , thats the IC chip he used on his guide to monitor R.P.M. from 2 cable fans, I dont know to much about IC, I bet there is a easy to use a smaller simpler chip, but thats too complicated for a Mechanic like me.
I try to teach myself on this stuff searching on the net , I found diferent ways to monitor R.P.M, here I will give you some of the links:
http://www.pc-workshop.net/articles/...mmonitor.shtml
http://tipperlinne.com/fan-tach
http://www.allegromicro.com/sf/3141/