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From: Gary Tait
Subject: Re: Want to make a RPM Counter off a DC Fan.
X-Newsreader: Forte Free Agent 1.92/32.572
Date: Tue, 15 Oct 2002 11:25:27 -0400
NNTP-Posting-Date: Tue, 15 Oct 2002 11:25:24 EDT
Organization: WorldCom Canada Ltd. News Reader Service
On 15 Oct 2002 05:00:00 -0700, firstname.lastname@example.org (devoed) wrote:
>Ok I am totally new to all this but I am really wanting to learn. I
>don't really know where to start but I have a project I want to do.
>Can anyone point me in the right direction? What I am wanting to do
>is design a circuit that will power a DC fan and also use the 3rd wire
>from the fan(Tach) and convert that to RPM on a small LCD. Any help
>will be greatly appriciated. Thanks for all your time and effort.
What sort of fan? For the DC brushless muffin fans commonly used
in PCs, it is as simple as installing a diode and a resitor to one of
the coil drive outputs, with the cathode going to the motor.
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