Hi Jai!

On Sun, 9 Mar 2003, Jai Dhar wrote:

> Sorry to resurrect this thread, but I finally got a hold of some IRLZ24's, and
> decided to try out a little electronic switch with a fan. I basically have the
> output of a FF connected to the gate of the mosfet through a resistor, which
> then has a fan going across it. When the fF output is on, the gate see's +5V,
> which is well above the threshold, but the source only gets about +3V. I tried
> removing the FF and just applying +5V directly to the gate, and same results.
> But when I apply +12V to the gate, the fan turns on fully and source gets
> +12V. Am I doing something wrong? (I have attached schematic)

Here're a couple of informative links.

In all these inductive/resistive examples see the diode across load.
Strongly recommended to protect the controlling device.

PIC temp sensors for PC fan control:
http://liquid-nexus.net/fanctrl/schematics.htm

Simple MOSFET circuits:
http://www.uoguelph.ca/~antoon/gadgets/mostest.htm

This one's a blast with tons of intros on almost any topic:
http://www.web-ee.com/primers/primer_bottom.htm

More theory on many semi topics:
http://www.americanmicrosemi.com/tutorials.htm

Have a :) day!

jb

--
jim barchuk
jb@jbarchuk.com

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