[App_rpt-users] URI's I/O fan control

[Randy Hammock]

On Apr 1, 2009, at 6:33 PM, Will Wright wrote:

> Hello to the group,
>
> I wonder if anyone would like to share a timing circuit and it's
> programming use with one of the URI I/O pins, lets say to control a  
> fan
> to keep the transmitter cool on transmit and off when not in transmit.
> Thanks

I prefer mounting a thermal switch on the heat sink of the  
transmitter. This way, the fan is controlled by real need, not some  
imagined arbitrary need. When the ambient temp is cool, the fan runs  
very little. When the ambient temp is elevated, the fan runs longer.  
But the transmitter stays a comfortable temp.

--
Randy Hammock KC6HUR
http://kc6hur.net/~rhammock/
http://irlp.kc6hur.net/
If there are no horses in heaven, then when I die, I want to go where  
they went.