Temp Fan Controller

One day I found a need for a automatic temp controller for my ham radios and my repeater power amplifiers because of the heat that can build up due to long key downs. With long key downs over time can destroy equipment so I looked on the internet to see what was available.   I really wanted something simple and cost affective which I never found and gave up so I came up with the great idea to design a controller.

The PDF  file below has the blown up version of what I came up with.  The fan controller has work out very well which hasn't had any problems and nor failed ..

I may come up with a workable board for sale ...  check back here for more information ... 

If you are interested in a controller let me know  via e-mail take out first and last letter before the @ symbol

 Download the pdf file FAN COOLING CONTROLLER