FAN SWITCH...I use Airpax Series 6700. http://www.airpaxtsp.com/tspsite/6700.html. They are available in a number of temperature settings. Size TO220 package. I drive a 12 volt relay with mine, then I can control anything with relay contacts.  Not bad price $6.85 each. Part No 67F040 (40 deg C). You might want a little higher trip point. Purchased from Sager Electronics, Middleboro, Ma <508 947-8888>. Am presently installing one on the inside of the heatsink in a Moto Micor Mobile repeater, near the power output transistors. Also try Jim Breuer at Airpax Corp in Frederick, Md phone 240-379-1346 or www.airpax.net.  I also install them in Astron supplies. Mount it inside the Astron between the two power transistors on heatsink. I use the screw that holds the standoff for the equalizing resistors. One on each side. So if things get too hot it gives switch closure, relay will turn on fans. 
Gary K2UQ
 








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