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eHam Forums => Station Building => Topic started by: WB4LCA on March 02, 2008, 12:27:37 AM



Title: Thermo switch for transmitter cooling fans...
Post by: WB4LCA on March 02, 2008, 12:27:37 AM
Would like an approxamte 100*F surface mount thermo switch to activate .2amp 12vdc curcuit purpose being to add cooling fans to home brew repeater heat sink for on demand auxilliary cooling. I was told these were available at Radio Shack(cell phone city)?...I can't find them (or equivolent)??


Title: Thermo switch for transmitter cooling fans...
Post by: KE4DRN on March 03, 2008, 06:38:26 PM
hi b,

mouser.com stocks thermistors,
no min. order needed.

this circuit uses 1n4004 diodes
http://sound.westhost.com/project42.htm

73 james