David, Nothing is simpler than a thermal switch. I bought a #317-1094-ND thermoswitch from Digi-Key that closes at 50 degrees C (122 degrees F) that fills the bill perfectly, for just $9. I drilled and tapped two holes on one of the radio's heat sink fins, and mounted the switch with a dab of heat-sink compound under it to ensure good heat flow. During heavy usage of the repeater, the muffin fan runs for a few minutes- but only when needed.
73, Eric Lemmon WB6FLY drwoolweaver wrote: > > I need a simple circuit for a repeater PA fan controller with delay time > out... Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
