Carl: Another option is to build the thermostatic fan control circuit that I published in the Summer, 1992, issue of Communications Quarterly (this article is available on-line at J M Cherry's Virtual Drake Museum under the "what's new" tab). My fan control circuit mounts in place of the fan socket on the back of the TR-7. While I haven't seen the TR-5, I suspect that the fan socket is the same, so this board should easily fit. My modification can be used to turn on any DC fan when the PA heatsink reaches a temperature that you define.
Scott N7NB _____ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, February 11, 2009 9:11 AM To: [email protected] Subject: [Drakelist] cooling fan noise Hello to the group, Am working with my TR 5. Initially used a R.S. fan but was way to noisy. Read the archives. Evan K9SQG said he used 220 V. ...soo A Boxer 230 V. with ball bearings "Pewee" starts and runs fine. Still to noisy. Made neoprene washers for the metal to metal mount...no help. I tried closed cell foam pads under the chassis feet...no help. NOTED that in open air on a dining room table that it was quiet when sitting on a bamboo placemat. I am using on a desk top, with a shelf for other equipment about 6 inchs up..... Echo chamber no..because if I lift it up... QUIET Anyone with any thoughts ? Carl Hibbard WD8NHK _____ Nothing says I love you like flowers! <http://yellowpages.aol.com/search?query=florist&ncid=emlcntusyelp00000001> Find a florist near you now.
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