I had 13 replies from people wanting to build my fan controller for the MFJ power supply, but unfortunately I only had enough spare parts for four units.
Fortunately, the parts are easy to get (Digi-Key part numbers are listed on the web page listed in my original message, copied below). The PC boards are available for $4.00 plus S&H from FAR Circuits, or will be as seen as I send the film artwork back to Fred KF9GX, owner of FAR Circuits. http://www.farcircuits.net/ Refer to the "BLOOM FAN CONTROL BOARD". Thanks to everyone for their interest. Al N1AL > The MFJ-4125 "PowerLite" power supply is a great little unit for the price > (around $100). It puts out 13.7V at 25A in a small, light package that is > perfect for portable operation with the K3 or K2. Unlike some other > switching supplies, it has very low electrical noise. > > Unfortunately the same can't be said for acoustic noise. The loud fan is > the one thing people complain about. So I designed a fan controller that > reduces the fan voltage for normal operation while running it at full > speed when the internal heat sink warms up. I've posted an article on my > web page: > http://www.cds1.net/~n1al/ham/fan_controller.htm > > I have enough parts left over to build 4 more units. If anyone is > interested I can supply a kit of parts for $5 postpaid/USA that includes > the clamp and all electrical parts except for the TIP-29 power transistor. > (I'll throw in a TIP-31 from my junk box that that should work the same, > or you can obtain the exact part yourself.) I also have a couple PC > boards left over that I'll include while they last. Email me if you're > interested: [email protected] . > > Al N1AL > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
