RE: [Repeater-Builder] Muffin Fan speed

[Eric Lemmon]

John,   Digi-Key and Mouser list both AC and DC fans in many different speeds, capacities, and sizes.  I found a replacement fan for a Hewlett-Packard signal generator that was form, fit, and function identical to the original fan- except that the new fan was barely audible.  The original fan was a screamer.  The careful design of modern muffin-style fans allows them to move the same amount of air with much less noise.  Check the dB ratings before you buy.   73, Eric Lemmon WB6FLY From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of John J. Riddell Sent: Sunday, January 08, 2006 4:20 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Muffin Fan speed Here's an old idea, that may be worth repeating:   If you want to run a muffin fan at a slower speed, to reduce noise and of course lower the air throughput, put a paper capacitor in series with one side of the AC supply.   Recently, my Son-in-Law wanted to cool his stereo amp and I used a 2 Mfd 200 volt paper capacitor to slow the fan down. This value resulted in about 62 volts feeding the fan and it run's just fine at that voltage.   Other capacitor values will result in different voltages which will create different speed's of the fan       John J. Riddell,  VE3AMZ 451 Cedarcliffe Dr., Waterloo, Ontario, Canada N2K 2J1 YAHOO! GROUPS LINKS  Visit your group "Repeater-Builder" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.