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Total 27 documents matching your query.

1. [TenTec] Noise from Fans (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Thu, 6 Mar 2014 11:21:24 +0100; The noise of all fans is highly dependent on their speed and the relationship of speed to noise is not linear. It may be log rhythmic - I can't recall the exact relationship. But the racket goes up m; /archives//html/TenTec/2014-03/msg00085.html (10,918 bytes)
2. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Thu, 06 Mar 2014 18:02:36 -0500; Here is my solution - using very quiet computer fans. See the link at the bottom of the page: "Cooling Fan Project" http://k8jhr.com/project_links.html I sometimes use a small resistor to slow them d; /archives//html/TenTec/2014-03/msg00086.html (10,452 bytes)
3. Re: [TenTec] Noise from Fans (score: 1): Author: k6jek <k6jek@comcast.net>; Date: Thu, 6 Mar 2014 15:41:48 -0800; Nicely done. Not on Ten-Tec but on other gear I've built temperature controllers. Most of the time the fans run at a snail's pace and make essentially zero noise. They only pick up the pace when they; /archives//html/TenTec/2014-03/msg00087.html (11,577 bytes)
4. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Thu, 06 Mar 2014 18:56:36 -0500; Horizontal vs vertical fins... Hmmm.... that makes sense considering heat rises. Another great observation based on facts hiding in plain view. Of course he WOULD mention it AFTER you had completed y; /archives//html/TenTec/2014-03/msg00088.html (11,558 bytes)
5. Re: [TenTec] Noise from Fans (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Fri, 7 Mar 2014 08:51:08 +0100; That is very good. Try using diodes instead of a resistor. Use a string of 1N4004 or similar. Each diode drops a good half volt. You can even make it multi speed if you add a small switch. 73 - Rick,; /archives//html/TenTec/2014-03/msg00090.html (10,687 bytes)
6. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Fri, 07 Mar 2014 03:18:35 -0500; I made a fan built into my shelf system to help the amp vent hot air. I used an Off-On-Off switch with a single resistor to accomplish that feat. This gives me high and low speed with just a flick of; /archives//html/TenTec/2014-03/msg00091.html (10,311 bytes)
7. Re: [TenTec] Noise from Fans (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Fri, 7 Mar 2014 10:07:50 +0100; The resistor probably gets pretty hot. The diode string does not. Also, with a diode string, you can select more than one speed, if desired. At the end of the day, "poor cat"; loses its skin, one way; /archives//html/TenTec/2014-03/msg00092.html (11,098 bytes)
8. Re: [TenTec] Noise from Fans (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Fri, 7 Mar 2014 10:32:21 +0100; Jon, That horizontal vs. vertical fins only applied to when the heat sink is mounted on the back panel or sides of a box. Doesn't apply when it is top mounted (of course). This was one of the complai; /archives//html/TenTec/2014-03/msg00093.html (12,658 bytes)
9. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Fri, 07 Mar 2014 08:36:19 -0500; Thanks for the uptake, Rick. Ah, yes... Heat. I picked a really big resistor so I assume it is OK. I will have to check it. The guy who maintains our 17-site repeater system specified the value for m; /archives//html/TenTec/2014-03/msg00094.html (10,151 bytes)
10. Re: [TenTec] Noise from Fans (score: 1): Author: "Franklin Tucker" <frantuck@nac.net>; Date: Fri, 07 Mar 2014 08:52:09 -0500; Shouldn't that be an on-off-on switch? I made a fan built into my shelf system to help the amp vent hot air. I used an Off-On-Off switch with a single resistor to accomplish that feat. This gives me; /archives//html/TenTec/2014-03/msg00095.html (10,622 bytes)
11. Re: [TenTec] Noise from Fans (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Fri, 7 Mar 2014 07:51:31 -0600; Typically a silicon diode has about 0.7 volt drop per unit. Thus two diodes in series would drop 1.4V and three in series would drop 2.1 volts etc. The advantage of using a diode over using a R has t; /archives//html/TenTec/2014-03/msg00096.html (11,829 bytes)
12. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Fri, 07 Mar 2014 09:13:36 -0500; Ah... so the "plot sickens..." ;-) Thanks for that further gloss. I gotta learn more about diodes. A local Elmer told me to make a voltage divider (like an L-pad attenuator) if I wanted to assure a p; /archives//html/TenTec/2014-03/msg00097.html (11,324 bytes)
13. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Fri, 07 Mar 2014 09:15:30 -0500; ______________________________________________ DOH !!! Yes... you are correct...oops. I need more sleep and as my old logic professor used to shout, I must be more "rigorous!" Thanks for the help. --; /archives//html/TenTec/2014-03/msg00098.html (9,649 bytes)
14. Re: [TenTec] Noise from Fans (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Fri, 7 Mar 2014 18:16:19 +0100; A few diodes would be cheaper than lots of beer. You don't even have to calculate much. Just figure on 0.6v drop per resistor. I buy these diodes generally 100 at a time. They cost just a few pennies; /archives//html/TenTec/2014-03/msg00099.html (11,164 bytes)
15. Re: [TenTec] Noise from Fans (score: 1): Author: Bill Ny9h <ny9h@comcast.net>; Date: Fri, 7 Mar 2014 07:41:01 -0500; I use an import chopper dc to control speed on 4pabst fans in a box , in an enclosure behind the wall which fronts in a nice cabinet, with multiple 3" dryer hoses on multiple shelf levels, evacuating; /archives//html/TenTec/2014-03/msg00100.html (11,624 bytes)
16. Re: [TenTec] Noise from Fans (score: 1): Author: Mike Bryce <prosolar@sssnet.com>; Date: Fri, 7 Mar 2014 12:37:10 -0500; Guys, Ive designed a small circuit that will run the a dc fan at high speed for a dozen seconds then drop the speed down to as low as it will run. That way, the fan is sure to start, no matter how mu; /archives//html/TenTec/2014-03/msg00101.html (11,138 bytes)
17. Re: [TenTec] Noise from Fans (score: 1): Author: "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de>; Date: Fri, 7 Mar 2014 18:49:23 +0100; Careful Bill... If the IRS catches you dual venting like that, they'll find a way to tax it! And of course if you're a Republican, there'll be a surcharge on that tax. ;-) 73 - Rick, DJ0IP (Nr. Frank; /archives//html/TenTec/2014-03/msg00102.html (9,711 bytes)
18. Re: [TenTec] Noise from Fans (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Fri, 7 Mar 2014 11:55:37 -0600; Not only that but the EPA may be looking at you contributing to a trend of "global warming" with your methods. :-) 73 Bob, K4TAX Careful Bill... If the IRS catches you dual venting like that, they'll; /archives//html/TenTec/2014-03/msg00103.html (10,808 bytes)
19. Re: [TenTec] Noise from Fans (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Fri, 07 Mar 2014 15:04:59 -0500; And ... the SEC will tag both you and your accountant for understating the value of your assets. -- JHR -- ______________________________________________________ _____________________________________; /archives//html/TenTec/2014-03/msg00104.html (10,012 bytes)
20. Re: [TenTec] Noise from Fans (score: 1): Author: Bill NY9H <ny9h@arrl.net>; Date: Fri, 07 Mar 2014 15:24:15 -0500; how many fans / how many amps... are you limited to current capacity of the lm317 , or does that drive some of the transistors???? I've designed a small circuit that will run the a dc fan at high spe; /archives//html/TenTec/2014-03/msg00105.html (11,900 bytes)

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