Re: BA23 fan noise

2016-02-01 Thread Steven M Jones
On 02/01/2016 08:22, Warner Losh wrote: > [...] All you can do about that is to get a smaller fan that can turn more > slowly. If you couldn't tell from the rest of his post, Warner meant "get a larger fan," not "smaller." This is why main PC case fans can now be had in excess of 5" / 12cm. The

Re: BA23 fan noise

2016-02-01 Thread Warner Losh
In general with fans, there's two things that make them loud. 1 is the size. All you can do about that is to get a smaller fan that can turn more slowly. 2nd is some kind of lube problem. Sometimes you can fix these with proper lubrication. Others, you have to replace the fan. You really want to m

Re: BA23 fan noise

2016-01-31 Thread Jon Elson
On 01/31/2016 08:42 PM, Mark G. Thomas wrote: Does anyone have any suggestions for figuring out how much airflow I actually need, and achieving it with either stock fans at further reduced voltage, or some kind of replacements? I don't need an accurate solution, or something with complicated comp

BA23 fan noise

2016-01-31 Thread Mark G. Thomas
Hi, I've been messing around with my PDP11/83 and a Microvax, both in BA23 boxes here. These fans make too much noise for my home office area, and I cannot possibly need the original airflow. Even with the internal jumper set for 10V to power the 12V rated fan motor, these are still noisy. It's