30 Aug '13, 6pm

New post: Cooling fan speed controllers do it by generating heat

New post: Cooling fan speed controllers do it by generating heat

We’ve never torn one apart ourselves, but it boggles the mind just a little bit to learn that these cooling fan controllers generate heat to do their job . We’d bet we’ll get shouted down in the comments, but doesn’t this seem counter-productive? At any rate, we enjoyed reading two posts on this topic. [Göran's] first adventure with the hardware started when he was trying to design his own speed controller. He saw a reference design in the LM7805 linear regulator datasheet which allows the adjustment of the output by changing the ground reference. When fed with 12V this ends up putting off some heat but it is a simple and reliable solution. He was a bit surprised to crack open a Zalman module and find the exact same circuit inside. The controller in the background is an eBay purchase. He cracked that one open as well (that’s the link at the top) and found a circuit with a ...

Full article: http://hackaday.com/2013/08/30/cooling-fan-speed-controll...

Tweets

And last week's blog (forgot to send link) - on...

buildinggreen.com 30 Aug '13, 7pm

A new generation of CO2 -based heat pumps could avoid the high global warming potential of standard refrigerants and gener...

Don’t diss dung beetles — they’re cooling the planet

Don’t diss dung beetles — they’re cooling the p...

grist.org 30 Aug '13, 1pm

Arthur Chapman You let those f&$king dung beetles do their thing, OK? You know how everyone freaks out about the methane i...

Following Google's New Mobile Speed Guidelines with the PageSpeed Insights Tool

Following Google's New Mobile Speed Guidelines ...

seop.com 31 Aug '13, 4pm

Following Google’s New Mobile Speed Guidelines with the PageSpeed Insights Tool August 12, 2013 by SEOP Blog Team Image by...

Pingdom Website Speed Test

tools.pingdom.com 01 Sep '13, 11am

We built this Full Page Test tool to help you analyze the load speed of your websites and learn how to make them faster. I...