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Variable speed on a 5v brushless fan

Hi everyone! I have a 5v DC (0,15A, 50mm x 15mm) computer brushless fan that I want to power with a battery pack (4x AA rechargeables= 4,8v) or the MightyMinty Boost. This small blower is meant to be a part of a woodgas stove, and will bring air to the fire through a small duct. I'm looking for a circuit that would allow me to control the speed of the fan and the airflow. Kinda like a dimmer switch. Is there a readily available switch or devices that I could plug between the batteries and the fan? I guess the RC guys out there know a few thing about variable speed controller. I'm a newbie at this; I don't what to build a circuit from scratch, unless it's really simple. Thanks

Topic by jemor143    |  last reply


Best practical way of making biochar for soil improvement on commercial scale?

I need help to build a cost effective biochar retort that will produce at least 500 kg biochar/day to use for soil improvement on my dairy farm. It must also be moveable to move to new sites. I've got access to a lot of forestry waste all over the district. Here is my initial idea: From 3mm sheet metal manufacture cylinders (drums of say 200 lt) one bigger than the other so that one fits into the other with a 100 mm play all round. Bigger cylinder has a lid with a chimney on top and close ended at the bottom with air inlet holes around the base and completely isolated with fire proof material. Smaller cylinder (that goes inside) is open ended and stand on bigger cylinder baseplate with airtight lid that gets closed after filling with wood chips. It has 50mm outlet at the top that connects to a metal pipe (coming through the side of the outer cylinder) that leads woodgas to the bottom of the next retort and maybe have a drain to catch bio oil. The idea being that I can duplicate the retorts to increase production using woodgas from the previous to pyrolize the next. I then only have to burn wood in the first retort to get the process started. Please suggest improvements, or complete new more viable system. What can I use for isolation material? Can I collect other products off the woodgas instead of pyrolising the next batch?  What other byproducts might be valuable?

Question by HMST    |  last reply


(newsletter) Concrete LEGO, Bass Cannon, Cardboard Trebuchet...

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Topic by fungus amungus    |  last reply