SMALL - SMALL - Telemetry SMALL - Radio
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Old Dec 21, 2002, 10:56 AM
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norbique's Avatar
United States, HI, Honolulu
Joined Dec 2002
350 Posts
Simple one-way Speed Controller - Updated!


I present you a simple analog yet powerful (up to 40A constant current) one-way speed controller built up with power MOS FETs. It is quite easy to build, and uses cheap components.

The drawback of this controller is that it has no BEC and you must add extra batteries for the receiver and the servos. Or in case your receiver supports higher input voltages up to 8.4 volts you can use the same batteries that the motor uses.
The positive thing is that the 4N25 optocoupler used in the device separates the Controller from the receiver, this way protecting it from possible malfunctions of the controller, e.g.. If the MOS FETs die.

The input operating voltage of the device goes from 7.2 to 19.2 Volts, from 6 to 16 cells.

As it is too hard to translate the theory the controller works (as the original text is written in Hungarian) I rather present you the schematic diagram, the parts layout, the PCB layout, the parts list and provide you with some useful information.

please follow the link below:

Merry Christmas to Everyone!
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Last edited by norbique; Dec 24, 2002 at 09:22 AM.
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Old Dec 22, 2002, 05:24 PM
Baptised Heathen
batman's Avatar
Bundaberg, Qld, Australia
Joined Jun 2002
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Unfortunately the schematics, pcb layout and parts list won't show, at least not on my computer. Can you post them in another format?
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Old Dec 22, 2002, 10:26 PM
Demon-Leather's Avatar
Rex, NC "Extreme Boonies"
Joined Jan 2002
2,360 Posts
Doesn't on Mine Either...

I hope You re-post them,.. I'm VERY interested! I'm presently trying to repair one of mine now. If it looks like I can solder the replacement FET in, I'd love trying to build My own Speed controller! Bob
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Old Dec 22, 2002, 10:43 PM
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buckeyes1997's Avatar
columbus, oh, usa
Joined Jun 2001
426 Posts
to see them

you can easily see them by right clicking on the spot where the image is supposed to be and then goto properties. copy and paste the link into a new webpage and there ya go.

the pics are at this address simply paste them to new page.
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Old Dec 23, 2002, 02:46 AM
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norbique's Avatar
United States, HI, Honolulu
Joined Dec 2002
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I'll try to solve the problem...

Yes unfortunatelly I have also experienced that the images don't show, but have no idea why.

I was working on a small presentation yesterday , instead of these not-showing pictures and and I'll put it online very soon.

I'll let you know when it's ready, and give you the link.

Thank you for your interest and patience.
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Old Dec 23, 2002, 02:57 AM
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norbique's Avatar
United States, HI, Honolulu
Joined Dec 2002
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Speed Controller Online


Here's the link I promised:

Good Luck!
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