They are mainly RC related but some of their knowledge is right up there. They originally pushed the boundaries on batteries and charging because everything is power to weigh ratio in airplanes.
They have a separate section on designing and building motors and drives and one for batteries and charging. They also have gone far with motor controls, I doubt brushless DC motors or sensorless drives would be as popular in industry without work done in the RC society. They have also gone to great lengths in miniaturization and in using microcontrollers.
Much of the motor and control information they have can be directly related to someone wanting to build an electric bike for example.
Might not be strictly an electronic forum but different fields may end up as an unlikely resource when you are trying to solve a problem. I never would have thought there would have been a forum on flashlights.
I am not really interested in a high count value of a forum, just as long as it has the information i am looking for. The reason I am on this forum is because my brother needed some information on high current power supplies and the car guys here fit the bill.
Like you said, rather than searching through links hoping to find a good site it would be nice to have a place where others have already gone through the trouble.
Now not really electronic in nature but might be of interest to people of this forum is the AV forum
Home Cinema Construction & Configuration - AVForums.com
They have some good information on building media rooms and soundproofing. Hope you do not mind my suggesting it. I will look up my links for more electronic related sites later.
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Best non-audio (general) DIY electronics forums and message boards
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