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Originally Posted by |kbn|
the pcb in the bottom pic can stay, assuming I want to keep Y wiring. To change to delta, I would just cut some of the traces and add solder connections to the correct points. I assume if I were to by a similar RC speed controller as used above it would fit in perfectly.. the only think I dont know is the control side of it.. since I assume it connects to an RC reciver of some kind.
Your correct laing did say it was fixed by smoothing the square wave, however I think this is just later d4 versions..? The d5 has the two pcb's intergrated into one, I think they just compleatly redesigned it. Probably at a higher frequency and the modified sine wave was just a quick fix..
I also notice that with the pcb removed, and case cut down, the D4 could be amost as compact as the DDC.
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The first paragraph seem to be pretty much right in my understand of how it all works . there is one strange thing though the coils only need 3 wires in order to work, were as your pictures shows 4 going to the bottom PCB . im not sure how this will affect your ability to use the bottom PCB with out removing it ... My D5 had a double sided PCB im guessing the D4 will be the same. this may make it difficult to rewire it with out removing the PCB from the housing and coils.
As for this "I assume if I were to by a similar RC speed controller as used above it would fit in perfectly.. the only think I dont know is the control side of it.. since I assume it connects to an RC reciver of some kind."
in the pics i have a SERVO TESTER " the variable resister". This acts as a receiver but with out receiving anything and therefore is required for the whole system to work