http://www.kelinginc.net/SwitchingPowerSupply.html Model KL-7220
This is what I bought.
I ride the short bus when it comes to electronics, I'm afraid . . and while I can sort of reason out what an 'over wind' is (a tap basically?), the term 'toroidal transformer' is alien speak.
![Huh ???](https://www.machsupport.com/forum/Smileys/default/huh.gif)
Yes, I know now that switching power suppies are not only unnessesary, but not recommended by Gecko. I suspect they may also cause a lot of noise, but that's just speculation.
If the new transistors fix the 36v supply that I have now, I could use that to power the little servo for the time being.
Eventually, I will probably replace the little servo with a larger NEMA34 90v ort 72v servo, but meanwhile, there must ne some way to get 36V from a 72V transformer easily. I have ordered a pair of 9.1ohm 100watt resistors. I read that a 'voltage reduction' circuit uses a resistor on both the positive and negative wires and I have also read that the resistor goes only on the + wire, I have no idea which is better or why. Seems to me a DC motor swithces polarity depending on the direction, so there is no '+' wire in reality. Is that correct?
I would like some more explaination as to why the voltage drop across a resistor based on current draw is going to pose a problem. I have a little better understanding of the difference between 'switching' and 'unregulated' now, and my understanding is that 'unregulated' supplies do not compensate and the voltage drops when the draw goes up. Gecko recommends 'unregulated' supplies, so I presume they must be designed to handle the voltage drop.
So I don't understand why a votage drop on a . . 36v 'tap' would be a problem for the servo motor if I put the resistor upstream of the Gecko. What am I missing?
http://www.kelinginc.net/K23-120-36.pdfThis is the little servo motor. Quite the little brute actally. If a resistor was sized to give 36V @ 4A and the voltage was geater at less draw and fell off over 4A, what would the result be in performance and would it damage the motor? I'm fairly certain it would not bother the Gecko drive. The drive is rated for 80V and and it has an adjustent to limit output current anywhere between 0 and 20A.