Hey, I'm having a problem with a servo in my system.
I'm using a Controllino MAXI, and I've been using the 5V output to power a servo in the system. The output works fine and I've had no problems for months.
Now I need to duplicate the servo (X5), so I got a Vox power supply (NEVO+600M), because I don't want to fry my Controllino with too high an output current.
Since my power supply is 7.5V, I used a voltage divider to get 5V. I used a Fluke to see that my circuit is correct, and it is. The voltage is within the required range.
Now, when I connect the servo the voltage jumps to ~2V. I checked and this drop doesn't happen when the servo is connected to the onboard Controllino 5V supply.
And of course, the servo doesn't work with the voltage divider configuration.
Does anyone have any idea how to solve this?
Your circuit diagram shows the PWM signal at a level of 1V, which is odd. It also shows that signal is common with power to the servo, which makes no sense. Can you draw something (pencil will do) that shows how the three servo wires are actually connected?
You can use a 7805 voltage regulator chip to get 5v. You can add a diode to the chip base lead to get 5.7v out. You might also get a 6v UBEC on ebay to regulate the voltage.
Voltage dividers never work if any real current is required from them because the extra current comes through the top resistor and causes extra volt drop reducing the output voltage to almost nothing.
If your servos are all MG995s then just add a power diode in series with the power supply. That will reduce the voltage to about 6.5V and they will comfortably run on that. In fact they would almost certainly run on 7.5V with no problems but that is pushing your luck slightly.
