I'm trying to design a digital to analogue converter and voltage controller for a DC motor to be driven by an arduino (pictured below). For the D to A converter (summing amp) I'm using a 741 op-amp, the issue is I can only use a 6V battery for the VCC rail voltages on the op amp. However, the arduino supplies 5v per output and I have 6 outputs from the arduino, hence if more than one output is used the op amp saturates/doesn't work how I want it to. I tried adding a voltage divider to reduce the signal voltage into the positive terminal of the op amp however it still saturates. Does anyone have any hints to help me get over this issue. I can only use the equipment I have quoted.
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