Hello!

I have a DC motor drive that takes in 0-12VDC control. The drive only operates at 3-12VDC in practice. I have a control that outputs 0-10VDC. How would I add a constant 2-3VDC offset to my control output?

I have tried making a simple voltage divider circuit with a potentiometer from a 24VDC power supply and placed that in series with the control output (0-10V) to try to get an input on the motor drive to 2-12V. Is this correct. When I did it I would only get 2-6V output to the drive.

Any help would be great. Thanks.

raptorjp

 

Hello,

Take a look at this page of the eBook : http://www.allaboutcircuits.com/vol_3/chpt_8/8.html

It goes about analog adders with an opamp.

Greetings,
Bertus

 

@Bertus

Thanks for your reply. I just thought there was an easier way to add voltages without using op-amps. I mean what if I added 2 1.5V AA batteries in series with my 0-10V output?

Thanks again.

raptorjp