On 05.10.19 15:20, John Dammeyer wrote: > > > > I�m using PWM with a direct signal and enable. My drive accepts 0-10V, > > so I > > created a little board that converts the PWN to a 0-10V analog signal and > > isolates all the signals. > > > > N. Christopher Perry > > That's basically what I've drawn out too but I found the op-amp > couldn't pull to ground and I wanted exactly 0V output. A pull-down > on the output before the RC and using the ACPL-P480 Andy suggested > looks interesting since it does have active pull-up and pull-down but > without a bleed resistor I'm still not sure I can reach 0V.
If you're driving a modest load, then the pull-down should do it. If a bit more oomph is needed, then an emitter follower on the op-amp output, with a significantly lower value pull-down is a quick fix. Op-amp feedback is then from the new output. Beyond that, you're up for a negative rail for the op-amp so that it can easily reach 0v. Erik _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
