On 18 March 2012 19:00, Kirk Wallace <kwall...@wallacecompany.com> wrote:
> These look pretty handy: > http://www.pololu.com/catalog/product/1187 > > I'm thinking about ways to add load sensing for drives that don't have > this feature yet. Also, I wonder if they are fast enough for PWM signal > control? > > Digikey has some other models of these sensors but it seems for my > purposes, the working voltage isn't high enough, or the current range > is too wide and some resolution is lost. > > Current can also be measured with an opamp measuring voltage across a > current sense resistor, but I'm worried about a common mode voltage in > the hundreds of Volts. Is there away to handle this? > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/<https://lists.sourceforge.net/lists/listinfo/emc-users> You could make your own with an optocoupler and a few parts. I had a quick bash at circuitlab and pasted it it at fotothing. All part values are bull. It's just to paint a picture. http://www.fotothing.com/editphoto.php?id=a08a3b3edcfafe2c72ba4d0d78b4bce2 Regards Roland ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
