The other solution is to fix the PWM circuit so it has a linear PWM/voltage transfer function. This is not difficult (even 12 bit linearity is possible with little fussyness), it requires:
1. Good low delay isolators (and low delay in all PWM signal path) so PWM width is not distorted 2. Symmetrical drive to the RC (looks like the C41 falls down here = drive output low has lower impedance) 3. If you want to get fancy , add a multipole filter and a rail/rail output OP amp Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. A cloud service to automate IT design, transition and operations 2. Dashboards that offer high-level views of enterprise services 3. A single system of record for all IT processes http://p.sf.net/sfu/servicenow-d2d-j _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
