NEMA, the National Electrical Manufacturers Association, Rosslyn, Va., recently released ICS 19-2002, Industrial Controls and Systems: Diagrams, Device Designations, and Symbols. According to Richard ...
I was planning to use the opto-coupler speed sensor as part of a motor speed control – making the motor into the VCO block in a phase-locked loop. When this technique works, using it is simple: put ...