> Typical H-bridge protection uses 4 diodes: > M1 to V+ > M1 to V- > M2 to V+ > M2 to V- The SN754410 appears to have the full complement of internal diodes, but perhaps they aren't good enough. For example half-H drivers like the L293 must have external UF diodes for protection Joe --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .