title: Magnetic stirrer with no external moving parts.
abstract: This note describes a variable speed stirrer which is based upon a rotating magnetic field produced electronically. Digital circuitry is used to generate two stepped functions which approximate sine waves differing in phase by 90 degrees . The signals are amplified to drive sets of perpendicular coils such that a magnet situated between the coils rotates at the chosen speed.
authors.affiliation: Department of Chemistry, Rice University, Houston, TX 77001, USA.
authors.forename: P S
authors.initials: PS
authors.lastname: Engel