MFA-919D2PR-Panel-Mounted-Bi-Directional-Variable-Speed-Regulator-MFA-919D2PR-p-A-panel-mounted-speed-regulator-that-features-a-constantly-variable-bi-directional-output-These-units-are-designed-to-be-used-with-miniature-and-sub-miniature-motors-and-are-suitable-for-a-range-of-applications-The-motor-can-be-powered-from-a-DC-source-either-battery-or-transformer-recitifier-transformer-rectifier-must-have-a-non-digital-output-PWM-circuitry-is-employed-which-varies-the-output-pulse-width