The Digital Motor Drive uses a regulated DC power supply powering a microprocessor, employing crystal-controlled adjustable dual oscillators for sine and cosine drive (true 90-degree phase shift). The low distortion precision sine wave dual oscillators drive two high power low distortion amplifiers that power the motor windings. This allows absolute total isolation from the power line. Speed sweep is plus or minus 2 percent. The turntable speed is checked with an onboard strobe light driven by a short pulse crystal - controlled square wave oscillator. Speed accuracy is three parts per million. Touch button logic control is employed. (On-Off and Speed Select) The Digital Motor Drive System is the most advanced drive system available.