The TL Series consists of two models, 251TL and 351TL, both using linear technology. These units are ideal sources for special purpose AC power applications that require variable voltage and frequency at high frequencies and low noise and distortion levels. Both units provide single-phase output. With simple knobs used to set voltage, frequency and current limit, the TL Series provides an inexpensive source of low AC power. All TL Series power source models can be used in table-top mode or rack-mounted.