The AO-1 Audio Oscillator features either sine wave or square wave output, with audio frequency coverage of 20 CPS to 20,000 CPS in three ranges. Thermistor regulation is provided for linear output throughout the frequency range. AF output is at low impedance, with low distortion. Good sine waves, and clean square waves with a rise time of only 2 microseconds are available to be used in a great variety of applications. Output voltage is 10 volts no-load, ± 1 db. Distortion is less than 0.6% from 100 CPS through the audible range. Cabinet measures 7½"H. x 13¼" W. x 7½" D. A very valuable instrument for audio experimentation and development work. Shipping Weight: 10 lbs.