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The ST-OSC2B is a miniature wall and surface mount dual audio oscillator from RDL. The module provides separate left and right audio signals for each of two frequencies - 100Hz and 400Hz, and may be used in conjunction with the ST-OSC2A to provide a complete set of frequency response test tones, or in systems where 400Hz is used as the reference frequency.
Dual, amplitude-stable oscillators provide precision sine-wave audio signals at 100Hz and 400Hz