XR2206 datasheet in PDF, the Exar monolithic function generator IC widely used in kit signal generators for sine, square, triangle and ramp outputs. It describes pin assignments, timing capacitor and resistor selection, amplitude and frequency modulation inputs, sine shaping adjustments and supply limits. Technicians rely on it to trace a faulty generator stage, check the timing network and supply voltage, and adjust symmetry and distortion trimmers properly; verify the marking on the chip, since clones of this part are common.
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