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DDS Signal Generator with Schumann Resonator, Portable Multifunction Waveform Generator with AC\/DC Power, Ideal for Oscilloscope Calibration, Audio Testing, and Stress Relief\u003c\/h3\u003e\r\n\u003cp id=\"b\"\u003e\u003c\/p\u003e \r\n\r\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\r\n \u003cul class=\"a\"\u003e\r\n \u003cli\u003e1Hz-500kHz DDS signal generator with Schumann resonator: Combines the functions of a high-frequency signal generator and a 7.83Hz Schumann resonator to provide electronic circuit testing with stress-relieving benefits, setting it apart from standard models.\u003c\/li\u003e\r\n \u003cli\u003eVersatile waveform generation: Produces sine, square, triangle, and sawtooth waveforms. Includes a switchable filter for precise sine and pulse outputs, perfect for oscilloscope calibration and testing audio amplifiers.\u003c\/li\u003e\r\n \u003cli\u003eDual power options: Compact and portable, powered via AC\/DC adapter or external battery pack (not built-in), suitable for classrooms, labs, or field testing\u003c\/li\u003e\r\n \u003cli\u003eComplete package with Schumann resonator: The included Schumann resonator enhances mental relaxation while offering reliable performance for engineers and audiophiles alike.\u003c\/li\u003e\r\n \u003cli\u003eHigh accuracy \u0026amp; stability: Built with quality pulse chips, accurate resistors, and correction capacitance for stable frequency generation\u003c\/li\u003e\r\n \u003c\/ul\u003e"}