XY-PWM Square Wave Signal Generator DC 3.3-30V 1Hz-150kHz PWM Pulse Frequency Duty Cycle Adjustable Motor Controller Regulator

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50Hz-6KHz 0.8Hz-60Hz Adjustable Square Wave Pulse Generator Oscillator Module Output Signal Source Frequency 200mA DC 5-15V

7.83HZ Schumann Wave Generator Adjustable 0.1HZ~30KHZ Pure Sine Frequency Modulation Signal Generator Audio Resonator

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VC71B Signal Generator 4-20ma Current Voltage Analog Signal Source Handheld Process Calibrator Voltage Current Signal Generator

DC 5V Adjustable 0.001HZ-200KHz 7.83HZ Schumann Resonance Ultra-low Frequency Pulse wave Generator Audio Resonator Sine Wave