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Several weeks ago I purchased a couple of Modules that were advertised as able to provide 1 Hz to 150 kHz signal with a 0% to 100% duty cycle control.     The modules were able to be powered with 3 volts to 30 volts and would output a signal of this same magnitude. The output was rated at 5mA to 30mA depending on the supply voltage. The accuracy of the device at 2% for the Frequency and 1% for the Duty Cycle is acceptable for the type of experiments that I do in my lab.   ...