I have never tried it, but in theory it might work, if he had a 0-10v PWM and connected the output to a voltage divider, it should divide the voltage and the duty cycle should remain the same. since the width of the pulse determines the voltage where 10% = 1v and 100% = 10v with an amplitude of 10v then 10% = .5v and 100% = 5v if the amplitude is divided in half. of course load is a factor so some experimentation with resistor values would be required, i would start with 10k half watts and see what happens
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