i took a 24V 7.5A power supply and added a variable ac "autoformer"...this allows me to vary the ac voltage going in as input to the power supply, thus giving me a 0-24V unit...the good thing is that this can me used in a variety of applications...the bad thing is that it's very crude...I had to build the thing, so it looks kind of bulky...and my wife gets a fearful look when I turn it on,heh
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