![]() ![]() So if you need to repurpose something to get a psu, i highly recommend getting the hands on a broken ups unit with a working transformer. I really dont recommend rewinding the trafo, but thats an ultimate thing only if it really can be dealt with. I did rewinded mine, but not because of the voltage but because of the current which i needed larger as originally i made the supply for some other purpose (high current linear rf supply). Normally shouldnt need to rewind the transformer, best chances are it can be used right away. I use a regulated 30-40A source i did myself out of a UPS power unit, using its transformer and case. Necessity hopefully becomes the absentee parent of successfully invented children. Where I am sort left at is perhaps using some form of battery as a Smoothing/Reservoir capcitor. It is something i could do to get around to measuring at some point, except that I don t yet have a heated bed. So whilst the peak demands are quite high the average should be a bunch lower. We have spikes of high current loads (A lot at first as things heat up) followed by lower running currents. Thinking a little deeper about the nature of what we are powering:. They will need a large capacity for the currents encountered (risky arc welding potential) and this is likely to be expensive enough to reduce the cost advantage of the cheap supply. Adding Smoothing/Reservoir capacitors across the 12V line between PSU and Controler. ![]() But ultimately discarded this as a DIY option purley on the grounds that I need to sleep at night knowing I have sugested soemthign very risky to a wide ranging skills set.Ģ. Modifying the PSU to add capacitors across the rectified line voltage so that there is reduced ripple. ![]() Out of curiosity has anyone done some work on repurposeing these ?ġ. Their output is very poorly regulated as normaly they are operating loads that dont care.Ī feature of this is pronounced a 100/50Hz ripple as it is switching a rectified line signal. I have been looking recently at abundance of cheap switchmode PSU's aimed at 12V halogen lighting and wondering about repurposing them for RepRap use. ![]()
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