Most PSUs will work fine without external loads either because their design is (at least theoretically) immune to those problems such as DC-DC secondary outputs and others deal with the problem by adding circuitry or resistors to provide the minimum loading required for "no-load" operation. insufficient load on the primary regulator output causing the PWM's duty cycle to be too low to provide sufficient power to secondary outputs, causing secondary output voltages to drop until under-voltage protection trips stray inductance increasing under-loaded secondary outputs to rise until over-voltage protections trip because the load drains less power than what is being provided by the HV transformer's stray inductance There are at least two ways for under-load to cause problems in bulk-regulated PSUs: ![]() I have not found any document that completely matches this transformer's wiring code. Can anyone provide that, please What I'm listing is what I THINK is right but I request confirmation. I have not yet found the color code chart for it. They do not have "jumping protection" but some PSUs may fail to work properly if their minimum load requirement on one of the rails is not met. 1 I've got a good condition T4145 that I intend to run in this 1970 Super Lead I'm restoring. ![]() But is it correct that some new PSUs have a failsafe to prevent jumping ?
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