WARNING
There are very high, lethal, voltages (over 300V) generated within the power supply which maybe present even if the mains power is disconnected.
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Humax PW808 Power Supply, High voltage end. When I traced the circuit of the power supply I couldn't see all of the components from all sides so I could not always determine their values by reading them off. Some of the resistors were clear but those that were not I put my multi-meter across. So, some of the resistors have standard looking values and some, those which I couldn't see, sometimes have odd looking values but this is the best guess. Similarly, some of the capacitors are shown with values if I could see them but others only have their circuit designation. From the circuit diagram it's clear that the snubber circuitry is protecting the STR-W6252D PWM switching regulator's power MOSFET. However, according to the datasheet, the drain-to-source breakdown voltage for the MOSFET is 650V minimum. So, fingers crossed, it might have survived. |
![]() Hummy PW808 HV |
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Humax PW808 Power Supply, Low voltage end. It was much easier to see the values of the components in the low voltage end of the power supply than it was when I did with the high voltage end. |
![]() Hummy PW808 LV |