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Engineering
Electrical Engineering
Fried my power supply by doing a bad thing
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[QUOTE="jrmichler, post: 6844176, member: 638574"] The only sparks were between the leads and the battery. No visible or odor of magic smoke. Photo of output board. The three bolts with nuts are the outputs, the brown and black wire pair is apparently the power to the outputs. [ATTACH type="full"]320637[/ATTACH] And a photo of the other end of that blue and brown wire pair: [ATTACH type="full"]320639[/ATTACH] Immediately to the left of the wire pair connection to the board is what looks like a diode. It has a gray stripe at the upper end, and a label on the board (not visible in photo) D19. That big heat sink on the right side background of the OP has four NJW0281G, which Digikey lists as [I]Bipolar (BJT) Transistor NPN 250 V 15 A 30MHz 150 W Through Hole TO-3P-3L[/I]. I took some ohmmeter readings. There are three output terminals. The black one is labeled - The green one labeled GND The red on labeled + Resistance from black to GND = OL in both directions (overload, infinite ohms) Resistance from red to GND = OL in both directions Resistance from black to red = 0.3 ohms in both directions Resistance from both black and red to accessible end of diode = 0.3 ohms in both directions. Both directions means that I switched the DMM probes. It looks like I should remove that circuit board and visually confirm that the diode is connected across the blue and brown wires. If so, it's fried. So what should the specifications of a replacement diode be if I cannot find a part number? [/QUOTE]
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Fried my power supply by doing a bad thing
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