| Electronics > Projects, Designs, and Technical Stuff |
| I have a short ( i think) and don't know where to start |
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| Hextejas:
I am building this power supply and so far I have exploded 8 diodes, mur860. I tried narrowing it down but I am stumped. When I attach diodes 1-4, it seems to be ok, but when i attach diodes 5-8 and apply the power, then WHAMO ,! A MUR860 has caught fire or exploded or somesuch. Scary. I have tried it with lesser voltage as mains. This is with a light in between. It furnishes 52VAc but apparently is not enough for the transformer. The transformer is furnishing 38VAc into the diodes. So,,,,,where to begin ? I ordered 20 more MUR860s but they won't be here until next week. Thanks for the guidance. |
| Andy Watson:
Can you confirm that the transformer has two isolated secondaries rather than a centre tap ? There's not much else to go wrong. |
| PA0PBZ:
Did you mount the diodes isolated? The flange is connected to the cathode so if you just mount them on a heatsink the result can be 'interesting'. |
| Hextejas:
well, I dont know exactly. The xformer has 4 wires coming out of the secondary. This is it, 500va https://4donline.ihs.com/images/VipMasterCap/Capacitor/AVEL/AVELS00030/AVELS00030-1.pdf |
| Hextejas:
I dont know what you mean by isolated. I have a pcb that includes the diodes. And a question. What would happen if a diode leg was not connected at all, or if the diode was completely dead or missing ? Obviously the board would not work, but would it act like it was shorted ? Smoke and fire and scary ? |
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