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Engineering
Electrical Engineering
Fried my power supply by doing a bad thing
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[QUOTE="DaveE, post: 6844206, member: 644223"] OK, if we continue the speculation that it's a shorted diode that needs replacing, then here's what I would choose: 1) The biggest diode that fits on the PCB without difficulty. It looks like maybe a DO-201 or DO-27 package to me. Those have a body of ~5mm dia. x ~9mm. Lead diameter is also important so it fits in the PCB easily. The point here is that you want it to tolerate as much abuse (power/energy) as it can while it tries to protect the circuitry upstream. Size matters for energy absorption. 2) Absolutely must have a reverse voltage rating above the maximum PS output. I wouldn't use anything below about 40V for a 30V PS, but I'd be more comfortable with 60V. Higher that that is fine but of little cost or benefit. 3) The highest forward current rating you can easily get. This probably means a Schottky diode. Something like: SB2060 - 60V, 20A, DO-201 SB10150 - 150V, 10A, DO-201 STR10100 - 100V, 10A, DO-201 4) Speed doesn't really matter. The selection tables at sites like Digikey or Mouser are your friend in this regard. If it is just a reverse diode, you can disconnect it and test the PS without it to see if that is the only problem. It has no function in normal operation. It also could be a transient suppression zener, something like 1N4755A, but I strongly doubt it. They won't work as well at reverse polarity protection, by a lot, and transient voltage protection would be better located upstream of filter elements (L's and C's at the output) with a smaller device. [/QUOTE]
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Fried my power supply by doing a bad thing
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