I have 2 GlobeTeck RT-3s150-24 power supplies that have both failed within a few weeks of each other. Both doing the same duty, both in the same manner.
They've been train supplies, lab supplies, about anything I've needed them to do since June 2, 2005. That's the date I wrote on them when I first got them. They say they passed QC in February of 2001.
I put in an invisible dog fence wire for a lady a few weeks ago. Of course, when I was done putting in 1375 ft of wire, there was no continuity. So I made myself a tracer with an AVR processor to generate a 100KHz carrier and 2 tones I could hear with an AM radio. It had an output transistor and pullup resistor to generate enough power to hear the signal a few inches from the wire. I took one of these and my "tracer" to the lady's house and in just a few minutes found where the wire was broken. When I got home, my handy 24V 6.5A power supply would only give me 9.6V at a few mA.
"Rats. My power supply passed away."
So this weekend, the lady called back. "The lawn care people accidentally broke the wire. Can you come fix?"
I went to look, and, of course, they didn't know where. I had taken apart my "Dog Wire Tracer" to use for another project, so I built another with a tiny 10, an NFet, a 7805 regulator, 2 capacitors and a 1K resistor. I took my remaining 24V 6.5A power supply out, and in a few minutes, found the break, repaired it, buried the wire, to find no continuity, so I dug the spot up again, fixed it again... Now it's working.
But when I got home, my second 24V 6.5A power supply gives me 9.6V at only a few milliamps.
I took the cover off one of them. Nothing fried, smoked, split or burned. All the big aluminum capacitors are in place and not swollen. No smell. There's a little fuse in here... It's good.
Ok, they ARE 13 years old. Perhaps they've just expired? Anything I should check before I consign them to the dustbin?
No, the dog did not pee on it. He was outside and the power supply was on a shelf in the garage. Quite a nice dog, actually.